A preliminary list of linear collider potential projects, sorted by priority

(This list was assembled by Tom Himel and several other people, and dates from April 3, 2002. See http://www-project.slac.stanford.edu/lc/Project_List/intro.htm for an up-to-date version.)

 

ID: 35        Priority: High       project_size: Large      skill_type: Mechnical

short project description: Linac accelerator structure cooling without vibration

Detailed project description: Major decisions rest on what we do here. The quads which are near the accelerator structure must vibrate less than 10 nm. The structure vibration should be kept not too much more than that as they will be somewhat coupled. The structure must be kept at a constant (within 0.25 degree C) temperature. When the RF is on, about 6 kW per meter of power is dissipated. When the RF is off, no power is dissipated. Turbulent motion of the coolant may cause vibration. How much? Distribution of cooling water is easier (less volume to pump around) if the termperature increase is large. However, a large temperature increase could cause temperature differentials and deformation of the sturcture. Will regular water work with correct flow rate and a path which goes forward and backwards on the sturcture? Could we use heat pipes? Could we boil or evaporate water to provide the necessary cooling?

Needed by who: NLC     present status: unsolved problem     Needed by date: 6/1/2003

ContactPerson1: Andrei Seryi      WorkPhone1: 6509264805     EmailAddress1: seryi@slac.stanford.edu

ContactPerson2: Tom Himel      WorkPhone2: 6509262004      EmailAddress2: thimel@slac.stanford.edu


ID: 59        Priority: High       project_size: Large      skill_type: physicist

short project description: Structure Breakdown diagnostics

Detailed project description: Find and study new ways to monitor breakdown. Already tried are spectral, optical, xray, microwave, electron beam, acoustic emission sensors. We are trying to understand the cause of the breakdowns and how to cure them. It would help a lot to be able to localize the breakdown with a mm resolution.

Needed by who: NLC     present status: In progress, help needed     Needed by date: 8/1/2002

ContactPerson1: Marc Ross      WorkPhone1: 6509263526     EmailAddress1: mcr@slc.slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 17        Priority: High       project_size: Large      skill_type: physicist

short project description: build near final design linac girder for vibration test

Detailed project description: This is best done by a group which can provide continuuing R+D support as the girder evolves into a real RF system.

Needed by who: NLC     present status: Conceptual design     Needed by date: 6/1/2003

ContactPerson1: Tor Raubenheimer      WorkPhone1: 6509262474     EmailAddress1: tor@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 11        Priority: High       project_size: Large      skill_type: physicist

short project description: active vibration stablization of Final Doublet, maybe other places

Detailed project description: We are building a full scale prototype of the final doublets. This is mainly to see if we can keep vibration below the couple of nanometer level. There are several parts to this project, some of which are listed as separate projects. We presently have a 60 lb aluminum block that is actively stabilized. A better sensor is under development. A larger DAQ system is needed and the project must be extended to two extended (with internal modes) masses. Feedback algorithms need further development.

Needed by who: NLC     present status: In progress, help needed     Needed by date: 6/1/2003

ContactPerson1: Joe Frisch      WorkPhone1: 6509264005     EmailAddress1: frisch@slac.stanford.edu

ContactPerson2: Tom Himel      WorkPhone2: 6509262004      EmailAddress2: thimel@slac.stanford.edu


ID: 83        Priority: High       project_size: Medium      skill_type: all

short project description: Permanent magnet quadrupole

Detailed project description: Prototype a permanent quadrupole whose field can vary by 20% while the center of the field moves by less than 1 micron.

Needed by who: NLC     present status: In progress, help needed     Needed by date:  

ContactPerson1: Jim Volk      WorkPhone1: 6308402412     EmailAddress1: volk@fnal.gov

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 12        Priority: High       project_size: Medium      skill_type: Mechnical

short project description: new vibration sensor - needed soon

Detailed project description: Inertial sensor is being developed with a positon resolution of better than a nanometer down to a fraction of a Hz. A commercial sensor exists, but is too big and won't work in a magnetic field. This sensor is needed for the final doublet stablization test.

Needed by who: NLC     present status: In progress, help needed     Needed by date: 12/1/2002

ContactPerson1: Joe Frisch      WorkPhone1: 6509264005     EmailAddress1: frisch@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 6        Priority: High       project_size: Medium      skill_type: Mechnical

short project description: fake magnets for final doublet vibration test

Detailed project description: These are to mechanically simulate the final doublets for a test of the IP configuration. Mainly we will be testing for vibration

Needed by who: NLC     present status: Idea of how to do it     Needed by date: 1/1/2003

ContactPerson1: Tom Markiewicz      WorkPhone1: 6509262668     EmailAddress1:  

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 5        Priority: High       project_size: Medium      skill_type: Mechnical

short project description: carbon tube for final doublet

Detailed project description: Needed are 2 tubes each about 0.5 m in diameter and 7 m long. They serve as the support for the final doublets. They are needed early on for use in a mock-up of the final focus which will be used for vibration tests and later for actual focussing tests.

Needed by who: NLC and TESLA     present status: Idea of how to do it     Needed by date: 1/2/2003

ContactPerson1: Tom Markiewicz      WorkPhone1: 6509262668     EmailAddress1:  

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 61        Priority: High       project_size: Medium      skill_type: physicist

short project description: Acoustic sensors for structure and DLDS breakdown

Detailed project description: understand the acoustic emissions from breakdowns and how the sounds propogate so that the use of acoustic sensors can improved in diagnosing breakdowns.

Needed by who: NLC and TESLA     present status: In progress, help needed     Needed by date: 6/1/2003

ContactPerson1: Marc Ross      WorkPhone1: 6509263526     EmailAddress1: mcr@slc.slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 74        Priority: Low       project_size: Medium      skill_type: physicist

short project description: ultra-high resolution OTR beam size monitor

Detailed project description: Optical Transition Radiation (OTR) can be used to measure the size of a beam when it is passed through a material. This has been done successfully for moderate size beams. In theory, if one goes to wavelengths of light that are much smaller than the beam spot size, one should see a dip in the spacial distribution of the OTR. If this can be accomplished an accurate beam size measurement of small beams could result.

