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K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
1
Status Report from Cavity Package Tech System(CPTS)
• Preparation for the RDR Cost Estimation• Contact Person to the Area System• Expected Problems • Engineering Efforts in KEK
K.Saito(KEK), D.Proch(DESY) and J.Mammosser(Jlab)
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
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CPTS Cost Estimation for RDRand
Contact Person to Area System
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
3
NCRF< ~100MeV
SCRFCapture15MV/m
SCRF0.1 – 5GeV
SCRF0.25-5GeV
SCRFCW operation
SCRFBunch
compressor
SCRF5-250GeV
X 2
SCRFCrabcavity
E-Injector 1.3GHzNormal
conducting-
ILCBaseline
like- - - -
P-Injector ILCBaseline
like-
ILCBaseline
Like- - -
DR- - - -
650MHzKEKB/Cornell
like- -
RTML- - - - -
ILCBaseline
like-
ML- - - - - -
ILCBaseline
BDS KEKB likeCrab cavity
NCRF cavity for E-source: Need to assign a volunteerSCRF for DR: KEKB/Cornell like @ 650MHz
ILC Baseline cavity package: TESLA TDR and US cold optionBDS crab cavity system: KEKB like
Areas covered by CPTS
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
4
Cost Estimation Items in CPTS• NCRF Cavity• SCRF Cavity: Material, TESLA-shape cavity Fabrication• LHe tank on the cavity with LHe supplying tube• Tuner• Input coupler• HOM @ end of the module• Cavity Preparation• Cavity field flat tuning• Input coupler processing• Cavity assembly for acceptance test (vertical test)• Cavity Acceptance test (vertical test)• Cavity String assembly
Red items are not clearly defined for CPTS but must be covered.
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
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Module* Cavities LHe tank
Tuner Input coupler
HOM Methodology of cost estimationContact person to ASL (Candidates, not yet fix)
152 EU : TESLA TDR + input of RDR cost estimation methodology+ EURO XFEL
USA : USCOP
+ input of RDR cost estimation methodology
Asia : New cost estimation by the RDR cost estimation methodology
KEKB like cavity
Shinji Mitsunobu(?)
KEKB like crab cavity
Kenji Hosoyama (?)
152
24
456
24
456
4416
3168
7488
16336
1
1
1
E-Injector 19 152 152
1
19
19
3
57 456 456 456 57
3 24 24 24 3
57 456 456 456 57
936 7488 7488 7488 936
396 3168 3168 3168 396
1 1 1 1 2
1 1 1 1 2
552
2042
2
2
152
P-Injector 19 152 152 152
3 24 24 24
552 4416 4416 4416
Baseline cavity total 2042 16336 16336 16336
1 1 1 1
1 1 1 1BDS Electron crabPositron crab
DR ElectronPositron
ML Electron 15 –150GeV
Electron 150-250GeV
Positron 15-250GeV
RTML E- 1st BCE-2nd BCP-1st BCP-2nd BC
* Module includes 8 cavities.
Dieter Proch
John Mammosser
Kenji Saito
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
6
- we are looking for a volunteer with normal conducting cavity- we will ask volunteer to KEK/Cornell colleague for DR- we will ask volunteer to KEK colleague for crab cavity in the BDS
Contact Person to Area SystemNot yet fixed, but probably D.Proch
Volunteers
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
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Proposal of the on-site facilities from CPTS• Cavity Preparation facility on the ILC site• Cavity Acceptance Test (Vertical Test) on the ILC site• Cavity String Assembly Facility on the ILC site• Input coupler processing Facility on the ILC site
Cavity production rate ~17/day (for 4 years)Acceptable resources for the ILC mass production, ~10 places:for example preparationDESY, Hankel, KEK, Nomura Plating, Jlab, FNAL/ANL+ OthersCurrent or future resources will be a half capacity of that needed in the ILC production.
