1 HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATION KEKB Review Committee/20070319NAKAI Hirotaka KEK...

1HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATION

KEKB Review Committee/20070319 NAKAI Hirotaka

KEKKEK

Crab Cavity- Cryogenics -Crab Cavity

- Cryogenics -

KEKB Crab Cavity Group

- presented by NAKAI Hirotaka

KEKB Crab Cavity Group

- presented by NAKAI Hirotaka



KEKKEK OverviewOverview

Crab cavity cryostat

Calorimetric measurementsStatic heat loss of cryostat

Unloaded Q-factor of crab cavity

Cryogenic system monitoring

Crab cavity cryostat

Calorimetric measurementsStatic heat loss of cryostat

Unloaded Q-factor of crab cavity

Cryogenic system monitoring



KEKKEK

Crab Cavity Cryostat Crab Cavity Cryostat



KEKKEK Cryostat Design ConceptCryostat Design Concept

Jacket-type liquid helium vessels

Coaxial coupler with bellows for frequency tuning

Stub support for long coaxial coupler for mechanical support and cooling of coaxial coupler tip

Jacket-type liquid helium vessels

Coaxial coupler with bellows for frequency tuning

Stub support for long coaxial coupler for mechanical support and cooling of coaxial coupler tip



KEKKEK Cryostat Conceptual DesignCryostat Conceptual Design

Top View RF Input couplerMagnetic Shield (Jacket Type)

80 K Liq. Nitrogen Shield

Coaxial Coupler

Stub Support

Bellows

Liq. HeRF MonitoringPort

Frequency Tuningby Adjusting Distance

Crab Mode Reject Filter(Notch Filter)

HOMAbsorber

I.D. 240 I.D.100

Liq. He

HOMAbsorber



KEKKEK Schematic Drawing of CryostatSchematic Drawing of Cryostat



KEKKEK HER Crab Cavity CryostatHER Crab Cavity Cryostat



KEKKEK LER Crab Cavity CryostatLER Crab Cavity Cryostat



KEKKEK

Calorimetric Measurements Calorimetric Measurements



KEKKEK Heater in Helium JacketHeater in Helium Jacket



KEKKEK Static Loss of CryostatStatic Loss of Cryostat

HER 20061117Heater [W]Duration [min.]Coupler [L/min.]Coax. [L/min.]Bellows [L/min.]Total [L/min.]Q-flow [W]Total Loss [W]Static Loss [W]

0 28 3 139.5 157.5 300 18.6720 20 3 137.5 157.5 298 18.54 50.00 31.4640 15 3 139.0 158.0 300 18.67 46.15 27.480 27 3 137.0 156.0 296 18.42

20 20 3 137.0 157.0 297 18.48 57.14 38.6640 15 3 138.5 158.5 300 18.67 50.00 31.33

Average 18.57 50.82 32.25

LER 20061223Heater [W]Duration [min.]Coupler [L/min.]Coax. [L/min.]Bellows [L/min.]Total [L/min.]Q-flow [W]Total Loss [W]Static Loss [W]

0 32 4 98.7 137.9 240.6 14.9720 21 4 99.5 142.0 245.5 15.28 38.18 22.9040 16 4 101.2 117.2 222.4 13.84 40.00 26.160 32 4 99.3 142.0 245.3 15.26

20 22 4 95.8 149.4 249.2 15.51 44.00 28.4940 16 4 96.5 125.0 225.5 14.03 40.00 25.97

Average 14.82 40.55 25.73

HER 20061117Heater [W]Duration [min.]Coupler [L/min.]Coax. [L/min.]Bellows [L/min.]Total [L/min.]Q-flow [W]Total Loss [W]Static Loss [W]

0 28 3 139.5 157.5 300 18.6720 20 3 137.5 157.5 298 18.54 50.00 31.4640 15 3 139.0 158.0 300 18.67 46.15 27.480 27 3 137.0 156.0 296 18.42

20 20 3 137.0 157.0 297 18.48 57.14 38.6640 15 3 138.5 158.5 300 18.67 50.00 31.33

Average 18.57 50.82 32.25

LER 20061223Heater [W]Duration [min.]Coupler [L/min.]Coax. [L/min.]Bellows [L/min.]Total [L/min.]Q-flow [W]Total Loss [W]Static Loss [W]

