Summary of Accelerator R&D David Finley / Fermilab Linear Collider Retreat / Santa Cruz CA June 29, 2002 Morning Tal

Summary of Accelerator R&D David Finley / Fermilab Linear Collider Retreat / Santa Cruz CA June 29, 2002 • Morning Talks • Afternoon 5 Minute Talks • Lists David Finley to LC Retreat / Santa Cruz CA

Permanent MagnetsJim Volk / Fermilab • Useful for Damping Rings and fixed energy beam transfer lines • Adjustable “Permanent” Magnet Quads needed for the NLC Main Linacs • +0 to -20% variation with center stability of 1 micron for beam based alignment • Achieved several microns achieved (electromagnets achieve 1 micron) • Need Help With • Improve center stability, time stability, temperature stability, motor controls, and new designs, understanding radiation damage David Finley to LC Retreat / Santa Cruz CA

Beam InstrumentationMarc Ross / SLAC • Transition and Diffraction Radiation monitors • Probably THE “imaging device” for the linear collider • Lots going on in this field: Practical questions and new physics • Bunch length • Use a transverse rf cavity (Cavity BPM) • Measure “tilt”(yz correlation) … which can indicate beginning of emittance growth (need about 2 nm) • Breakdown diagnostics using acoustic sensors • Used on XBand structures (coupler) and TTF rf gun • Acoustic sensors in RF structures will help advance room temperature development David Finley to LC Retreat / Santa Cruz CA

Feedback on Nanosecond Time scales (FONT)Phil Burrows / U of Oxford • Need four orders of magnitude improvement in luminosity compared to SLC • Need to keep beams in collision within the bunch train • NLC / TESLA has few / few hundred nanoseconds • Want equipment as “close as possible” (stay away from backgrounds which will damage equipment and minimize material for detectors) • For NLC ~ 3 meters from IP means about 25 nsec minimum delay • “Equipment” means beam piping, position monitors, kickers, electronics (amplifiers, mixers). • Experiment to be done at NLCTA (150 nsec bunch train) with goal of closing the feedback loop in ~30 nsec (by February 2003 or so) David Finley to LC Retreat / Santa Cruz CA

Ground MotionAndrei Seryi / SLAC • Two regimes: Fast and Slow • Fast: Beam offset cannot be corrected by pulse-to pulse feedback • Studies • Ground motion in NuMI tunnel at Fermilab • Noise versus depth • Tunnel to tunnel correlation in Los Angeles metro • Simulations: Damping Rings to IP (nice movies) • Inertial stabilization of Final Doublets David Finley to LC Retreat / Santa Cruz CA

Faster Kickers and Other Fun R&DDavid Finley / Fermilab • Injection/Extraction Fast Kicker Magnets for the TESLA Damping Rings • Surface Physics … polarized electrons • Remote Operation of FNPL • Surface Physics … better main linac cavities • Simulations of dark current transport David Finley to LC Retreat / Santa Cruz CA

5 minute talks • Jerry Abrams / LBL • Control System for a Linear Collider • Steve Csorna / Vanderbilt U • Diffractive radiation for beam profile • Laser interferometry / Laser Wire • Electro-optic for beam size • Bright needle electron sources • George Gollin / U of Illinois • Ultrasound sensors for structure breakdown diagnostics • Fast and stable kicker • Flowmeters • LLRF, ADC and DAC systems, accelerator control and feedback David Finley to LC Retreat / Santa Cruz CA

5 minute talks • Dan Amidei / U of Mich • Study and Simulation of Sources • Electron source (flat beam, modelling NLC and TESLA) • Flat beams to simplify damping rings • Polarized and positron sources • GAN (Global Accelerator Network) • Simulations for training students: FNPL rf gun • Joe Rogers / Cornell • Study Damping Rings with CESR • Wigglers, intrabeam scattering, space charge, electron cloud, short bunch length instabilities • Injection / extraction issues related to TESLA damping rings • Superferric wiggler David Finley to LC Retreat / Santa Cruz CA

5 minute talks • Ritchie Patterson / Cornell • Beam Simulation • Main Beam transport • Beam halo • Spin transport • Jerry Blazey / NIU (for Court Bohn) • Benchmark flatbeam simulation codes vs. FNPL experiments • Develop electron-beam diagnostics • Single shot interferometer • Low wakefield electro-optic diagnostic David Finley to LC Retreat / Santa Cruz CA

5 minute talks • Y. Fukui (presented by Tom Himel) / UCLA • Use the FFTB beam to test Optical Diffraction Radiation • Ron Poling / U of Minnesota • Source-to-Dump Accelerator Simulation as a User Tool • Yury Kolomensky / UC Berkeley & LBL • Tiltmeter • Uses RF cavity as BPM • Measure individual bunches in the range 1 to 15 mrad David Finley to LC Retreat / Santa Cruz CA

5 minute talks • Gerry Dugan / Cornell • Beam instrumentation to measure emittances • Especially beam based alignment for preserving emittances • Incorporating faults into simulations • Bill Fowler / Fermilab • Superconducting rf cavities • Reduce the amount of niobium used in TESLA • Physics of rf superconductivity, surface physics, metallurgy, films etc David Finley to LC Retreat / Santa Cruz CA

List of Lists • The LC R&D List … • by the self anointed ones: Himel, Finley, Rogers . • Gollin List: Based on responses of interested parties • Summary List: Same info as Gollin list but rearranged David Finley to LC Retreat / Santa Cruz CA

List of Lists • The LC R&D List … • by the self anointed ones: Himel, Finley, Rogers • Definition of anointed from the web • From Latin translation of Greek christos [anointed]. Smeared with sacred unguent, having oil or unguent poured on the head; a ceremony originally symbolically denoting a high degree of initiation, but later borrowed for minor purposes by the Christian churches in consecrations and coronations. A true anointed or christos is one who has achieved the great victory over self in initiation and therefore in life, and thus has become a full or complete adept or mahatma. • Gollin List: Based on Who responded • Summary List: Same info as Gollin list but rearranged David Finley to LC Retreat / Santa Cruz CA

Summary of Accelerator R&D David Finley / Fermilab Linear Collider Retreat / Santa Cruz CA June 29, 2002 Morning Tal