Needed by who: generic accelerator     present status: Idea of how to do it     Needed by date: 1/1/2007

ContactPerson1: Marc Ross      WorkPhone1: 6509263526     EmailAddress1: mcr@slc.slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 38        Priority: Low       project_size: Small      skill_type: Optics design

short project description: beam profile monitor via Optical Transition Radiation

Detailed project description: In low intensity beam lines (injector), and possibly at the bunch length deflector cavity, measure the beam profile on a single bunch. A prototype system (with somewhat different parameters) is operating at the ATF.

Needed by who: generic accelerator     present status: Prototype done     Needed by date: 1/1/2007

ContactPerson1: Joe Frisch      WorkPhone1: 6509264005     EmailAddress1: frisch@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 73        Priority: Low       project_size: Small      skill_type: physicist

short project description: electro-optic beam diagnostics

Detailed project description: When you pass a beam through an electro-optic material (like a pockles cell is made from) and then pass a laser through the material you can effectively measure the electric fields caused by the beam as it went through. This could be used to experimentally measure wakefields. A first prototype of this has been successfully tested at DESY.

Needed by who: generic accelerator     present status: In progress, help needed     Needed by date: 1/1/2007

ContactPerson1: Kay Wittenburg      WorkPhone1:      EmailAddress1: kay.wittenburg@desy.de

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 80        Priority: Medium       project_size: Large      skill_type: all

short project description: Very fast kickers

Detailed project description: A kicker for damping ring beam injection and extraction is needed.. For TESLA it needs to have a rise and fall time of less than 10 ns and a flat-top of 1 ns. Faster rise and fall times would allow the TESLA damping ring to shrink For NLC the rise and fall times are not very critical, but it needs a flat top of 300 ns.

Needed by who: NLC and TESLA     present status:       Needed by date:  

ContactPerson1:       WorkPhone1:      EmailAddress1:  

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 79        Priority: Medium       project_size: Large      skill_type: all

short project description: robot to replace electronic modules in tunnel

Detailed project description: Very serious consideration is being given to putting much of the electronics in shielded holes in the wall of the tunnel. To make this more palatable as far as reliability is concerned, it would help to have robots in the accelerator tunnel that could change modules. Perhaps they would travel on rails attached to the wall. For this to work will require both a good electronics enclosure and cabling design and a good robot design.

Needed by who: generic accelerator     present status: no work done     Needed by date: 1/1/2005

ContactPerson1: Marty Breidenbach      WorkPhone1: 6509262872     EmailAddress1: mib@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 31        Priority: Medium       project_size: Large      skill_type: Conceptual design

short project description: bunch length monitor via RF deflection and tomography

Detailed project description: Construct a bunch length monitor using a pulsed RF defelctor cavity. Technology has been demonstrated recently in the FFTB by Paul Emma et al, (and originally in about 1964 at SLAC by people including Rodger Miller). Work needed for beam optics design to give best measurement of rull 6d phase space. Work need on MPS issues (the deflector can drive the beam out of the pipe on a single pulse).

Needed by who: NLC and TESLA     present status: Prototype done     Needed by date:  

ContactPerson1: Joe Frisch      WorkPhone1: 6509264005     EmailAddress1: frisch@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 54        Priority: Medium       project_size: Large      skill_type: Electronics

short project description: 5-10 kW magnet power supply

Detailed project description: cheap, reliable (redundant) perhaps integrate interlocks and current readout. The idea is to put everything in one package with all the wiring run together. The temperature interlock for the coils could be a measurement of their resistance. Can this eliminate the need for a water flow interlock? Perhaps this could be an SBIR?

Needed by who: NLC and TESLA     present status: Idea of how to do it     Needed by date: 6/1/2005

ContactPerson1: Marty Breidenbach      WorkPhone1: 6509262872     EmailAddress1: mib@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 9        Priority: Medium       project_size: Large      skill_type: Mechnical / Magnetic

short project description: Final doublet permanent magnet quadrupoles

Detailed project description: Produce prototype permanent magnet quadrupoles for the final doublet. Magnet is about 2 meters long, may be in a solenoidal magnetic field. Would be used in a beam test at the SLC and would perhaps be used in the final NLC. ????For SLC test, how do we want to scale the length and strength?

Needed by who: NLC     present status: Idea of how to do it     Needed by date: 6/1/2005

ContactPerson1: Tor Raubenheimer      WorkPhone1: 6509262474     EmailAddress1: tor@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 16        Priority: Medium       project_size: Large      skill_type: physicist

short project description: superconducting quadrupole vibration test

Detailed project description: There are two options for the final doublet magnets: permanent and superconducting. The main concern about the superconducting method is that coils will vibrate too much since a strong support to the cryostat would cause a big heat leak, and boiling helium may jiggle the coils. Either by calculation, or finding an appropriate magnet, convince people that the quadrupole fields center will move by less than a nm relative to the outside of the cryostat.

Needed by who: NLC and TESLA     present status: good idea needed     Needed by date: 6/1/2005

ContactPerson1: Joe Frisch      WorkPhone1: 6509264005     EmailAddress1: frisch@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 75        Priority: Medium       project_size: Large      skill_type: physicist

short project description: Ultra-high resolution beam size monitor

Detailed project description: Needed at the Interaction point to measure 2 nm spot size. Idea needed. Can use beam-beam deflection to measure the quadruture sum of the two beam sizes, but would be nice to have an individual beam measurement

Needed by who: NLC and TESLA     present status: no idea     Needed by date: 1/1/2007

ContactPerson1: Marc Ross      WorkPhone1: 6509263526     EmailAddress1: mcr@slc.slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 20        Priority: Medium       project_size: Large      skill_type: physicist

short project description: test production of polarized positrons

Detailed project description: Basic idea is to generate about 10 MeV gammas which then hit a target to generate positrons. The gamma source may be an electron beam going through an undulator (TESLA design and a test of this is being considered at SLAC), or a laser backscattered off and electron beam (test being done at KEK). The goal for the prototype test is to check the production rate and degree of polarization and to develop the instrumentation needed to measure the polarization of the 10-20 MeV positrons. Full intensity in not required.