1) Too much production rate for existing resource use.2) Will be too expensive in company site facility and difficult for repairing modules.3) We need a close communication between Preparation and VT for the reliable performance.4) Assembled cavity string is not robust then,
transportation will be a problem on the alignment.5) Special cleaning tech and clean assembly facility is needed.for input coupler assembly.
it can be shared with cavity in case of the on site.
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
8
Expected Problems in the CPTS
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
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Expected problemsTechnical 1) Not yet fixed the BCD on the tuner system
2) Estimation of the time consuming process: coupler processing3) Scattering of the cavity performance
Temporal 1) How to open the intellectual information
Resourcelimitation
1) Need a help for NCSR2) DESY is too busy with the EURO XFEL3) KEK crab people is too busy with the KEKB installation
List of the expected problem on the cost estimation in CPTS
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
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Engineering Efforts in KEK
1) Cavity2) High power input coupler3) Coaxial ball tuner system
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
11
BCD on Cavity Package and Engineering EffortILC BCD ILC ACD
Cavity TESLA shape by polycrystalline Nb sheet
Operation 31.5MV/m
/RE shape, large or single crystal Nb sheetOperation 36MV/m
Input Coupler TTF-III Type(twin cylindrical windows)
Two Disk type coupler
Tuner Saclay/TTF tuner is close to the BCD,but no candidate for BCD at the current
Coaxial tunersBlade tuner
Engineering issuesCavity : Narrow scattering in the current performance
Input coupler : Reduce the fabrication costTuner : Establish the BCD
LL
TRISTAN typeCapacitive coupling
Coaxial ball tunerSlide tuner
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
12
Scatter at DESY Eacc vs. time
0
5
10
15
20
25
30
35
40
45
Jan-95 Jan-96 Jan-97 Jan-98 Jan-99 Jan-00 Jan-01 Jan-02 Jan-03 Jan-04 Jan-05 Jan-06
E acc
[MV/
m]
BCPEP10 per. Mov. Avg. (BCP)10 per. Mov. Avg. (EP)
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
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Statistics with 45MV/m achievement in the first roundSingle cell cavity study @ KEK
ACD shape45MV/m yield rate 50% now
108
109
1010
1011
0 10 20 30 40 50
ICHIRO Single cell 1st round
IS#2-2ndIS#3-1stIS#4-1stIS#5-1stIS#6-1stIS#7-1st
Qo
Eacc[MV/m]
10 9
10 10
20 25 30 35 40 45 50 55 60
1st round @KEK recipe
Qo
@ E
acc,
max
Eacc,max [MV/m]
By F.Furuta, T.Saeki,K.Saito, T.Higo,T.HigoOrr-san
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
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What is problem?
Statistics
Accidental16.7% (?)
FE initiated by MP16.7%
Quench16.7%
No problem50%
108
109
1010
101101020304050
Qo
Eacc [MV/m]
108
109
1010
1011
0 10 20 30 40 50
Qo
Eacc[MV/m]
108
109
1010
1011
0 10 20 30 40 50
Qo
Eacc[MV/m]
Eacc=28.3MV/mQo=1.94e9
limited by FE
after processing X-ray started from 15MV/m
X-ray started ~11MV/mcould not process out
CBP+CP(10um)+Anneal(750C*3hr)+EP(80um)+HPR(UPW)@Nomura(12/9)+Baking(120C*48hr)during HPR, TOC=18-18, Bacteria=1~0
β=99S=1.61e-8
Assembly or HPR problem
EP acid agitation ?
Oxidation, EBW,field enhancement ?
