CW couplers KEK injector couplers Eiji Kako KEK

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CW couplers; KEK injector couplers Eiji Kako (KEK, Japan) TTC at Cornell, 2013 June

CW couplers; KEK injector couplers Eiji Kako (KEK, Japan) TTC at Cornell, 2013 June 13 1

OUTLINE 1. compact-ERL injector cryomodule 2. Specification and fabrication 3. Conditioning of prototype couplers

OUTLINE 1. compact-ERL injector cryomodule 2. Specification and fabrication 3. Conditioning of prototype couplers 4. Improvement of cooling by gas-flow 5. Improvement of water cooling 6. Conditioning at test-stand cryomodule 7. Beam operation of compact-ERL 8. Summary and next step Eiji Kako (KEK, Japan) TTC at Cornell, 2013 June 13 2

c. ERL Injector Cryomdule Completed in 2012, June. After low and high power rf

c. ERL Injector Cryomdule Completed in 2012, June. After low and high power rf tests, beam operation started in 2013, April. e- beam 0. 5 5. 5 Me. V 10 m. A CW Input Couplers Eiji Kako (KEK, Japan) TTC at Cornell, 2013 June 13 3

Main Specification for Injector Cryomodule (c. ERL injector ; Ibeam = 10 m. A,

Main Specification for Injector Cryomodule (c. ERL injector ; Ibeam = 10 m. A, Ebeam = 5 Me. V) Cavity - 1 Cavity - 2 Cavity - 3 Vc 1. 5 MV 1. 75 MV Eacc 6. 5 MV/m 7. 6 MV/m QL (10 m. A) 7. 2 x 105 8. 4 x 105 PRF (10 m. A) 15 k. W /2 17. 5 k. W /2 RF Source Klystron – 1 30 k. W, CW Ibeam = 100 m. A, Ebeam = 10 Me. V Klystron – 2 300 k. W, CW for future 3 Ge. V-ERL Final target of required RF power = CW 180 k. W / coupler Eiji Kako (KEK, Japan) TTC at Cornell, 2013 June 13 4

Fabrication of CW Input Couplers Two prototype input couplers (completed in 2009, Oct. )

Fabrication of CW Input Couplers Two prototype input couplers (completed in 2009, Oct. ) (completed in 2011, June) (finished conditioning in 2010, Nov. ) Eiji Kako (KEK, Japan) Six input couplers for c. ERL injector (finished conditioning in 2012, Jan. - Apr. ) (installed in cryomodule in 2012, May) TTC at Cornell, 2013 June 13 5

Design of Prototype Input Couplers Water Cooling Doorknob Tristan-type Coaxial Disk Ceramics RF Window

Design of Prototype Input Couplers Water Cooling Doorknob Tristan-type Coaxial Disk Ceramics RF Window Coaxial line Warm window 300 K 80 K 5 K Zo = 41. 5 W Eiji Kako (KEK, Japan) TTC at Cornell, 2013 June 13 6

Conditioning of prototype input couplers 300 k. W CW Klystron Eiji Kako (KEK, Japan)

Conditioning of prototype input couplers 300 k. W CW Klystron Eiji Kako (KEK, Japan) TTC at Cornell, 2013 June 13 7

Conditioning results at Test Stand Fan/on Conditioning Results • 1 ms, 10 Hz, (1%)

Conditioning results at Test Stand Fan/on Conditioning Results • 1 ms, 10 Hz, (1%) 200 k. W for 2 h • 1 s, 0. 1 Hz, (10%) 100 k. W for 2 h • cw 30 k. W for 1. 5 h • cw 50 k. W for 0. 5 h • cw 100 k. W for 1 min Day - 7 Eiji Kako (KEK, Japan) TTC at Cornell, 2013 June 13 8

Improvement of cooling by N 2 gas-blow Water Cooling N 2 blow 300 K

Improvement of cooling by N 2 gas-blow Water Cooling N 2 blow 300 K 80 K 5 K Halls for N 2 flow Material of bellows & tube: thin SUS with Cu plating thick Cu tube & Cu bellows Short-end plate of doorknob N 2 blow OD = 41 mm 27 mm Zo = 41. 5 W 66 W 1. 0 t, Sus + 10 mm Cu Inner conductor Outer conductor 2. 0 t, Cu Eiji Kako (KEK, Japan) TTC at Cornell, 2013 June 13 9

RF Conditioning of c. ERL Input Couplers Collaboration with HZB/Triumf/KEK 200 k. W, <2

RF Conditioning of c. ERL Input Couplers Collaboration with HZB/Triumf/KEK 200 k. W, <2 ms, 5 Hz (1%) 30~40 k. W, CW Eiji Kako (KEK, Japan) TTC at Cornell, 2013 June 13 10

Further Improvement for efficient cooling by water Outer conductor Inner conductor Water cooling channel

Further Improvement for efficient cooling by water Outer conductor Inner conductor Water cooling channel Water cooling jacket N 2 gas flow Eiji Kako (KEK, Japan) TTC at Cornell, 2013 June 13 11

Further Improvement for efficient cooling by water Inner conductor Eiji Kako (KEK, Japan) Outer

Further Improvement for efficient cooling by water Inner conductor Eiji Kako (KEK, Japan) Outer conductor TTC at Cornell, 2013 June 13 12

Assembly of input couplers for injector cryomodule Eiji Kako (KEK, Japan) TTC at Cornell,

Assembly of input couplers for injector cryomodule Eiji Kako (KEK, Japan) TTC at Cornell, 2013 June 13 13

Conditioning in Cryomodule at R. T. 70 k. W, <0. 2 s, 1 Hz

Conditioning in Cryomodule at R. T. 70 k. W, <0. 2 s, 1 Hz (20%) 20 k. W, CW Eiji Kako (KEK, Japan) TTC at Cornell, 2013 June 13 14

Beam Operation of c. ERL e- beam 5. 0 Me. V 0. 3 m.

Beam Operation of c. ERL e- beam 5. 0 Me. V 0. 3 m. A 10 m. A Beam operation: Eacc = 7. 2, 7. 3, 6. 9 MV/m PRF = 3. 0, 8. 9, 8. 1 k. W /2 QL = 12. 0, 5. 8, 4. 8 x 105 Eiji Kako (KEK, Japan) TTC at Cornell, 2013 June 13 15

Summary and Next Step l KEK injector couplers were conditioned; test stand: 200 k.

Summary and Next Step l KEK injector couplers were conditioned; test stand: 200 k. W (pulse, 1%), 40 k. W (CW) cryomodule: 70 k. W (pulse, 20%), 20 k. W (CW) with beam: stable operation at ~ 5 k. W (CW) l For the future 3 -Ge. V ERL project; Fabrication and conditioning at test-stand of CW 100 k. W level couplers with improved cooling are scheduled. Eiji Kako (KEK, Japan) TTC at Cornell, 2013 June 13 16

END Thank you for your attentions. Eiji Kako (KEK, Japan) TTC at Cornell, 2013

END Thank you for your attentions. Eiji Kako (KEK, Japan) TTC at Cornell, 2013 June 13 17