Needed by who: NLC and TESLA     present status: Idea of how to do it     Needed by date: 6/1/2005

ContactPerson1: Rainer Pitthan      WorkPhone1: 6509263467     EmailAddress1: rainer@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 85        Priority: Medium       project_size: Large      skill_type: physicist

short project description: Polarized Source Laser for NLC

Detailed project description: Construct a prototype source laser capable of producing the required pulse structure (~200 pulses at 714MHz), at 120Hz 200-700ps pulse length (adjustable), 780-880nm wavelength (adjustable). 30uJ/micropulse, ~0.1% intensity stability

Needed by who: NLC     present status: Conceptual design     Needed by date:  

ContactPerson1: Joe Frisch      WorkPhone1: 6509264005     EmailAddress1: frisch@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 88        Priority: Medium       project_size: medium      skill_type: accelerator physics

short project description: Pre-Linac collimation design

Detailed project description: Collimation of the beam tails before the linac is needed. The design has not received as much attention as the downstream collimation design.

Needed by who: NLC and TESLA     present status:       Needed by date:  

ContactPerson1: Nick Walker      WorkPhone1:      EmailAddress1: nicholas.walker@desy.de

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 27        Priority: Medium       project_size: Medium      skill_type: alignment

short project description: conventional alignment plan

Detailed project description: Develop an accurate, efficient way to place the components in the tunnel with an accuracy of 100 microns.

Needed by who: NLC and TESLA     present status: Conceptual design     Needed by date: 6/1/2005

ContactPerson1: Robert Ruland      WorkPhone1: 6509263468     EmailAddress1: ruland@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 42        Priority: Medium       project_size: Medium      skill_type: Conceptual design

short project description: high power RF switch

Detailed project description: The ability to switch high power (few hundred MW) pulsed RF would substantailly reduce the complexity of the NLC RF distribution / compression system. There are a few concepts, but no practical demonstration has been done.

Needed by who: NLC     present status: Idea of how to do it     Needed by date: 6/1/2002

ContactPerson1: Sami Tantawi      WorkPhone1: 6509264454     EmailAddress1: tantawi@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 21        Priority: Medium       project_size: Medium      skill_type: Electronics

short project description: Interaction Point Intra train beam-beam deflection feedback

Detailed project description: Each accelerator pulse is a train of many bunches. For NLC there are 192 bunches spaced 1.4 ns apart. For TESLA there are 2820 bunches with a 337 ns spacing. This feedback uses the beam-beam deflection of the first bunch to measure the amount by which the beams miss. It then makes a correction as fast as possible for subsequent bunches. This repeats for later bunches in the train. The shorter bunch spacing makes this harder for NLC than for TESLA. The lower pulse rate of TESLA makes this absolutely essential to obtain luminosity. For NLC it acts as insurance.

Needed by who: NLC and TESLA     present status: In progress, help needed     Needed by date: 6/1/2005

ContactPerson1: Steve Smith      WorkPhone1: 6509263916     EmailAddress1: ssmith@slac.stanford.edu

ContactPerson2: Phil Burrows      WorkPhone2: 6509262683      EmailAddress2: p.burrows1@physics.oxford.ac.uk


ID: 3        Priority: Medium       project_size: Medium      skill_type: Electronics

short project description: RF BPM electronics, including tilt

Detailed project description: Reads out a small RF x band cavity. Gives a position that must have a precision of 1 micron and a drift of less than 1 microns per day. We think that by using the quadrature signal from the BPM that the tilt from the front to the back of the beam (x-z and y-z correlations) can be measured. Critical issue: Center stability Closely coupled to #1 RF bpm mechanical Combined with #2 makes a GOOD, but large project

Needed by who: generic accelerator     present status: Idea of how to do it     Needed by date: 6/1/2005

ContactPerson1: Steve Smith      WorkPhone1: 6509263916     EmailAddress1: ssmith@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 34        Priority: Medium       project_size: Medium      skill_type: Electronics

short project description: crab cavity phase control

Detailed project description: Final focus crab cavities require phase matching on S-band deflection cavities to <0.1 degree . First stage is a low power simulation. Second stage requires a klystron and high power cavities. System is not expected to be a technical problem, but is critical for NLC operation .

Needed by who: NLC     present status: Conceptual design     Needed by date: 1/1/2005

ContactPerson1: Joe Frisch      WorkPhone1: 6509264005     EmailAddress1: frisch@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 22        Priority: Medium       project_size: Medium      skill_type: Electronics

short project description: linac intratrain steering feedback including fast BPM electronics

Detailed project description: This is a steering feedback in the linac which corrects each individual bunch in a train. It assumes that the transverse shape of a train will be nearly constant from one pulse to the next. It records all the bunch positions on one pulse and applies the appropriate correction on the subsequent pulses. The high bandwidth required because of the short NLC bunch spacing is what makes this challenging. This particularly applies to the BPM readout

Needed by who: NLC     present status: Idea of how to do it     Needed by date: 6/1/2005

ContactPerson1: Steve Smith      WorkPhone1: 6509263916     EmailAddress1: ssmith@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 4        Priority: Medium       project_size: Medium      skill_type: Laser / optical

short project description: laser oscillator for source

Detailed project description: This is the oscillator for the polarized source laser. 714MHz repetition rate, 750-880nm wavelenth, picosecond laser. In the existing source laser design, the pulse will be spectrally shaped, then temporally dispersed to produce the required pulse temporal structure (300-700ps adjustable pulse width, square). Alternate overall source laser designs many exist, eliminating the need for this project High frequency mode locked lasers are of interest to industry.

Needed by who: NLC     present status: Conceptual design     Needed by date: 6/1/2005

ContactPerson1: Joe Frisch      WorkPhone1: 6509264005     EmailAddress1: frisch@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 1        Priority: Medium       project_size: Medium      skill_type: Mechnical

short project description: RF BPM mechnical

Detailed project description: These BPMs are located in each quadrupole Strongly coupled to #2 BPM electronics. Critical issue: Mechanical vs electrical center stabilitiy. For a BPM with a 6 mm radius, the long term (days) center stability needs to be about 1 micron. Combined with #2 makes a GOOD large but separable project.

