Injector Cryomodule for c ERL at KEK Cavity

Injector Cryomodule for c. ERL at KEK • • • Cavity Input Coupler HOM Coupler Frequency Tuner Cryostat Shuichi Noguchi 2 Prototypes were tested. 2 Couplers were tested. 9 Couplers were tested. Slide-Jack Tuner. Under Fabrication. TTC Meeting at Milano, 2011. 3. 2 1

Design Specification for 5 Ge. V ERL Injector RF Frequency : 1. 3 GHz Beam Current : 100 m. A c. W Energy : 10 Me. V Beam Power : 1 MW 　　 Shuichi Noguchi TTC Meeting at Milano, 2011. 3. 2 2

Injector Module Parameters ( 10 Me. V, 100 m. A ) Frequency Number of cell / cavity ( & Cavity ) 1. 3 GHz 3(2) 2(4) 2(3) 2(2) 1(4) 34. 6 cm 23. 0 cm 11. 5 cm Accelerating Voltage 5 MV 2. 5 MV 3. 4 MV 5 MV 2. 5 MV Accelerating Gradient 14. 5 MV/m 10. 9 MV/m 14. 7 MV/m 21. 7 MV/m R/Q 300 W 200 W 100 W Geometrical Factor G 280 W 280 W Unloaded Q 1 x 1010 1 x 1010 Cavity Loss 8. 3 W 3. 2 W 5. 8 W 12. 5 W 6. 3 W Beam Current 100 m. A Beam Power 500 KW 250 KW 340 KW 500 KW 250 KW 2 2 2 Optimum Coupler Q 1. 7 x 105 1. 3 x 105 1. 7 x 105 2. 5 x 105 Half Band Width 3. 8 k. Hz 5. 0 k. Hz 3. 8 k. Hz 2. 6 k. Hz 5 5 5 2 k Load ( static ) 47 ( 11 ) W 59 ( 17 ) W 54 ( 14 ) W 53 ( 11 ) W 63 ( 17 ) W 5 k Load ( static ) 64 ( 22 ) W 92 ( 44 ) W 75 ( 33 ) W 58 ( 22 ) W 80 ( 44 ) W 80 k Load ( static ) 233 ( 85 ) W 323 ( 155 ) W 270 ( 120 ) W 213 ( 85 ) W 283 ( 155 ) W Effective Length Number of Input Coupler Number of HOM Coupler Shuichi Noguchi TTC Meeting at Milano, 2011. 3. 2 3

Heat Load of Cryomodule ( 1 MW ) 2 cell x 3 2 k 5 k 80 k Static Dynamic Cavity Input Coupler HOM Cable 2 W 1 W Sub-Total 3 W Beam Pipe Others 5 W Module 14 W Total Shuichi Noguchi 6 W 2 W 6 W 8 W 20 W 30 W 4 W 5 W (100 W) 12 W 11 W 4 W 6 W 15 W 20 W 14 W 35 W 10 W 5 W 120 W 50 W 40 W 33 W 42 W TTC Meeting at Milano, 2011. 3. 2 150 W 4

Cavity Shuichi Noguchi TTC Meeting at Milano, 2011. 3. 2 5

Prototype 2 -cell Cavity Two Input Couplers 3 -HOM Coupler 2 -HOM Coupler STF Dumbbell ( t = 3. 5 mm ) He Jacket End Plate: Ti Shuichi Noguchi TTC Meeting at Milano, 2011. 3. 2 6

Prototype 2 -cell Cavity Shuichi Noguchi TTC Meeting at Milano, 2011. 3. 2 7

Vertical Tests of prototype 2 -cell Cavities ERL prototype 2 -cell #1 Cavity ERL prototype 2 -cell #2 Cavity 2 loop & 2 antenna-type HOM 5 loop-type HOM couplers Rres=38. 6 n (Flange loss: 23 n ) 1. no HOM pick-up probe 2. with 5 HOM pick-up probes Shuichi Noguchi TTC Meeting at Milano, 2011. 3. 2 8 8

2 -cell cavities for c. ERL Cryomodule Shuichi Noguchi TTC Meeting at Milano, 2011. 3. 2 9 9

