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Crab Cavity - Cryogenics -

Explore the design concept, calorimetric measurements, and monitoring devices used in the cryostat for Crab Cavity applications. Learn about the successful manufacturing and performance of the cryostats.

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Crab Cavity - Cryogenics -

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  1. Crab Cavity- Cryogenics - KEKB Crab Cavity Group - presented by NAKAI Hirotaka

  2. Overview • Crab cavity cryostat • Calorimetric measurements • Static heat loss of cryostat • Unloaded Q-factor of crab cavity • Cryogenic system monitoring

  3. Crab Cavity Cryostat

  4. Cryostat 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

  5. RF Input coupler Top View Frequency Tuning by Adjusting Distance Magnetic Shield (Jacket Type) Stub Support HOM Absorber HOM Absorber I.D. 240 Coaxial Coupler I.D.100 Bellows Crab Mode Reject Filter (Notch Filter) Liq. He RF Monitoring Port Liq. He 80 K Liq. Nitrogen Shield Cryostat Conceptual Design

  6. Schematic Drawing of Cryostat

  7. HER Crab Cavity Cryostat

  8. LER Crab Cavity Cryostat

  9. Calorimetric Measurements

  10. Heater in Helium Jacket

  11. Static Loss of Cryostat

  12. Unloaded Q-Factors of HER

  13. Unloaded Q-Factors of LER

  14. Monitoring Devices in Cryogenic System

  15. Monitoring Devices • Thermometers • Platinum-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 gauges • Cold cathode gauge (CCG) • Pirani gauge

  16. Devices in Helium Jackets Helium Jacket Pressure Transducer Liquid Helium Level Sensor Heater Temperature (Thermocouple) Cavity Temperature (Pt-Co RTD) Heater Temperature (Thermocouple) Helium Jacket Heater Helium Jacket Temperature (Pt-Co RTD) Helium Jacket Temperature (Pt-Co RTD) Helium Jacket Heater

  17. Devices in Vacuum Vessel Liquid Nitrogen Inlet Temperature (Thermocouple) Liquid Nitrogen Outlet Temperature (Thermocouple) Input Coupler Flange Temperature (Pt-Co RTD) Bellows Tubing Temperature (Pt-Co RTD) Small Beam Pipe Temperature (Thermocouple) Large Beam Pipe Temperature (Thermocouple) Coaxial Coupler Tubing Temperature (Pt-Co RTD)

  18. Devices at External Tubing Input Coupler Cooling Gas Temperature (Thermocouple) Safety Valve Temperature (Thermocouple) Coaxial Coupler Cooling Gas Temperature (Thermocouple) Rapture Valve Temperature (Thermocouple) Bellows Cooling Gas Temperature (Thermocouple)

  19. Display of Control System

  20. Summary • Crab cavity cryostats manufactured successfully and connected to the refrigeration system • Calorimetric measurements carried out • Moderate heat load to cryostats • Cavity performance not so degraded during installation to the cryostat • Monitoring devices equipped and work properly

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