Needed by who: generic accelerator     present status: Idea of how to do it     Needed by date: 6/1/2004

ContactPerson1: Steve Smith      WorkPhone1: 6509263916     EmailAddress1: ssmith@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 15        Priority: Medium       project_size: Medium      skill_type: mechnical and RF

short project description: high power RF vacuum valves

Detailed project description: The pulse compression system for NLC has many kilometers of interconnected RF waveguides that are under vacuum. If an RF vacuum valve existed, they could be placed periodically in the waveguides and used to isolate vacuum leaks. This would aid greatly in locating vacuum leaks.

Needed by who: NLC     present status: idea needed     Needed by date: 6/1/2005

ContactPerson1: Sami Tantawi      WorkPhone1: 6509264454     EmailAddress1: tantawi@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 64        Priority: Medium       project_size: Medium      skill_type: physicist

short project description: Electron cloud diagnostics

Detailed project description: The electron cloud limits the current in positron damping rings. A good way to measure the electron cloud density as a function of s would help in understanding the problem. Develop such a sensor. This is problem for present accelerators and will be for NLC and TESLA.

Needed by who: generic accelerator     present status: Idea of how to do it??     Needed by date: 1/1/2004

ContactPerson1: John Seeman      WorkPhone1: 6509263566     EmailAddress1: seeman@slac.stanford.edu

ContactPerson2: Marc Ross      WorkPhone2: 6509263526      EmailAddress2: mcr@slc.slac.stanford.edu


ID: 13        Priority: Medium       project_size: Medium      skill_type: physicist

short project description: new cryogenic vibration sensor

Detailed project description: If we use a super conducting final doublet (the preferred solution if we can make it work), it is the mass in the cryostat which must be stablized. This inertial sensor imust have a positon resolution of better than a nanometer down to a fraction of a Hz. A commercial sensor exists, but is too big and won't work in a magnetic field and works only at room temperature.

Needed by who: NLC     present status: Idea of how to do it     Needed by date: 6/1/2005

ContactPerson1: Joe Frisch      WorkPhone1: 6509264005     EmailAddress1: frisch@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 84        Priority: Medium       project_size: Medium      skill_type: physicist

short project description: Make absolute measurement of RF power

Detailed project description: Making relative measurements of RF power is fairly easy. Making an absolute measurement of high RF power is more difficult. A way to do this needs to be developed. An accuracy of ???1% is desired.

Needed by who: generic accelerator     present status:       Needed by date:  

ContactPerson1:       WorkPhone1:      EmailAddress1:  

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 58        Priority: Medium       project_size: medium      skill_type: physicist

short project description: e+ e- pair monitor

Detailed project description:  

Needed by who:       present status:       Needed by date:  

ContactPerson1: Tom Markiewicz      WorkPhone1: 6509262668     EmailAddress1:  

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 33        Priority: Medium       project_size: Medium      skill_type: physicist

short project description: bunch length monitor via spectral measurement

Detailed project description: Measure the micor wave / millimeter wave output from a beam pickup. Alternate - look at correlations in the optical spectrum of the synchrotron radiation. Need to determine if either technology will work with LC bunch lengths. System would be much smaller than the deflection cavity measurement, and could be used in multiple places.

Needed by who: generic accelerator     present status: Idea of how to do it     Needed by date: 1/1/2005

ContactPerson1: Joe Frisch      WorkPhone1: 6509264005     EmailAddress1: frisch@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 89        Priority: Medium       project_size: medium      skill_type: physicist

short project description: Damping ring wiggler prototyping and test

Detailed project description: The damping ring wigglers need to be prototyped and the magnetic field accurately measured. The field must be of very high quality. Present designs call for permanent magnet wigglers, but superconducting wigglers are an option.

Needed by who: NLC and TESLA     present status:       Needed by date:  

ContactPerson1: Andy Wolski      WorkPhone1: 5104866549     EmailAddress1: AWolski@lbl.gov

ContactPerson2: Markus Tischer      WorkPhone2:       EmailAddress2: markus.tischer@desy.de>


ID: 63        Priority: Medium       project_size: medium      skill_type: physicist

short project description: Solid state physics associated with breakdown

Detailed project description: An understanding of this may help us get to higher gradient. Surface contamination. Sub surface contamination, gas evolution from grain boundaries, surface defects etc are possible causes.

Needed by who:       present status:       Needed by date:  

ContactPerson1: Perry Wilson      WorkPhone1: 6509263163     EmailAddress1:  

ContactPerson2: Marc Ross      WorkPhone2: 6509263526      EmailAddress2: mcr@slc.slac.stanford.edu


ID: 65        Priority: Medium       project_size: Medium      skill_type: physicist

short project description: Optical Diffraction Radiation

Detailed project description: Similar to optical transition radiation, but instead of passing the beam through the material, it passes very close to the edge. Light has been seen. In theory, it could be imaged and the beam size. Make this happen.

Needed by who: generic accelerator     present status: Idea of how to do it     Needed by date: 1/1/2006

ContactPerson1: Marc Ross      WorkPhone1: 6509263526     EmailAddress1: mcr@slc.slac.stanford.edu

ContactPerson2: Michele Castellano      WorkPhone2:       EmailAddress2: michele.castellano@lnf.infn.it


ID: 68        Priority: Medium       project_size: Medium      skill_type: physicist

short project description: positron target lifetime improvement

Detailed project description: This is relevant to the positron target. It receives so much radiation that it effects the material and leads to failure. The SLC target failed after several years of use. The failure mode is not fully understood, it may be from the thermal shocks and/or from radiation damage. An understanding of this could lead to a better target material.

Needed by who: NLC     present status: Idea of how to do it     Needed by date: 1/1/2006

ContactPerson1: John Sheppard      WorkPhone1: 6509263498     EmailAddress1: jcs@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 69        Priority: Medium       project_size: Medium      skill_type: physicist

short project description: Increase Radiation hardness of technological materials

Detailed project description: Losts of stuff will be in the accelerator tunnel exposed to radiation. How much Gallium Arsenite Mixers Lasers Camera lenses. Plastic cable insulation

Needed by who: generic accelerator     present status:       Needed by date: 1/1/2006

ContactPerson1: Marc Ross      WorkPhone1: 6509263526     EmailAddress1: mcr@slc.slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 71        Priority: Medium       project_size: Medium      skill_type: physicist

short project description: Single pulse damage from a small electron beam

Detailed project description: It has been measured that a single bunch of 0.6 E10 electrons with a 6 micron radius blows a hole in a thin copper foil. The exact mechanism is not understood. It is unknown how thick an object must be before the beam does not make a hole. Will the first errant pulse in NLC or TESLA cause a vacuum leak?

