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ILC R&D at KEK

ILC R&D at KEK. Beam Control Technology ATF ATF2. ATF bldg. Acceleration Technology High-gradient Cavities. L-band R&D Stand. Linac System  STF Construction of Infrastructure. STF Building. ATF. Accelerator Test Facility. Construction started in 1993

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ILC R&D at KEK

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  1. ILC R&D at KEK • Beam Control Technology • ATF • ATF2 ATF bldg • Acceleration Technology • High-gradient Cavities L-band R&D Stand • Linac System  STF • Construction of Infrastructure STF Building

  2. ATF Accelerator Test Facility • Construction started in 1993 • Originally as Damping Ring for warm collider • Achieved world smallest emittance ~2pm • Still usefull for ILC (the only ring that can provide required emittance) • World-wide collaboration going-on

  3. KEK Directorate CB (Collaboration Board) nominate appoint report assist report Spokesperson (+ 3 deputies) consult TB (Technical Board) assist coordinate report report report Coordinators Work Groups ATF Collaboration • 1993 construction started as Damping Ring for warm collider • World smallest emittance achieved • Internationalization GLC  ILC • MoU with ~20 institutes • Experiment program selected by TB (technical board) • TB mtg every May and Dec. consult SLAC, LBNL, FNAL, Cornell U, CERN, DESY, Orsay, INFN, several univs in London, IHEP, PAL, Japanese univs (Waseda, Nagoya, Tokyo, Hiroshima, etc)

  4. Pulsed Laser Wire Polarized positron production Beam image from XSR (sy=6.4mm) Consistency test from 3 cavity BPMs resolution ~17nm 3-bunch extraction ATF R&D Items • Beam tuning for low emittance • Beam dynamics studies (fast-ion, wiggler, etc) • Fast kicker development for ILC DR (next page) • High resolution ring BPM • Cavity BPM developments (ATF2, IP-BPM, ATF extraction line, etc) • Laser wire • Other beam diagnostics devices (XSR, ODR, etc) • S-band RF gun • CSR (coherent synchrotron radiation.) • Laser-Compton based polarized positron production • etc.

  5. Development of Fast Kicker (highlight of 2005) • ILC requires fast kickers with rise (fall) time of a few nsec (Otherwise Damping Ring would be too large) • Demonstrated in 2005 that ~3ns is feasible (excited an oscillation of stored beam) • Try extraction from ATF in 2006 by series of kickers Measured kick angle Extraction scheme from DR in ILC

  6. ATF2 • Extend ATF extraction line  Add Final Focus • Small beam size（～35nm） • Focus the ATF beam to ~35nm by ILC final focus optics • long-term maintenance • Beam center • Stabilization of the beam center to ~2nm • Bunch-to-bunch feedback systemby ILC-like beam • Construction start 2005, Operation startJan.2008 • Construction by international collaboration • Asia: fabrication of quads and BPM, etc • Americas: design, BPM electronics, magnet mover, power supply, etc • Europe: feedback, laser wire, final quad support, etc Q-BPM from PAL Qmagnet from IHEP

  7. < ~ Development of High Gradient Cavities • Baseline: TESLA-type • Gradient limited by surface magnetic field (max. ~40MV/m, operation 35MV/m) • LL (Low Loss)-type under R&D • Reached 51MV/m with single-cell cavities • 9-cell cavities under study • ~29MV/m yet • to be installed in STF Phase 1

  8. Cryogenic compressor Control Room Klystron Gallery For EP, Clean Room Infra-structure for SC-RF production Cryogenic liquefier underground space for Linac phase 1 & 2

  9. STF Phase 1 Valve Box First test at KEK of assembling all components 2 cryomodules (connected each other) each containing 4 cavities of TESLA-type and LL-type Weld connection Construction 2005-2006 Operation 2007 35MV/m TESLA-type cavities 45MV/m Low-loss cavities

  10. STF Phase 2 (2007-9) • Plan: construct 1 RF unit of ILC 1 bouncer-type modulator, 1 multi-beam 10MW klystron 3 cryomodules each containing 8 cavities • Cavity type: TESLA or LL (to be decided in 2007) • Design 2007 (during operation of phase 1) • Construction 2008-2009)

  11. EP bed of ILC Chemical treatment room Clean room for cavity assembly cryomodule assembly clean room construction carry hatch expansion STF Infra-structure • Clean room : New clean room completed in Mar.2006 • EP: New EP(Electro Polishing) facility, start construction in 2006 • To be used for STF Phase 2 cryomodule production • and other SC cavities for other projects (KEKB, crab, ERL,...)

  12. R&D Items at ATF • Emittance improvement of extracted beam (SLAC) • Longitudinal feedback for stabilization of extracted beam (SLAC) • Fast kicker (SLAC,LLNL) • Polarized electron source (Nagoya) • Polarized positron generation (Europe?) • Bunch-by-bunch feedback system (Oxford) • Laser wire (Kyoto, QMUL) • Cavity BPM (SLAC, Tohoku Gakuin)

  13. R&D Items at ATF2 • Beamline design (SLAC) • Quadrupole magnets (IHEP, SLAC) • Q-BPM (PAL, SLAC) • IP-BPM • IP Beam size monitor • Stable/reliable power supply (SLAC) • Stabilization of final doublet quadrupole (France, CERN)

  14. R&D Items at STF • MBK (multi-beam klystron) development • Baseline cavity fabrication with new coupler and tuner • Development of LL (Low Loss) single-cell cavity • Development of LL (Low Loss) 9-cell cavity with new coupler and tuner • Fabrication of Nb/Cu-clad seamless cavity • Photocathode system development

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