Couplers Shuichi Noguchi TTC Meeting at Milano, 2011. 3. 2 10

Fixed Input Coupler 80 k Coaxial Warm Window Shuichi Noguchi 5 k Water Cooling TTC Meeting at Milano, 2011. 3. 2 11

Design & fabrication of input couplers Extension 300 K 80 K 5 K 2 K Vacc [MV] QL [x 105] Prf [k. W] Cavity-1 1. 5 10. 10 Cavity-2 2. 5 4. 25 Cavity-3 2. 5 4. 25 (QL /coupler, Prf /coupler, Ibeam = 10 m. A) Shuichi Noguchi TTC Meeting at Milano, 2011. 3. 2 12 12

Conditioning of input couplers 300 k. W CW Klystron High power test stand Shuichi Noguchi • • Conditioning Results 1 s, 0. 1 Hz, 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 TTC Meeting at Milano, 2011. 3. 2 13 13

Improved HOM Coupler TESLA Type Shuichi Noguchi TTC Meeting at Milano, 2011. 3. 2 ERL 14

He Pressure=< 3 k. Pa Flow rate=< 10 m 3/hour 13 MV/m limited by Pick-up Rres=38. 6 n (Flange loss: 23 n ) Shuichi Noguchi TTC Meeting at Milano, 2011. 3. 2 He <2 K 15

HOM Dumping with 5 Couplers Mode Frequency R/Q Measured QL TE 111 1. 57 GHz 0. 59 /cm 2 1000 1. 63 GHz 1. 8 /cm 2 500 1. 80 GHz 4. 0 /cm 2 800 1. 88 GHz 1. 9 /cm 2 1000 2. 28 GHz 64 1000 2. 31 GHz 12 1200 2. 67 GHz 0. 4 2. 69 GHz 31 TM 110 TM 011 TM 020 Shuichi Noguchi TTC Meeting at Milano, 2011. 3. 2 16

Tuner Shuichi Noguchi TTC Meeting at Milano, 2011. 3. 2 17

Slide Jack Tuner 290 N/mm Invar Rod Taper Shuichi Noguchi Drive Shaft Roller Piezo Stack TTC Meeting at Milano, 2011. 3. 2 18

Slid-Jack Tuner Performance Cavity Spring Constant 18 N/mm Tuner Type Mechanical Slid - Jack Sensitivity 1. 3 k. Hz/mm Stroke 1. 6 mm 2. 1 MHz Fine Tuner 2 x Piezo ( 1000 V ) ~ 6 mm ~ 8 k. Hz ( 2 x HBW ) Shuichi Noguchi TTC Meeting at Milano, 2011. 3. 2 19

Cryomodule Shuichi Noguchi TTC Meeting at Milano, 2011. 3. 2 20

c. ERL Injector Cryomodule Input Coupler L-He Level He gas Return Vacuum Vessel He Vessel (Ti) Magnetic Shield L-He HOM Coupler Cavity Ceramic window Shuichi Noguchi TTC Meeting at Milano, 2011. 3. 2 21

c. ERL Injector Cryomodule Input Coupler He gas Return Vacuum Vessel 5 k L-He Panel L-He Level He Vessel HOM Coupler Magnetic Shield Inside L-He Cavity Ceramic window Shuichi Noguchi TTC Meeting at Milano, 2011. 3. 2 22

c. ERL Injector Cryomodule 5 k Panel 2 k Cold Box Shuichi Noguchi TTC Meeting at Milano, 2011. 3. 2 23

c. ERL Injector Cryomodule 2 k Gas Return Input Coupler Double Feed e. Cavity 3 x 2 -cell Vacuum Vessel Shuichi Noguchi TTC Meeting at Milano, 2011. 3. 2 24

5 k Panel 5 k He Pipe Shuichi Noguchi TTC Meeting at Milano, 2011. 3. 2 25

Schedule Calendar Year 2011 Cavity Input Coupler Cryostat Module Cooldown Beam VT Shuichi Noguchi 2012 2013 Jacket Processing Assembly TTC Meeting at Milano, 2011. 3. 2 26