Needed by who: NLC and TESLA     present status: Idea of how to do it     Needed by date: 1/1/2005

ContactPerson1: Marc Ross      WorkPhone1: 6509263526     EmailAddress1: mcr@slc.slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 62        Priority: Medium       project_size: Medium      skill_type: physicist

short project description: Dark current and its relation to breakdown

Detailed project description: Understand the mechanism of darrk current in accelerator structures and how processing effects it. It is needed for NLC and TESLA, but the requirements are different for the two.

Needed by who: NLC and TESLA     present status: Conceptual design     Needed by date: 1/1/2004

ContactPerson1: Chris Adolphsen      WorkPhone1: 6509263560     EmailAddress1: star@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 18        Priority: Medium       project_size: Medium      skill_type: software

short project description: Generic distributed fast (kHz) feedback for Damping Ring steer or vib

Detailed project description: This is a software / hardware project. "very" fast distributed feedback (120Hz > speed < 10KHz) is required for damping ring control, and possibly vibration stabilization. Existing hardware systems (typically reflective memory in VME) may be extendable, or an entirely new system may be required.

Needed by who: generic accelerator     present status: Idea of how to do it     Needed by date: 1/1/2006

ContactPerson1: Joe Frisch      WorkPhone1: 6509264005     EmailAddress1: frisch@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 72        Priority: Medium       project_size: Medium      skill_type: vacuum

short project description: Obtain vacuum of 1e-12 Torr for polarized RF gun

Detailed project description: Presently polarized electrons are presently made from a diode photo-injector. There is a DC field on the photo-cathode. Higher quality beams can be produced with an RF gun. Unfortunately, the delicate high polarization photo-cathodes are destroyed by the gas in the RF gun. It is believed that achieving a vacuum of 1e-12 Torr in the gun would cure this problem.

Needed by who: NLC and TESLA     present status:       Needed by date: 1/1/2005

ContactPerson1:       WorkPhone1:      EmailAddress1:  

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 57        Priority: Medium       project_size: Small      skill_type: Conceptual design

short project description: Monitor of Luminosity as function of beam energy

Detailed project description: Use beamstrahlung spectrum?

Needed by who: NLC and TESLA     present status:       Needed by date: 1/1/2005

ContactPerson1: Tom Markiewicz      WorkPhone1: 6509262668     EmailAddress1:  

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 78        Priority: Medium       project_size: Small      skill_type: Conceptual design

short project description: Remediation of tritiated ground water

Detailed project description: At high beam loss points (dumps) there is very high radiation. Some of that will make it into the ground and ground water and make tritium. This water cannot be allowed to escape the premises. Figure out how to prevent it.

Needed by who: generic accelerator     present status: Idea of how to do it     Needed by date: 1/1/2005

ContactPerson1: Sayed Rokni      WorkPhone1: 6509263544     EmailAddress1: rokni@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 56        Priority: Medium       project_size: Small      skill_type: Conceptual design

short project description: Luminosity monitor: Get good measurement on each pulse

Detailed project description: Should be able to get a good measurement on each bunch, or at least on each pulse. This will be VERY useful for optimizing the NLC luminosity. There are several physics processes which could be used. For the accelerator, an absolute calibration is not needed. Just a design is needed for now

Needed by who: NLC and TESLA     present status: Idea of how to do it     Needed by date: 1/1/2005

ContactPerson1: Tom Markiewicz      WorkPhone1: 6509262668     EmailAddress1:  

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 47        Priority: Medium       project_size: Small      skill_type: mechnical + optics

short project description: energy spectrometer

Detailed project description: The beam energy will be used in finding the mass of particles which are found, so an accurate absolute measurement is important. Design an energy spectrometer that will be downstream of the IP to measure the beam energy. This was done at the SLC using synchrotron radiation to measure how far the beam turned in a calibrated bend magnet. Perhaps the same technique can be adapted for the LC, perhaps a new method will be developed.

Needed by who: NLC and TESLA     present status: Idea of how to do it     Needed by date: 1/1/2005

ContactPerson1: Marc Ross      WorkPhone1: 6509263526     EmailAddress1: mcr@slc.slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 41        Priority: Medium       project_size: Small      skill_type: physicist

short project description: flow switch replacement

Detailed project description: High reliability, cheap, rad-hard flow switch. Should not trip when a bubble goes by, should not be the smallest aperature in the system so that it gets plugged up. Should both have a trip point and a flow readout so lmarginal flow can be detected before it causes a trip. Possible SBIR?

Needed by who: generic accelerator     present status: no work done     Needed by date: 1/1/2006

ContactPerson1: Marty Breidenbach      WorkPhone1: 6509262872     EmailAddress1: mib@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 70        Priority: Medium       project_size: Small      skill_type: physicist

short project description: Neutron monitoring for extrapolating doses

Detailed project description: Multi MeV neutrons damage materials in an accelerator. Develop a real time measure of the neutron dose.

Needed by who: generic accelerator     present status: no ideas     Needed by date: 1/1/2006

ContactPerson1: Marc Ross      WorkPhone1: 6509263526     EmailAddress1: mcr@slc.slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 76        Priority: Medium       project_size: Small      skill_type: physicist

short project description: beam halo monitors

Detailed project description: Typically a tiny tail of the beam containing perhaps on 1 in 1e8 of the beam particles is responsible for making much of the detector background either by hitting something and showering into the detector or being at a large radius, seeing high fields and emitting synchrotorn radiation which enters the detector. Conventional beam size monitors are not sensitive to these tails. A beam halo monitor would be. Figure out how to do this.

Needed by who: generic accelerator     present status: Idea of how to do it     Needed by date: 1/1/2005

ContactPerson1: Marc Ross      WorkPhone1: 6509263526     EmailAddress1: mcr@slc.slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 90        Priority: Medium-High       project_size: large      skill_type: physicist

short project description: Surface treatments for structures and cavities

Detailed project description: Surface treatments to suppress field emission and raise the breakdown and quench (SC case) gradient need investigation. These might include high pressure rinsing, etching, gettering, electropolishing, and baking. These are of interest for both warm and cold structures/cavities.