0 32 4 98.7 137.9 240.6 14.9720 21 4 99.5 142.0 245.5 15.28 38.18 22.9040 16 4 101.2 117.2 222.4 13.84 40.00 26.160 32 4 99.3 142.0 245.3 15.26

20 22 4 95.8 149.4 249.2 15.51 44.00 28.4940 16 4 96.5 125.0 225.5 14.03 40.00 25.97

Average 14.82 40.55 25.73



KEKKEK Unloaded Q-Factors of HERUnloaded Q-Factors of HER

108

109

1010

0.0 0.5 1.0 1.5 2.0 2.5 3.0

HER

2006061420061115200611162006111720051220(Vertical Meas.)

Vkick

[MV]

Operation Voltage

108

109

1010

0.0 0.5 1.0 1.5 2.0 2.5 3.0

HER

2006061420061115200611162006111720051220(Vertical Meas.)

Vkick

[MV]

Operation Voltage



KEKKEK Unloaded Q-Factors of LERUnloaded Q-Factors of LER

108

109

1010

0.0 0.5 1.0 1.5 2.0 2.5 3.0

LER

200612222006122320060113(Vertical Meas.)

Vkick

[MV]

Operation Voltage

108

109

1010

0.0 0.5 1.0 1.5 2.0 2.5 3.0

LER

200612222006122320060113(Vertical Meas.)

Vkick

[MV]

Operation Voltage



KEKKEK

Monitoring Devices in Cryogenic System

Monitoring Devices in Cryogenic System



KEKKEK Monitoring DevicesMonitoring Devices

ThermometersPlatinum-Cobalt alloy resistance thermometer (Pt-Co RTD) for liquid helium temperature

Copper-Constantan thermocouple for liquid nitrogen temperature

Superconducting liquid helium level sensor

Pressure transducer

Heater for heat load compensation

Vacuum gaugesCold cathode gauge (CCG)

Pirani gauge

ThermometersPlatinum-Cobalt alloy resistance thermometer (Pt-Co RTD) for liquid helium temperature

Copper-Constantan thermocouple for liquid nitrogen temperature

Superconducting liquid helium level sensor

Pressure transducer

Heater for heat load compensation

Vacuum gaugesCold cathode gauge (CCG)

Pirani gauge



KEKKEK Devices in Helium JacketsDevices in Helium Jackets

Liquid HeliumLevel Sensor

Helium JacketPressure Transducer

Helium JacketHeater

Heater Temperature(Thermocouple)

Helium JacketHeater

Heater Temperature(Thermocouple)

Helium JacketTemperature (Pt-Co RTD)

Cavity Temperature(Pt-Co RTD)

Helium JacketTemperature (Pt-Co RTD)



KEKKEK Devices in Vacuum VesselDevices in Vacuum Vessel

Small Beam PipeTemperature(Thermocouple)

Liquid Nitrogen Outlet Temperature(Thermocouple)

Liquid Nitrogen Inlet Temperature(Thermocouple)

Large Beam PipeTemperature(Thermocouple)

Coaxial Coupler Tubing Temperature(Pt-Co RTD)

Bellows TubingTemperature(Pt-Co RTD)

Input Coupler FlangeTemperature(Pt-Co RTD)



KEKKEK Devices at External TubingDevices at External Tubing

Input Coupler Cooling Gas Temperature(Thermocouple)

Bellows Cooling Gas Temperature(Thermocouple)

Coaxial Coupler Cooling Gas Temperature(Thermocouple)

Safety ValveTemperature(Thermocouple)

Rapture ValveTemperature(Thermocouple)



KEKKEK Display of Control SystemDisplay of Control System



KEKKEK SummarySummary

Crab cavity cryostats manufactured successfully and connected to the refrigeration system

Calorimetric measurements carried outModerate heat load to cryostats

Cavity performance not so degraded during installation to the cryostat

Monitoring devices equipped and work properly

Crab cavity cryostats manufactured successfully and connected to the refrigeration system

Calorimetric measurements carried outModerate heat load to cryostats

Cavity performance not so degraded during installation to the cryostat

Monitoring devices equipped and work properly

1 HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATION KEKB Review Committee/20070319NAKAI Hirotaka KEK...

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