EP Temp. vs. Nb in EP acid (IS2,3,4,5,6,7)
2830323436
0 2 4 6 8Nb in EP acid (g/ L)
Tem
p. of
EP
acid
inca
vity
EP Voltage vs. Nb in EP acid (IS2,3,4,5,6,7)
171819202122
0 2 4 6 8Nb in EP acid (g/ L)
EP V
olta
ge
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
15
109
1010
20 25 30 35 40 45 50 55 60
Re-HPR with UPW
Qo
@ E
acc,
max
Eacc,max [MV/m]
109
1010
20 25 30 35 40 45 50 55 60
1st round @KEK recipe
Qo
@ E
acc,
max
Eacc,max [MV/m]
109
1010
20 25 30 35 40 45 50 55 60
HF Rins
Qo
@ E
acc,
max
Eacc,max [MV/m]
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
16
9-cell cavity R&D in KEK for ILC-ACD
108
109
1010
1011
0 5 10 15 20 25
Q o
Eacc [M V /m ]
IC H IR O 9cell-0 (a cavity w ithout H O M ports)
Eacc=24.5M V /mQ 0=7.03E9
35MV/m baseline cavity R&D and 45MV/m ACD (ICHIRO cavity) R&Dboth just started in KEK.
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
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Thermal anchor
5K 80K
RF
Major Parameters
Input rf power: 500 kW
Pulse width: 1.3 msec
Repetition rate: 5 Hz
Average rf power: 3.25 kW
Thermal loss [W]
80K 5K 2K
Static: 1.24 0.54 2.6x1e-4
Dynamic: 2.14 2.88 0.25
Total: 3.38 3.42 ~0.25
Cold rf window
By Matsumoto and Kazakov @ KEK
RRR: 3.5 (measured data)
Input Coupler for ILCInput Coupler for ILC--ACDACD
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
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INDUSTRIALIZATION with MODULAR STRUCTUREINDUSTRIALIZATION with MODULAR STRUCTURE
Input coupler comprises of four modules:
1) coaxial transformer
2) coaxial line
3) rf window
4) antenna at cold side
The complete input coupler can be divided into four relatively simple parts to ease fabrication and assembly. If we assume that the inner conductors are not attached rigidly to the waveguide, we need only two bellows to absorb the movement of the coaxial line due to thermal contaction and expansion between cool down and warm up.
The fabrication of each module dose not overlap for the technical requirements.
Each pair of rods is mounted in the gap between the inner- and outer-conductors, and are rotated 90 degrees from each other.
[1]
[2]
[3]
[4]
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
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STRUCTURE FOR POWER COUPLERSTRUCTURE FOR POWER COUPLER
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
20
High Power Test Stand for ILCHigh Power Test Stand for ILC--ACDACD
High power test stand is under preparing.
Waveguide
Transmission type waveguide
SCHEDULES FOR EARLY 2006
-End of MARCHCoupler fabrication.Deliver from TOSHIBA.
-Middle of MARCHHigh power test stand.
-Middle of AprilHigh power test
Warm rf window
Support frame
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
21
PHOTOs OF RF WINDOW AT COLD SIDEPHOTOs OF RF WINDOW AT COLD SIDE
On 23 Feb 2006
Cold RF window
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
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PHOTOs OF PARTs FOR POWER COUPLERPHOTOs OF PARTs FOR POWER COUPLER
Bellows at cold side
Bellows at warm side
Inner conductor at warm side
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
23
PHOTOs OF COAXIAL LINE AT COLD SIDEPHOTOs OF COAXIAL LINE AT COLD SIDE
Inner conductor at cold side Outer conductor at cold side
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
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Coaxial ball tuner system for ILC-BCDSchematic of Tuner Setup
Wheel to drive ball screw
Wheel with spork
Piezo
Worm
MS1
AA
BB
Jacket
SG
φ
MS2
By Y.Higashi, T.Higo and H.Yamaoka
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
25
Resonant points and linearity
0
0. 01
0. 02
0. 03
0. 04
0. 05
100 200 300 400 500 600 700 800
r esonant f r equency sear ch dat a
Fr eq/ HV kHz/ V
Freq
/HV
kHz/
V
Fr eq Hz0
1
2
3
4
5
0 20 40 60 80 100 120
Har moni c Response at 350Hz mode 060302
350Hz Fr eq kHz
Freq
uenc
h sh
ift
[kH
z]Pi ezo dr i ve Hi gh Vol t age [ V]
Resonant response by driving piezo sinusoidally.
