June 29, 2002David Finley to LC Retreat / Santa Cruz CASlide 1 Summary of Accelerator R&D David Finley / Fermilab Linear Collider Retreat / Santa Cruz CA June 29, 2002 Morning Talks Afternoon 5 Minute Talks Lists

June 29, 2002David Finley to LC Retreat / Santa Cruz CASlide 2 Permanent Magnets Jim 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

June 29, 2002David Finley to LC Retreat / Santa Cruz CASlide 3 Beam Instrumentation Marc 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

June 29, 2002David Finley to LC Retreat / Santa Cruz CASlide 4 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)

June 29, 2002David Finley to LC Retreat / Santa Cruz CASlide 5 Ground Motion Andrei 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

June 29, 2002David Finley to LC Retreat / Santa Cruz CASlide 6 Faster Kickers and Other Fun R&D David 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

June 29, 2002David Finley to LC Retreat / Santa Cruz CASlide 7 Summary of Accelerator R&D David Finley / Fermilab Linear Collider Retreat / Santa Cruz CA June 29, 2002 Morning Talks Afternoon 5 Minute Talks Lists

June 29, 2002David Finley to LC Retreat / Santa Cruz CASlide 8 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

June 29, 2002David Finley to LC Retreat / Santa Cruz CASlide 9 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

June 29, 2002David Finley to LC Retreat / Santa Cruz CASlide 10 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

June 29, 2002David Finley to LC Retreat / Santa Cruz CASlide 11 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

June 29, 2002David Finley to LC Retreat / Santa Cruz CASlide 12 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

June 29, 2002David Finley to LC Retreat / Santa Cruz CASlide 13 Summary of Accelerator R&D David Finley / Fermilab Linear Collider Retreat / Santa Cruz CA June 29, 2002 Morning Talks Afternoon 5 Minute Talks Lists

June 29, 2002David Finley to LC Retreat / Santa Cruz CASlide 14 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

June 29, 2002David Finley to LC Retreat / Santa Cruz CASlide 15 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

June 29, 2002David Finley to LC Retreat / Santa Cruz CASlide 16 Summary of Accelerator R&D David Finley / Fermilab Linear Collider Retreat / Santa Cruz CA June 29, 2002 Morning Talks Afternoon 5 Minute Talks Lists