Shuichi NoguchiTTC Meeting at Milano, 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.

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

Shuichi NoguchiTTC Meeting at Milano, Injector Module Parameters ( 10 MeV, 100 mA ) Frequency1.3 GHz Number of cell / cavity ( & Cavity ) 3 ( 2 )2 ( 4 )2 ( 3 )2 ( 2 )1 ( 4 ) Effective Length34.6 cm23.0 cm 11.5 cm Accelerating Voltage5 MV2.5 MV3.4 MV5 MV2.5 MV Accelerating Gradient14.5 MV/m10.9 MV/m14.7 MV/m21.7 MV/m R/Q 300     Geometrical Factor G   Unloaded Q1x10 10 Cavity Loss8.3 W3.2 W5.8 W12.5 W6.3 W Beam Current100 mA Beam Power500 KW250 KW340 KW500 KW250 KW Number of Input Coupler22222 Optimum Coupler Q1.7x x x x10 5 Half Band Width3.8 kHz5.0 kHz3.8 kHz2.6 kHz Number of HOM Coupler k Load ( static )47 ( 11 ) W59 ( 17 ) W54 ( 14 ) W53 ( 11 ) W63 ( 17 ) W 5k Load ( static )64 ( 22 ) W92 ( 44 ) W75 ( 33 ) W58 ( 22 ) W80 ( 44 ) W 80k Load ( static )233 ( 85 ) W323 ( 155 ) W270 ( 120 ) W213 ( 85 ) W283 ( 155 ) W Injector Module Parameters

Shuichi NoguchiTTC Meeting at Milano, cell x 32k5k80k StaticDynamicStaticDynamicStaticDynamic Cavity 6 W Input Coupler 2 W 6 W 8 W20 W 30 W HOM Cable 1 W4 W (100 W) 5 W 6 W15 W 20 W Sub-Total 3 W 12 W11 W 14 W 35 W 50 W Beam Pipe 4 W 10 W Others 5 W Module Total 14 W 40 W33 W 42 W120W 150 W Heat Load of Cryomodule ( 1 MW )

Shuichi NoguchiTTC Meeting at Milano, Cavity

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

Shuichi NoguchiTTC Meeting at Milano, Prototype 2-cell Cavity

Shuichi NoguchiTTC Meeting at Milano, 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 1.no HOM pick-up probe 2.with 5 HOM pick-up probes Rres=38.6n  (Flange loss: 23n  )

Shuichi NoguchiTTC Meeting at Milano, cell cavities for cERL Cryomodule 9

Shuichi NoguchiTTC Meeting at Milano, Couplers

Shuichi NoguchiTTC Meeting at Milano, Fixed Input Coupler 5k 80k Water Cooling Coaxial Warm Window

Shuichi NoguchiTTC Meeting at Milano, Design & fabrication of input couplers 2K 5K 80K 300K V acc Q L P rf [MV] [x10 5 ] [kW] Cavity Cavity Cavity (Q L /coupler, P rf /coupler, I beam = 10 mA) Extension

Shuichi NoguchiTTC Meeting at Milano, kW CW Klystron Conditioning of input couplers High power test stand Conditioning Results 1s, 0.1Hz, 100kW for 2h cw 30kW for 1.5h cw 50kW for 0.5h cw 100kW for 1 min

Shuichi NoguchiTTC Meeting at Milano, Improved HOM Coupler TESLA Type ERL

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

Shuichi NoguchiTTC Meeting at Milano, ModeFrequencyR / QMeasured Q L TE GHz 0.59  /cm GHz 1.8  /cm TM GHz 4.0  /cm GHz 1.9  /cm TM GHz 64  GHz 12  1200 TM GHz 0.4  2.69GHz 31  HOM Dumping with 5 Couplers

Shuichi NoguchiTTC Meeting at Milano, Tuner

Shuichi NoguchiTTC Meeting at Milano, Slide Jack Tuner 290N/  m Piezo Stack Drive Shaft Taper Invar Rod Roller

Shuichi NoguchiTTC Meeting at Milano, Slid-Jack Tuner Performance CavitySpring ConstantSensitivity 18 N/  m1.3 kHz/  m TunerTypeStroke MechanicalSlid - Jack1.6 mm 2.1 MHz Fine Tuner2 x Piezo ( 1000 V ) ~ 6  m ~ 8 kHz ( 2 x HBW )

Shuichi NoguchiTTC Meeting at Milano, Cryomodule

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

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

Shuichi NoguchiTTC Meeting at Milano, cERL Injector Cryomodule 5k Panel 2k Cold Box

Shuichi NoguchiTTC Meeting at Milano, cERL Injector Cryomodule e-e- Vacuum Vessel Input Coupler Double Feed Cavity 3 x 2-cell 2k Gas Return

Shuichi NoguchiTTC Meeting at Milano, k Panel 5k He Pipe 5k He Panel

Shuichi NoguchiTTC Meeting at Milano, Schedule Calendar Year Cavity Input Coupler Cryostat Module Cooldown Beam VT Jacket Processing Assembly