cavity tuning etc cryogenics cavity tuning tuner input couplers 6 th october 2009 video meeting...
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Cavity tuning etc
CryogenicsCavity tuning
TunerInput couplers
6th October 2009 video meetingK.Nakanishi
Crab Cavity & Coaxial Coupler in Cryo-module
Support Rod
Jacket Type Main He vessel SUS316L
Jacket Type Sub He vessel
Coaxial Coupler (Nb)
Stub Support
Crab Cavity Cell
Notch Filter
Support PipeTuning Rod
RF Absorber
Extract TM010, TE111 ModeFrequency Tuning
Input Coupler
Bellows
KEKB review 2007K.Hosoyama
Main He Vessel
Sub He Vessel
Input Coupler
Stub Support
Coaxial Coupler
Beam
Cooling Water
Liq. He In
Gas He
Cooling He Gas & Cooling Water
RF Monitor Gas He
BellowsRF Absorber
RF Absorber
Cooling Water Cooling Water
Notch Filter
Flow Meter
Control Valve
Cooling Water
KEKB review 2007K.Hosoyama
Ice balls
Pretuningf 0
Expanded length
Pretuning
• The cavity must be expanded about 5mm.• Length of Support lodes should be adjusted.
Support lod
He vessel
Frequency Tuning by Main Tuner by A. Kabe
Main Tuner Position (mm) Main Tuner Position (mm)
Res
onan
ce F
requ
ency
L
oad
[kg]
Tuner
• In KEKB, the tuner stroke is set as 5mm (~100kHz).
• The tuner stroke is limited 10mm(200kHz) by bellows.
• The tuner speed that is limited by motor is about 1kHz/s
Tip of input couplers
prototype HER
It looks good. It’s not shiny.
LER
Some of purple stains were found.
Horizontal testing
Achieved Vkick Applied RF Power
HER 1.8MV 120 kW
LER 1.93MV 55kW
QL
Input power Observation HER(Jun/2006)
HER(Nov/2006)
LER(Dec/2006)
Prototype(Feb/2006)
RF power (1) 10kW Band width 1.59x105 1.66x1051.86x105
1.3x106
RF power (2) 20kW Decay time 1.66x105 1.34x1052.07x105
Simulation (HFSS v9.2) 1.66x105 1.0x106
Q0 values at design kick voltage were higher than 1x109.