Needed by who: NLC and TESLA     present status:       Needed by date:  

ContactPerson1: Hasan Padamsee      WorkPhone1: 6072555727     EmailAddress1: hsp3@cornell.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 86        Priority: Medium-High       project_size: medium      skill_type: physicist

short project description: Simulations of dark current transport

Detailed project description: Much of the background produced by the SLC came from a beam halo of unknown origin. This halo may have been due, in part, to dark current from the linac transported all the way to the IP. Dark current transport also has implications for diagnostic devices.

Needed by who: NLC and TESLA     present status:       Needed by date:  

ContactPerson1: Hans Braun      WorkPhone1:      EmailAddress1: Hans.Braun@cern.ch

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 77        Priority: Medium-High       project_size: Medium      skill_type: physicist

short project description: single pass beam size monitors

Detailed project description: Ideas: Ionization beam size monitor gradient undulator (an undulator made of quadrupoles). Synchrotron radiation output will be proportional to the beam size. There is a paper on this. Ideally this monitor would measure the density distribution of the beam in a single pass. The above monitors measure some kind of average radius.

Needed by who: generic accelerator     present status: needs new idea     Needed by date: 1/1/2004

ContactPerson1: Marc Ross      WorkPhone1: 6509263526     EmailAddress1: mcr@slc.slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 29        Priority: Medium-Low       project_size: Large      skill_type: physicist

short project description: laser wire beam size monitor

Detailed project description: A laser spot must be scanned across the electron beam and the rate of scattered electrons or gammas measured. This is used to measure the spot size in the linac. The typical beam spot size is about 12 microns. It is a bonus if the laser can scan fast enough and the recording electronics is fast enough to do a scan all in a single bunch train (192 bunches with 1.4 ns spacing for NLC and 2000 bunches with 300 ns spacing for TESLA). Any other way to nondisruptively measure the spot size is welcome. Note a laser wire beam size monitor was built and used at the SLC. However laser wire design is rather specific to the beam parameters. SLC laser wire was constrained by the detector and was not designed the way a linac laser wire would be designed. Can probably just build a prototype. Design is fairly obvious once the beam parameters are set

Needed by who: generic accelerator     present status: Conceptual design     Needed by date: 1/1/2006

ContactPerson1: Marc Ross      WorkPhone1: 6509263526     EmailAddress1: mcr@slc.slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 10        Priority: Medium-Low       project_size: Medium      skill_type: Monte Carlo

short project description: Background Calculation and Reduction in the IR.

Detailed project description: There are many types of backgrounds: Halo muons, low energy e+e- pairs, synchrotron radiation. Use existing simulation tools (and perhaps write new ones) to calculate the background levels and to design shielding and masks to minimize it.

Needed by who: NLC and TESLA     present status: In progress, help needed     Needed by date: 6/1/2005

ContactPerson1: Tom Markiewicz      WorkPhone1: 6509262668     EmailAddress1:  

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 14        Priority: Medium-Low       project_size: Medium      skill_type: physicist

short project description: Damping Ring beam size monitor

Detailed project description: The beam height in the damping ring will be about 4 microns. We need to nondisruptively measure this on an individual turn in the ring. Traditionally this is done with a synchrotron light monitor. The spot here is so small that one must go to very short (x-ray) wavelengths to get the necessary resolution. We would like a conceptual design of some way to do this. It would then be evaluated whether a prototype is needed

Needed by who: generic accelerator     present status: need good idea     Needed by date: 6/1/2005

ContactPerson1: Marc Ross      WorkPhone1: 6509263526     EmailAddress1: mcr@slc.slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 50        Priority: Medium-Low       project_size: medium      skill_type: physicist

short project description: polarization measurement in linac ?

Detailed project description: Could be included in laser wire systems.

Needed by who:       present status:       Needed by date:  

ContactPerson1: Mike Woods      WorkPhone1: 6509263609     EmailAddress1: mwoods@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 87        Priority: Medium-Low       project_size: medium      skill_type: physicist

short project description: Wire measurements of structure impedances

Detailed project description: When structures go into mass production, it will not be possible to evaluate wake field impedances with beam. A bench test using a wire running down the structure center would be desirable

Needed by who:       present status:       Needed by date:  

ContactPerson1: Nicoleta Baboi      WorkPhone1: 6509268602     EmailAddress1: nicoleta@SLAC.Stanford.EDU

ContactPerson2: Rojer Jones      WorkPhone2: 6509262309      EmailAddress2: rmj@SLAC.Stanford.EDU


ID: 52        Priority: Medium-Low       project_size: medium      skill_type: physicist

short project description: polarization measurement upstream of the IP

Detailed project description: Will this cause too much background?

Needed by who:       present status:       Needed by date:  

ContactPerson1: Mike Woods      WorkPhone1: 6509263609     EmailAddress1: mwoods@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 49        Priority: Medium-Low       project_size: medium      skill_type: physicist

short project description: polarization measurement in Damping Ring

Detailed project description: Compton backscatter, and synchrotron radiation asymmetry have been considered, but no real work done.

Needed by who:       present status: Idea of how to do it     Needed by date:  

ContactPerson1: Mike Woods      WorkPhone1: 6509263609     EmailAddress1: mwoods@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 51        Priority: Medium-Low       project_size: medium      skill_type: physicist

short project description: polarization measurement downstream of the IP

Detailed project description:  

Needed by who:       present status:       Needed by date:  

ContactPerson1: Mike Woods      WorkPhone1: 6509263609     EmailAddress1: mwoods@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 53        Priority: Medium-Low       project_size: Small      skill_type: Electronics

short project description: Fast MPS communications to check pulsed devices

Detailed project description: Part of the Machine Protection System must check that all pulsed devices (modulators and kickers) are ready to fire just before the particles are extracted from the damping rings. If too many things aren't ready (a few bad modulators may be OK) then extraction is aborted. This must be very fast (speed of light should account for most of the delay), so simple logic and wires or fibers must be used. Design such a system to be highly reliable and have necessary diagnostics and readout of what caused the fault. Only a conceptual design is needed at this point.