Several modes can be candidates to use for tuning Several modes can be candidates
to use for tuning. Higher end limited by present power supply.
Goal for 45MV/m
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
26
Harmonic excitation at 350Hz
- 50
0
50
100
150
- 0. 8
- 0. 6
- 0. 4
- 0. 2
0
0. 2
0. 4
0. 6
0. 8
0 0. 002 0. 004 0. 006 0. 008 0. 01
Har moni c exci t at i on at 350HzHV [ V]Ave_MS1 [ mi cr on]
Ave_MS2 [ kHz]
HV [
V]
Ave_MS1, MS2 [micron]
Ti me [ sec]
- 50
0
50
100
150
- 1
- 0. 5
0
0. 5
1
0 0. 005 0. 01 0. 015 0. 02 0. 025 0. 03 0. 035 0. 04
Har moni c exci t at i on at 350Hz
HV [ V]
MS1+MS2 [ mi cr on]MS1- MS2 [ mi cr on]
HV [
V]
MS1+MS2, MS1-MS2 [micron]
Ti me [ sec]
Main component is cavity breezing mode. (Blue in right figure)
Slow rolling mode coexists at very low frequency. (Red in right figure)
(HV might be half!? Should be checked.)
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
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Harmonic excitation at 350HzFrequency shift
• Frequency shift agrees with cavity length within a factor of 1.5.
- 50
0
50
100
150
- 0. 8
- 0. 6
- 0. 4
- 0. 2
0
0. 2
0. 4
0. 6
0. 8
0 0. 002 0. 004 0. 006 0. 008 0. 01
Har moni c exci t at i on at 350HzHV [ V]Fr eq kHz
( MS1+MS2) *0. 368 [ kHz
HV [
V]
(MS1+MS2)*0.368, dF [kHz]
Ti me [ sec]
Drive HV
Cavity lengthFreq shift
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
28
Frequency spectrum from transient
200 400 600 800 1000
0.005
0.01
0.015
0.02
0.025
- 5
0
5
10
15
- 2
- 1
0
1
2
0 0. 01 0. 02 0. 03 0. 04
Tr ansi ent 2ms pul se
Driv
e [V
]
Freq shift [kHz]
Ti me [ sec]
FFT
Contribution from resonances around
250Hz350Hz
are essential for later big amplitude.
Later big oscill.Initial slope
Initial slope 3ms delay, ~0.5kHz
Later big oscill. ~15ms later, ~2kHz
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
29
Cavity length and frequency shift
- 1. 5
- 1
- 0. 5
0
0. 5
1
1. 5
0 0. 005 0. 01 0. 015 0. 02 0. 025 0. 03 0. 035 0. 04
060302_t r ansi ent _2ms_m0V- p8VTot al cavi t y l engt h vs f r equency shi f t
( MS1+MS2) * 0. 368 [ kHz]Phase_2ms_0- - 8V [ kHz]
Tran
sien
t fr
eque
ncy
shif
t [
kHz]
Ti me [ sec]
δF well agreed with cavity length expansion x dF/dL_static
Green δFRed cavity length x dF/dL
K.Saito ILC GDE Meeting at LICWS06 on 9-12 March 2006 in Bangalore, India
30
Preliminary Conclusion on the coaxial ball tuner system by Higo et al.
• With slow and fast tuners integrated in a realistic configuration, cavity response by harmonic excitation and transient excitation were studied.
• Resonances around 250Hz and 350Hz are significant, both in harmonic excitation and transient excitation.
• In resonant case,– 100V drive at room temperature at 350Hz makes cavity frequency
tuning by 5kHz.• In transient case,
– Frequency shift agrees with cavity total length change – First slope appears 3msec later. The amplitude is 0.5kHz.– Around 15ms later, grows to large oscillation of about 2kHz.– 5Hz interval (200ms) later, oscillation damps << 10%.