ilc r&d at kek
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
ILC R&D at KEK• Beam Control Technology
– ATF– ATF2
• Acceleration Technology– High-gradient Cavities
L-band R&D Stand
– Linac System STF– Construction of Infrastructure
STF Building
ATF bldg
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
ATF Collaboration
consult
CB (Collaboration
Board)
Spokesperson (+ 3 deputies)TB (Technical
Board)
KEK Directorate
Coordinators
Work Groups
assist report
repo
rt
report
report
report
appoint
nominate
assist
consult
coor
din
ate
•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.
SLAC, LBNL, FNAL, Cornell U,
CERN, DESY, Orsay, INFN, several univs in London,
IHEP, PAL,
Japanese univs (Waseda, Nagoya, Tokyo, Hiroshima, etc)
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.
Consistency test from 3 cavity BPMs resolution ~17nm
Pulsed Laser Wire
Polarized positron production
Beam image from XSR(y=6.4m)
3-bunch extraction
Development of Fast Kicker (highlight of 2005)
0
20
40
60
80
100
0 5 10 15 20 25 30
Pulse timing v.s. kick angle(FID FPG-3000M)
KickAngle(urad)
Delay(ns) Time
•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
Extraction scheme from DR in ILC
Measured kick angle
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 system by ILC-like beam
• Construction start 2005, Operation start Jan.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
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
109
1010
1011
0 10 20 30 40 50 60
Qo
Eacc []MV/m]
Eacc,max = 51.4MV/m @ Qo = 0.777E10
~<
• 9-cell cavities under study
• ~29MV/m yet
• to be installed in STF Phase 1
Infra-structure for SC-RF production
Cryogenic compressor
Cryogenic liquefier
Control Room
Klystron Gallery
For EP, Clean Room
underground space for Linac phase 1 & 2
STF Phase 1
Weld connection
Valve Box
45MV/m Low-loss cavities
35MV/m TESLA-type cavities
First test at KEK of assembling all components
2 cryomodules (connected each other)
each containing 4 cavities of TESLA-type and LL-type
Construction 2005-2006
Operation 2007
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)
STF Infra-structureClean room : New clean room completed in Mar.2006EP: 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,...)
Chemical treatment roomEP bed of ILCClean roomfor cavity assembly
cryomodule assembly
carry hatch expansion clean room construction
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)
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 (F
rance, CERN)
R&D Items at STF
• MBK (multi-beam klystron) development• Baseline cavity fabrication with new couple
r and tuner• Development of LL (Low Loss) single-cell
cavity• Development of LL (Low Loss) 9-cell cavit
y with new coupler and tuner• Fabrication of Nb/Cu-clad seamless cavity• Photocathode system development