Needed by who: NLC and TESLA     present status: Idea of how to do it     Needed by date: 1/1/2007

ContactPerson1: Marc Ross      WorkPhone1: 6509263526     EmailAddress1: mcr@slc.slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 39        Priority: Medium-Low       project_size: Small      skill_type: Electronics

short project description: magnet interlocks - ground faults, temperature, reliability

Detailed project description: Many ways have been used in the past to interlock magnet power supplies to protect the magnet. Making them cheaper and more reliable with fewer cables would be a considerable advance. For starters, just a conceptual design needs to be developed. Depending on what it is, prototyping may be necessary. One idea out there is to measure a magnets temperature by measuring the resistance of each coil. Others are wecome

Needed by who: generic accelerator     present status:       Needed by date: 1/1/2006

ContactPerson1: Marty Breidenbach      WorkPhone1: 6509262872     EmailAddress1: mib@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 46        Priority: Medium-Low       project_size: Small      skill_type: Electronics

short project description: Programable Delay Unit

Detailed project description: A count down timer (similar to the SLAC PDU), but with more flexability, and operating at 714MHz is required. This is a "pure" electronics design problem. A low speed prototype can be constructed in a Xilinx (or similar), but a semi-custom ASIC (possibly a gate array) will be needed for the final version. NLC will require thousands of 16-channel units. Evolving commercial technology will be an issue.

Needed by who: generic accelerator     present status: Idea of how to do it     Needed by date: 1/1/2006

ContactPerson1: Joe Frisch      WorkPhone1: 6509264005     EmailAddress1: frisch@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 91        Priority: Medium-Low       project_size: small      skill_type: physicist

short project description: Effect of detector solenoid on luminosity

Detailed project description: Beams going off-axis through the detector solenoid fringe field and central field experience an emittance growth due to synchrotron radiation photon emission. This can result in a lower luminosity. This is of concern for NLC, which uses a crossing angle. The problem can be solved through appropriate shaping of the solenoid fringe field, which has an impact on the detector

Needed by who: NLC     present status:       Needed by date:  

ContactPerson1:  Daniel Schulte      WorkPhone1:      EmailAddress1:  Daniel.Schulte@cern.ch

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 19        Priority: Medium-High       project_size: Large      skill_type: Electronics

short project description: new electronics standard - VME replacement

Detailed project description: We may put electronics into holes in the wall to minimize the cable runs. This needs packaging design, cooling, serial communications standard, cable routing and connection design etc. This is a very large project. The new standard must be accepted and supported by a range of laboratories to be effective. Without this system, the electronics cost for NLC will be very substantially higher, possibly $100M or more.

Needed by who: generic accelerator     present status: no work done     Needed by date: 6/1/2004

ContactPerson1: Ray Larsen      WorkPhone1: 6509264907     EmailAddress1: larsen@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 81        Priority: Medium-High       project_size: Large      skill_type: Mechnical/cryo

short project description: Dynamic tuners for superconducting cavities, e.g. piezoelectric tuners

Detailed project description: Lorentz forces distort the shape of the superconducting RF cavities causing their resonant frequency to change. This must be corrected by applying a force which varies during the 6 ms RF pulse in order to stabilize the resonant frequency.

Needed by who: TESLA     present status: In progress, help needed     Needed by date:  

ContactPerson1: Ruben Carcagno      WorkPhone1: 6308403915     EmailAddress1: ruben@fnal.gov

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 82        Priority: Medium-High       project_size: Medium      skill_type: all

short project description: Measure quadrupole field center to 1 micron

Detailed project description: Measure the center of a quadrupole field with a stability of better than 1 micron over a period of several minutes. This will be used to test whether the center moves as the field is varied.

Needed by who: NLC     present status: Prototype done     Needed by date:  

ContactPerson1: Jim Volk      WorkPhone1: 6308402412     EmailAddress1: volk@fnal.gov

ContactPerson2: Cherrill Spencer      WorkPhone2: 6509263474      EmailAddress2: cherrill@slac.stanford.edu


ID: 43        Priority: Medium-High       project_size: Medium      skill_type: Conceptual design

short project description: vacuum leak detector that localizes leak in km of pipe without valves

Detailed project description: DLDS has a very large connected volume (unless high power RF vacuum valves are designed). A system for leak checking a large (Kilometer scale) vacuum system is needed).

Needed by who: NLC     present status:       Needed by date:  

ContactPerson1:       WorkPhone1:      EmailAddress1:  

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 26        Priority: Medium-High       project_size: Medium      skill_type: Electronics

short project description:  Low Level RF 500 MHz DAC

Detailed project description: The present LLRF system assumes a ~500Ms/s arbitrary waveform generator (AWG) producing a digital IF which is used to modulat the X-band RF drive. (Note, that various combinations of IF frequency, and mixing schemes are under discussion). Conventional AWG cards are too expensive. Will need a large number of channels (thousands). This is a GOOD separable project.

Needed by who: NLC     present status: Idea of how to do it     Needed by date: 1/1/2004

ContactPerson1: Marty Breidenbach      WorkPhone1: 6509262872     EmailAddress1: mib@slac.stanford.edu

ContactPerson2: Steve Smith      WorkPhone2: 6509263916      EmailAddress2: ssmith@slac.stanford.edu


ID: 28        Priority: Medium-High       project_size: Medium      skill_type: Electronics

short project description: Vacuum pump HV and control

Detailed project description: There is a major decision to be made. Should the vacuum pump HV supply and control and readout be right on the pump where it must be quite radiation hard, or must we make it remote at the expense of long cables. This project is to develop a rad hard vacuum HV and control that only has cables for power and serial communication. Note, analog communication may be OK.

