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Injector Cryomodule for cERL at KEK

This document discusses the design specifications and prototypes of the injector cryomodule for the cERL project at KEK. It includes information on the tested cavity, input couplers, HOM couplers, frequency tuner, cryostat under fabrication, and more.

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Injector Cryomodule for cERL at KEK

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  1. Injector Cryomodule for cERL at KEK • Cavity 2 Prototypes were tested. • Input Coupler 2 Couplers were tested. • HOM Coupler 9 Couplers were tested. • Frequency Tuner Slide-Jack Tuner. • Cryostat Under Fabrication. TTC Meeting at Milano, 2011.3.2

  2. Design Specification for 5GeV ERL Injector RF Frequency : 1.3 GHz Beam Current : 100 mA cW Energy : 10 MeV Beam Power : 1 MW TTC Meeting at Milano, 2011.3.2

  3. Injector Module Parameters TTC Meeting at Milano, 2011.3.2

  4. Heat Load of Cryomodule ( 1 MW ) TTC Meeting at Milano, 2011.3.2

  5. Cavity TTC Meeting at Milano, 2011.3.2

  6. Prototype 2-cell Cavity Two Input Couplers 3-HOM Coupler 2-HOM Coupler STF Dumbbell ( t = 3.5 mm ) He Jacket End Plate:Ti TTC Meeting at Milano, 2011.3.2

  7. Prototype 2-cell Cavity TTC Meeting at Milano, 2011.3.2

  8. Vertical Tests of prototype 2-cell Cavities ERL prototype 2-cell #1 Cavity 2 loop & 2 antenna-type HOM ERL prototype 2-cell #2 Cavity 5 loop-type HOM couplers Rres=38.6n(Flange loss: 23n) • no HOM pick-up probe • with 5 HOM pick-up probes 8 TTC Meeting at Milano, 2011.3.2

  9. 2-cell cavities for cERL Cryomodule 9 TTC Meeting at Milano, 2011.3.2

  10. Couplers TTC Meeting at Milano, 2011.3.2

  11. Fixed Input Coupler 5k 80k Water Cooling Coaxial Warm Window TTC Meeting at Milano, 2011.3.2

  12. Design & fabrication of input couplers Extension 300K 80K Vacc QL Prf [MV] [x105] [kW] Cavity-1 1.5 10. 10 Cavity-2 2.5 4. 25 Cavity-3 2.5 4. 25 5K 2K (QL /coupler, Prf /coupler, Ibeam = 10 mA) 12 TTC Meeting at Milano, 2011.3.2

  13. Conditioning of input couplers 300kW CW Klystron • Conditioning Results • 1s, 0.1Hz, 100kW for 2h • cw 30kW for 1.5h • cw 50kW for 0.5h • cw 100kW for 1 min High power test stand 13 TTC Meeting at Milano, 2011.3.2

  14. Improved HOM Coupler ERL TESLA Type TTC Meeting at Milano, 2011.3.2

  15. He Pressure=< 3 kPa Flow rate=< 10 m3/hour 13 MV/m limited by Pick-up Rres=38.6n(Flange loss: 23n) He <2K TTC Meeting at Milano, 2011.3.2

  16. HOM Dumping with 5 Couplers TTC Meeting at Milano, 2011.3.2

  17. Tuner TTC Meeting at Milano, 2011.3.2

  18. Slide Jack Tuner 290N/mm Drive Shaft Invar Rod Piezo Stack Taper Roller TTC Meeting at Milano, 2011.3.2

  19. Slid-Jack Tuner Performance TTC Meeting at Milano, 2011.3.2

  20. Cryomodule TTC Meeting at Milano, 2011.3.2

  21. cERL Injector Cryomodule Vacuum Vessel Input Coupler He gas Return L-He Level He Vessel (Ti) Magnetic Shield HOM Coupler L-He Cavity Ceramic window TTC Meeting at Milano, 2011.3.2

  22. cERL Injector Cryomodule Input Coupler He gas Return Vacuum Vessel 5k L-He Panel L-He Level He Vessel HOM Coupler Magnetic Shield Inside Cavity L-He Ceramic window TTC Meeting at Milano, 2011.3.2

  23. cERL Injector Cryomodule 5k Panel 2k Cold Box TTC Meeting at Milano, 2011.3.2

  24. cERL Injector Cryomodule 2k Gas Return Input Coupler Double Feed e- Cavity 3 x 2-cell Vacuum Vessel TTC Meeting at Milano, 2011.3.2

  25. 5k Panel 5k He Panel 5k He Pipe TTC Meeting at Milano, 2011.3.2

  26. Schedule Jacket VT Processing Assembly TTC Meeting at Milano, 2011.3.2

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