Post on 31-Jan-2018
2010-3-28 1
SRF GroupInstitute of Heavy Ion Physics, Peking University
ILC GDE Meeting 2010/26/03, Beingjing
Efforts on the R&D of SRF cavity at Peking University
2010-3-28 2
Ø Cavities made by Peking University
Ø Development of relative techniques
Ø Future plan
Contents
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Cavities made by Peking University
Efforts on the R&D of SRF cavity at Peking University
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1988 1994
2000
2006
2005大晶粒铌大晶粒铌大晶粒铌大晶粒铌材超导腔材超导腔材超导腔材超导腔2004
2002
2009
20082007
SRF group
2×9cell
2×3.5cellDevelopment of SRF at PKU
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L-G Nb Cavities made by Peking University
Collaboration with OTIC to develop Large Grain Nb cavity since 2005
ØSimplify the machine process of Nb sheetsØOnly BCP is needed
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In 2006, acceleration gradient of 1.3GHz Large grain single cell reached 43.5MV/m, Bp=185mT PKU Large Grain cavity
after post-purification at 1250C
1.0E+09
1.0E+10
1.0E+11
0 10 20 30 40 50
Eacc[MV/m]
Qo
Test #5a, a fter 1250C+bakingTest#1BCP+baked, before 1250C
Quench
L-G Nb Cavities made by Peking University
After BCP treatment & baking at 1200C for 12 hrs by Dr. P. Kneisel at J-Lab
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In 2007, large grain 2-cell cavity , 40 MV/m
L-G Nb Cavities made by Peking University
Vertical test at DESYAfter 80 µµµµm BCP, HT 8000C, 100 µµµµm EP, 4 x HPR, HT 1200C in Ar atmosphere, kept at 90-140 K for 24 hours
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In 2009,3.5cell large grain cavity, 23.5MV/mL-G Nb Cavities made by Peking University
Vetical test at JLab
Large grain 3.5 cell Nb cavity of 23.5 MV/m @ Q0 >1E10 after BCP, HPR and HT 2 hrs at 8000c by Dr. R. Geng at J-Lab
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no quench
In 2008, first 9-cell cavity in China,,,,Eacc is 23MV/mF-G Nb Cavities made by Peking University
Vertical test at JLab
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F-G Nb Cavities made by Peking University
Fine grain Nb cavity
Treated & Tested by Dr. P Kneisel at JLab
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10 Cavities totally10 Cavities totally10 Cavities totally10 Cavities totally,,,,6666 with end groupwith end groupwith end groupwith end group
3 single cell,,,,2 2-Cell,,,,1 5-Cell,,,,2 3.5-Cell,,,,3-9Cell
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Development of Relative Techniques for Cavity
Recent Progresses of SRF Technology at Peking UniversityRecent Progresses of SRF Technology at Peking UniversityRecent Progresses of SRF Technology at Peking UniversityRecent Progresses of SRF Technology at Peking University
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Development of Relative Techniques for Cavity
Deep drawing and machining of cups
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Development of Relative Techniques for Cavity
EBW studies: collaboration between HIT (Harbin Institute of Technology) and PKU
266×1.7(mm)
1 EBW machine
2 sample welding
3 dumbbell welding
4 cavity welding
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Development of Relative Techniques for Cavity
RF test and tuning of cups and dumb–bells
Measure the frequency and coupling factor (k) for the dumb-bell
Measure the frequency of cups
Geometrical test
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Development of Relative Techniques for Cavity
Defect detection
Cleaning
Anode oxidizing
BCP Polishing
Processing of Nb dumbbells
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Development of Relative Techniques for Cavity
Annealing at 1250°C in Nb box with Ti plate & rod at
Ningxia OITC
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Development of Relative Techniques for Cavity
Tuning for 9-cell cavity
SRF cavity tuning facility
Before Tuning
110.00
110.50
111.00
111.50
112.00
112.50
113.00
113.50
114.00
0.00E+00 5.00E+00 1.00E+01 1.50E+01 2.00E+01 2.50E+01 3.00E+01 3.50E+01 4.00E+01 4.50E+01
Time(s)
Deg
rees
`
After Tuning
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Development of Relative Techniques for Cavity
HOM coupler
Fundamental mode
HOM coupler test results
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Recent Progresses of SRF Technology at Peking UniversityRecent Progresses of SRF Technology at Peking UniversityRecent Progresses of SRF Technology at Peking UniversityRecent Progresses of SRF Technology at Peking UniversityFuture Plan
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DC-SC photocathode injector
3+1/2 cell cavity is installed in DC-SC photoinjector
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DC-SC photocathode injector
Cryostat of 3.5cell DC-SC photoinjector
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Cryo-modules
LHe输液管 预冷管 He回气管LHe储存罐液面计 9-cell 超导腔超导腔液氦槽 两相管 LN 管道及LN 冷屏恒温器真空容器 LN 储存罐
主耦合器悬挂结构调谐器水平拉杆 真空泵接口 门阀测温电阻 超导腔内部支撑LN 屏支撑
9-cell cavity is installed in a Cryo-mudule
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Cryo-modules
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Future Plan
ØBCP system for 9-cell cavity and vertical test system will be built
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Future Plan
A “well” with 5m depth and 1.3m diameter is ready
acceleratorinjector
2K
undulator
RF power laser
Cryogenic system
Test cave
Clean roomCooling water system
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Future Plan
First 2K cryogenic system for SRF in China
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Future plan
More 9-cell cavities will be fabricated with higher Eacc!
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Thank you!
Recent Progresses of SRF Technology at Peking University
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lBCP, ~ 100 µm
l600°C , 10 hrs
lField flatness tuning
lBCP,~50 µm
lHPR,~ 5 hrs
lBCP,~50 µm
Pretest processing of 9-cell cavity
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30840[Ω*Ω]R/Q*G
271[Ω]G
113.8[Ω]R/Q
4.15[mT/(MV/m)]Bpeak/Eacc
1.98-Epeak/Eacc
1.9[%]kcc
35[mm]riris
37970
284
133.7
3.61
2.36
1.52
30
35123
277
126.8
3.76
2.21
1.8
33
TTF LL RE
1992 2002/2004 2002
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Efforts on the R&D of SRF cavity at Peking University
Heat load (at 2K)
Pulsed CWStatic heat load of main accelerator 12 W 12 WDynamic heat load of main accelerator 4.4 W 88 WStatic heat load of injector 6 W 6 WDynamic heat load of injector 1 W 20 WTransfer lines 10 W 10 WTotal heat load without contingency 33.4 W 136 WTotal static heat load with 50% contingency
42 W 42 W
Total heat load with 50% contingency 50.1 W 204 W (150L/h)
DutyFactorQRQ
VPdiss ×
⋅=
/0
2