Needed by who: NLC and TESLA     present status: Idea of how to do it     Needed by date: 1/1/2004

ContactPerson1: Marty Breidenbach      WorkPhone1: 6509262872     EmailAddress1: mib@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 25        Priority: Medium-High       project_size: Medium      skill_type: Electronics

short project description:  Low Level RF 500 MHz digitizer

Detailed project description: There are many channels of this, so it must be CHEAP.: $100 per channel instead of the present $10,000. One idea is to develop an analog waveform recording chip and then do the digitizing more slowly after the pulse has gone by. The present RF system down-mixes the RF signals from the structures and diagnostics to an IF in the ~100-500MHz range. This must be digitized at ~500MHz, for the length of the RF pulse (up to 3.2 microseconds), at 12 bits (possibly 8 is ok?). Commercial digitizer cards are too expensive. May use custom sampling chip? Will need a large number of channels (thousands) Commercial technology will evolve. May need to be rad resistant if mounted in tunnel. (Will have some shielding). Without this, need to redesign low level RF technology.

Needed by who: NLC     present status: Idea of how to do it     Needed by date: 1/1/2004

ContactPerson1: Marty Breidenbach      WorkPhone1: 6509262872     EmailAddress1: mib@slac.stanford.edu

ContactPerson2: Steve Smith      WorkPhone2: 6509263916      EmailAddress2: ssmith@slac.stanford.edu


ID: 44        Priority: Medium-High       project_size: Medium      skill_type: Electronics

short project description: RF and beam phase monitor x band to 1 degree

Detailed project description: The RF phase must be adjusted relative to the electron beam phase to approximately 1 degree. The beam induces RF fields in the accelerator structures. The phase of these fields can be measured relative to the main RF to provide phase information. Method 1: Turn off the main RF for a pulse and measure the induced fields from the electron beam. This has been tested in an S-band prototype. Method 2: Measure the small (.01 degree) change in the RF transmitted through the structure due to the beam fields. This works on paper, but has not been demonstrated.

Needed by who: NLC     present status: In progress, help needed     Needed by date: 1/1/2004

ContactPerson1: Steve Smith      WorkPhone1: 6509263916     EmailAddress1: ssmith@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 30        Priority: Medium-High       project_size: Medium      skill_type: materials science

short project description: Damping Ring electron cloud remediation

Detailed project description: In the positron damping ring, the current may be limitted by an electron cloud. These electrons are knocked of the beam pipe walls by synchrotron radiation photons or electrons from the cloud. This problem can be reduced by putting a coating on the beam pipe to reduce the electron emission coefficient. Often used is TiN. Experiment to find other coatings which work still better.

Needed by who: NLC and TESLA     present status: unsolved problem     Needed by date: 6/1/2004

ContactPerson1: Ed Garwin      WorkPhone1: 6509262415     EmailAddress1: garwin@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 8        Priority: Medium-High       project_size: Medium      skill_type: Mechnical

short project description: Final Doublet movers: 10 nm step, low vibration, rad hard

Detailed project description: May be similar to the linac movers, but needs smaller step size. Also is more important that it doesn't amplify vibrations. Must be rad hard. Must work in a magnetic field. This makes a GOOD project, which requires close coordination with other final focus girder work.

Needed by who: NLC and TESLA     present status: Idea of how to do it     Needed by date: 6/1/2004

ContactPerson1: Gordon Bowden      WorkPhone1: 6509262991     EmailAddress1: gbb@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 7        Priority: Medium-High       project_size: Medium      skill_type: Mechnical

short project description: linac movers: 50 nm step, rad hard

Detailed project description: Every magnet and structure girder in the linac sits on movers to allow it to be accurately positioned. Movers will typically be adjusted every fiew minutes to hours. A step size of 50 nm is needed along with a range of 1 mm. It is important to have a high quality, reliable, cheap system for this. Movers that meet these specs except for stepsize have been used in the FFTB. It would be nice to get rid of the stepping motors Large number of movers makes cost reduction important. This makes a GOOD separable project.

Needed by who: generic accelerator     present status: inadequate prototype built     Needed by date: 6/1/2004

ContactPerson1: Gordon Bowden      WorkPhone1: 6509262991     EmailAddress1: gbb@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2:  


ID: 60        Priority: Medium-High       project_size: Medium      skill_type: physicist

short project description: X-ray imagers of DLDS

Detailed project description: DLDS is the pulse compression for NLC. Develop x-ray monitors for studying potential DLDS problems. These should be used to localize and characterize breakdowns and sources of radiation.

Needed by who: NLC     present status: Conceptual design     Needed by date: 1/1/2004

ContactPerson1: Sami Tantawi      WorkPhone1: 6509264454     EmailAddress1: tantawi@slac.stanford.edu

ContactPerson2: Marc Ross      WorkPhone2: 6509263526      EmailAddress2: mcr@slc.slac.stanford.edu


ID: 55        Priority: Medium-High       project_size: Medium      skill_type: physicist

short project description: ground motion studies vs depth

Detailed project description: Ground motion causing the magnets to vibrate can be a problem for both NLC and TESLA. Much has been studied already, but more tests are still needed. In particular knowing how the ground motion varies with depth will help in the decision on how deep the tunnel should be.

Needed by who: NLC and TESLA     present status: In progress, help needed     Needed by date: 1/1/2004

ContactPerson1: Vladimir Shiltsev      WorkPhone1: 6308405241     EmailAddress1: shiltsev@fnal.gov

ContactPerson2: Andrei Seryi      WorkPhone2: 6509264805      EmailAddress2: seryi@slac.stanford.edu


ID: 24        Priority: Medium-High       project_size: Small      skill_type: Electronics

short project description:  Low Level RF front end

Detailed project description: This is the part of the low-level RF system that goes in the tunnel right next to the linac. The main function is to mix signals down to a frequency than can be handled digitally. It must be rad hard. This system is based on the model where a small amout of electronics is mounted on the girder to reduce the high frequency cable plant, and the majority of the electronics is in either tunnel enclosures, or outside of the tunnel. The front end electronics mixes the X-band RF signals (Structure, and Structure BPM) to an IF (probably 100-500MHz). These signals are then transmitted through small cable (possibly CAT7, or frequency multiplexed on Heliax, or multiple small RF coax) to the digitizer modules. Electronics must be Rad-hard, and meet stability and linearity specs.

Needed by who: NLC     present status: Conceptual design     Needed by date: 1/1/2004

ContactPerson1: Steve Smith      WorkPhone1: 6509263916     EmailAddress1: ssmith@slac.stanford.edu

ContactPerson2:       WorkPhone2:       EmailAddress2: