status report from cavity package · • cavity preparation • cavity field flat tuning • input...

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)


2

CPTS Cost Estimation for RDRand

Contact Person to Area System


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


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.


5

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


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


7

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.


8

Expected Problems in the CPTS


9

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


10

Engineering Efforts in KEK

1) Cavity2) High power input coupler3) Coaxial ball tuner system


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


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)


13

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


14

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


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]


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.


17

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


18

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]


19

STRUCTURE FOR POWER COUPLERSTRUCTURE FOR POWER COUPLER


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


21

PHOTOs OF RF WINDOW AT COLD SIDEPHOTOs OF RF WINDOW AT COLD SIDE

On 23 Feb 2006

Cold RF window


22

PHOTOs OF PARTs FOR POWER COUPLERPHOTOs OF PARTs FOR POWER COUPLER

Bellows at cold side

Bellows at warm side

Inner conductor at warm side


23

PHOTOs OF COAXIAL LINE AT COLD SIDEPHOTOs OF COAXIAL LINE AT COLD SIDE

Inner conductor at cold side Outer conductor at cold side


24

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


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


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.)


27

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


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


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


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%.

status report from cavity package · • cavity preparation • cavity field flat tuning • input...

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