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2 slot cryostat status

2 slot cryostat status. 2 slot cryostat status. Commissioning is underway! 2 Cassettes installed on 3/18. Sensors and control heater mounted. Multi-layer super insulation blankets on. Leak checking of vacuum jacket – passed. Leak checking of cassette space – passed.

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2 slot cryostat status

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  1. 2 slot cryostat status Russ Rucinski, Fermilab, March 29, 2005

  2. 2 slot cryostat status • Commissioning is underway! • 2 Cassettes installed on 3/18. • Sensors and control heater mounted. • Multi-layer super insulation blankets on. • Leak checking of vacuum jacket – passed. • Leak checking of cassette space – passed. • Cryostat is in place and hooked up. Russ Rucinski, Fermilab, March 29, 2005

  3. 2 slot cryostat status • Initial cool down last Friday 3/25. Started late in the day, saw that it would cool, started debugging temperature sensor readout. Ran for 2 hours. Warmed up over the weekend. • Started cooling on Monday 3/28 at 7:30 am, and have been cooling ever since (32 hours now). • Station 1 at 54 K. (more or less stable) • Station 2 at 16.5 K. (slowly decreasing) Russ Rucinski, Fermilab, March 29, 2005

  4. 2 slot cryostat status • Sensors 1 & 2 are redundant 100 Ohm Allen Bradley carbon resistors. They are on stage 2 cold head and thermal link. They agree to a few tenths of a Kelvin. • Sensor 3 is a silicon diode on the upper intercept. • Cooling rate had slowed to -0.1 K/hr earlier today. But now at -0.4 K/hr. Maybe attributed to isolating the vacuum jacket from the turbo cart, or lowering lid heater setpoint by 5 C, or due to something else. Russ Rucinski, Fermilab, March 29, 2005

  5. Commissioning area Russ Rucinski, Fermilab, March 29, 2005

  6. 2 slot cryostat status • Plans • Continue to cool, and obtain coldest temperatures. • Read out cassette temperature sensors independently. • Get heater control loop functioning. • Install low cassette space pressure alarm. • If Problems: • Capacity issue? Run without thermal link to cassette. • Heater attachment location may be suspect. • Sensor self heating issue? • More MLI on sides needed? (shell a few C cold on sides) Russ Rucinski, Fermilab, March 29, 2005

  7. Pictures - Ready for vacuum container Russ Rucinski, Fermilab, March 29, 2005

  8. Cold end pictures Sensor 2, thermal link Sensor 1 – cold end Sensor 3, upper Control heater Russ Rucinski, Fermilab, March 29, 2005

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