Transcript 9-cell cavity coordination - International Linear Collider

Cornell Updates
3-cell re-entrant VT done, see slide.
Cavity quenched at 20MV/m, low Qo ~3e9.
2K leak happened after 3hrs passing λ-point.
New VT insert w/ T-map for multi-cell is ready.
9-cell + new T-map system will be tested soon.
31-Jan-12
38th ILC cavity group meeting
F. Furuta
Cornell Updates
3-cell re-entrant history
Previous VT results of LR3-1, 14April2009
LR3-1, 14Apr2009
1.00E+11
Oct-Dec2008 Tumbling,
29Jan2009
VEP(200um),HT(800C x 2h),
Micro-VEP, USC, HPR, 120C Bake,
15Apr2009 VT, Q-disease,
20May2009 HT (800C x 2h) again,
cavity stuck with furnace
and deformed when took out.
Nov 2011 ~ fixed deformation.
HF-rinse, HPR, no-bake.
Jan 2012
VT.
1.7K
Eacc=25.3MV/m
Qo=2.0E+09
1.00E+10
1.00E+09
1.00E+08
0.00
5.00
10.00
15.00
20.00
25.00
30.00
Flatness = 96%
31-Jan-12
38th ILC cavity group meeting
F. Furuta
Cornell Updates
VT LR3-1, 16&17 -Jan-2012
1.00E+11
14-Apr-09
16-Jan-12
Pi-mode meas.
Eacc=20MV/m
Qo=3.0e9
Limited by
Quench & 2K leak.
1.00E+10
1.00E+09
0.00
5.00
10.00
15.00
20.00
25.00
30.00
> Prep. = 800C*2h (in 2009), HF rinse(5min.), USC, HPR, no-bake.
> 2K leak happened ~3hrs after passing λ-point.
> re-meas. after pump down cavity over night.
> Cavity quenched at 20MV/m, 2K leak happened again.
31-Jan-12
38th ILC cavity group meeting
F. Furuta
Cornell Updates
9-cell w/ T-map boards
on new insert.
T-map boards covered
centre 7cells.
Re-entrant 3-cell on
current multi-cell
insert.
31-Jan-12
38th ILC cavity group meeting
F. Furuta
JLab Status
Rongli Geng, Ari Palczewski, Yongming Li
31jan2012
1/31/2012 Rongli Geng
38th ILC Cavity Group Meeting
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JLab Status: 9-cell Cavities
• Seamless 9-cell cavity EP processing
and instrumented RF testing
– Z164 RF tested with thermometry
• Previously quench limited at 21 MV/m in
Pi-mode after light EP
• Quench location in cell#4 identified
– 20 mm away from equator plane
• Optical inspection at predicted quench
location
– No outstanding geometrical feature at or
near predicted quench location
Z164
• 7 out of 9 cells reached high surface field
of 33-42 MV/m (Pi-mode equivalent)
– Z163 received light EP at JLab and first
RF test is completed
• Cavity reached quench limit with very
little field emission
• Data being analyzed, results to be
compared with the last test at DESY
• Next is thermometry test at JLab
1/31/2012 Rongli Geng
38th ILC Cavity Group Meeting
6
JLab Status: 9-cell Cavities
• Large-grain 9-cell cavity JLAB LG#1 completed
light EP and RF test (following local grinding at
JLab by KEK collaborators and medium
pressure rinsing at ground location)
JLAB LG#1
– First RF test had early field emission onset
– Second RF test after re-HPR
• Reached a highest gradient of > 28 MV/m
• Very high Q0 (> 3E10 at 15-20 MV/m) at 2K
• Field emitter turn on at high field followed by
performance degradation
• To be re-HPR’ed and re-tested
• Low-loss shape cavity ICHIRO8 9-cell cavity
processing and testing on-going at JLab under
JLab/KEK collaboration
ICHIRO8
– Field flatness tuned and light EP done in
December 2011
– KEK visitor Fumiaki Yasuda and Cornell visitor
Fumio Furuta are visiting JLab, working together
with JLab SRF workers
– HPR, clean room assembly, pump down, leak
check, 120C bake-out done
– RF test this week
1/31/2012 Rongli Geng
38th ILC Cavity Group Meeting
7
JLab Status:
Cryogenic Radiation Instrumentation & Dark Current Simulations
• Cryogenic radiation instrumentation
– New diodes first test completed
• FIL-UV20 (OSI)
– Data being analyzed
• Dark current Simulations
– ACE3P simulation studies of multipacting in
TESLA cavity HOM can are completed
• Reconfirmed MP barriers previously identified by
earlier workers
• New barriers predicted
• To be verified experimentally
TESLA cavity
With HOM can
– MP studies extended to HOM cans in CEBAF
upgrade 7-cell cavities
– TESLA shape 9-cell cavity model completed
• First test with electron emission from iris done
• Electron emission to be extended to HOM can area
1/31/2012 Rongli Geng
38th ILC Cavity Group Meeting
CEBAF upgrade cavity
with HOM can
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Fermilab S0 News
• No vertical tests Nov.9 - Jan.18
– VTS and cryogenic system upgrades/maintenance completed
• Two 1-cell cavities were tested Jan.18-19 for basic R&D
• TB9ACC015 was tested yesterday
– Limiting pit was tumbled away, ~18 MV/m -> ~35 MV/m
– Test Oct.27: 35 MV/m with Q0=1E10
•
•
Reaches ILC spec in gradient and Q0, but still high field emission
Cavity was tested with add’l FE instrumentation (Faraday cup) as part of instrumentation development
– Re-test Jan.30: 32 MV/m with Q0=1E10
•
•
•
Re-HPR and re-assembly
FE starting at 13 MV/m, with FE-loading of Q beginning at 20-21 MV/m, and FE-induced quench at 24MV/m.
Some FE processing occurred - cavity finally reached 32MV/m, limited by FE-induced quench
Cavity was tested again with the Faraday cup
31.January 2012
Ginsburg FNAL S0 Report
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