First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP...
-
Upload
darren-washington -
Category
Documents
-
view
222 -
download
0
Transcript of First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP...
![Page 1: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/1.jpg)
First Mini-workshop on IHEP 1.3GHZ SRF
LLRF and Tuner
Sun YI (孙 毅)
Accelerator Center, IHEPJune 10, 2009
![Page 2: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/2.jpg)
content• Review on BEPC RF & BEPCII S
RF
• Block diagram of 1.3GHZ LLRF
• Tuner and piezo of 9-cell cavity
• Problems
• Summary
![Page 3: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/3.jpg)
Beijing Electron Positron Collider (BEPC)Institute of High Energy Physics, CAS
![Page 4: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/4.jpg)
The old BEPC was one Ring machine before the upgrade at 20054 cavities of 200MHz in BEPC tunnel
4 transmitters ( tetrode ) inside West RF hall2×30KW to feed one cavity ( 200MHz )
LLRF station for 4 cavities
![Page 5: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/5.jpg)
2 LLRF stations are located respectively at the East/west RF hall beside each Klystron & PS, the cryogenic hall is above the test room
![Page 6: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/6.jpg)
PLC touch panel for each SRF station
![Page 7: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/7.jpg)
In a station: Superconducting cavity,250KW klystron and LLRF control system
![Page 8: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/8.jpg)
![Page 9: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/9.jpg)
![Page 10: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/10.jpg)
![Page 11: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/11.jpg)
PLC touch panelshow different pages:1) RF system interlock2) main parameters3) plot 4) cryogenic & cavity Q0
![Page 12: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/12.jpg)
Part 2 block diagram of 1.3GHZ LLRF
![Page 13: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/13.jpg)
F-1 signal generation
![Page 14: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/14.jpg)
Prof. Wang Guangwei is in charge of the R&D of the FB loops of LLRF.
Liu Rong ( PH.D student ) will visit KEK and work at STF for the digital LLRF feedback loops on Sep., 2009
LLRF workshop will be hold on Oct.,2009 at KEK, A chance of discussion and working for the FB loops at STF.
![Page 15: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/15.jpg)
CW Pulse
Feed-Back Feed-Forward
Micro-phonics ±0.50 ±3HZ
Beam Loading
QL~1.7×106 BW~764HZ
Lorentz Detune K~1.1 18MV/m ~230 153HZ
Part 3 tuner and piezo target for Q0~1010 、 QL~106→BW~1000HZ 1.3GHZ cavity freq. <±0.10 ,→ ±1HZ →dynamic range±~3nm
STF target : →±50HZ ( with beam?)
![Page 16: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/16.jpg)
4 kinds of tuner
Coaxial Ball Screw 500N/mm (Saito)
Blade 25N/um ( INFN for TTF )
Slide Jack 290N/mm (STF)
Cam+lever 60N/um (Saclay-2)
![Page 17: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/17.jpg)
First try to test a slide jack tuner
• IHEP case: one cavity in one cryostat
• Spring compensation for BEPCII cavity
• STF cavity only rely on elastic force ? (without compensation spring)
• How to “pre-tuning” under 2K?
![Page 18: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/18.jpg)
BEPCII 超导腔调谐补偿弹簧示意图
![Page 19: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/19.jpg)
Conception design of tuner and cryostat is on the way
![Page 20: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/20.jpg)
IHEP 1.3GHZ SCC tuner
![Page 21: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/21.jpg)
STF freq. vs tuner position ≈300KHZ/mm
![Page 22: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/22.jpg)
![Page 23: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/23.jpg)
IHEP need more Simulation and calculation
cavity freq. ~ tuner force ~ Ti jacket Stiffness
IHEP should reduce the mistakes and risks before the fabrication of the tuner.
![Page 24: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/24.jpg)
Stiffness of the Tuner System
KCavity
KJacket KTuner
80 N / m 220 N / m
59 N / m
![Page 25: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/25.jpg)
Improvement in the STF Baseline Cavities
Stiffness of Cavity Fixing Support 72 kN/mm 22 kN/mmLorentz Detuning -520 Hz -870 Hz (31.5 MV/m)
TTF Cavity
Inside M – Shield. Thick Titanium Baseplate,Thick Nb Beam Tube & Thick Nb End-cell
STF Baseline Cavity
Cell Taper13 deg. → 10 deg.
Beam Tube78 → 84
Input Port40 →
STF Baseline Cavity TTF CavityFz
Fr
![Page 26: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/26.jpg)
Part 4 problems: Location of Tuner ( in the middle or in one side of cryostat ? )
![Page 27: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/27.jpg)
直线导轨Linear guider
丝杠螺母机构
齿轮传动机构
Piezo孔
参考面
基准面
Upgrade to STF tuner is possible?
![Page 28: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/28.jpg)
Other questions• STF tuner had been test at RT , cold test on the
tuner is needed?• The motor screw is too long, why STF did not
set the motor inside the tank? • How to measure the tuner position? • The materials of roller wedge and ball?• Details of the taper gear, and motor gear box• Materials of tuner flange and 4 supporting rod?
![Page 29: First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner Sun YI (孙 毅) Accelerator Center, IHEP June 10, 2009.](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649eec5503460f94bfe224/html5/thumbnails/29.jpg)
summary• IHEP have collected experience on the KEKB
superconducting cavity, and have a happy history of the co-operation with KEK
• the design on 1.3GHZ tuner and LLRF has been begun since the end of 2008, there is a hard way to reach the test with cavity.
• IHEP still keep a lot of questions and hope the help from STF experts
THANKS!