Heike R2010-11 R65

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NEW

  • Squid-Wiring for one two-stage Squid
  • Two Lemo plugs and four coax-feedthroughs on top of cryostat.
  • RuOx-000 Thermometer on lower MC platform.
  • New Still-heater!! old one was broken? New resitance RSTILL=1.13k.
  • New Noise-Thermometer mounted on Demag-Stage read out by two Squids.


Tests


Summary

  • 30.11.11: 1st DAY - CLOSING AND PRECOOLING
    • 10:30 : Start closing Cryo
    • 14:00 : Dewar closed , start pumping dewar. All lines pumped, all pumps tested.
    • Exchange gas: pVC=10mbar.
    • 15:00 : Start filling nitrogen
    • 17:12 : Dewar Pt-100 shows LN. Continue filling.
    • 17:45 : LN vessel remains connected with the cryostat during the night but without any pressure, atmosphere-valve of LN can is open! (TDewar=78K, TMC,Si-Diode=253K, pVC=3.89mbar, TMagn,u.=233)
  • 01.12.11: 2nd DAY - START COOLING WITH LHe
    • 08:00 : Status: TDewar=225K, TMC,Si-Diode=221K, pVC=3.4mbar, TMagn,u.=230K. Continue filling with LN until TDewar=78K, continue for 5 minutes.
    • 10:45 : Pump dewar (-0.8bar), float with He from recovery line
    • 11:00 : 1st can of LHe connected, start 1K-pump (TDewar=121K, TMC,Si-Diode=206K, pVC=3mbar, TMagn,u.=176K)
    • 13:30 : 2nd can. By a mistake there was only 16 litres of He taken out of the 1st can!
    • 16:00 : 3rd can. 95 litres were taken from 2nd can.
    • 17:30 : Liquid Helium in Dewar! RDewar=0.92!, TMC,Si-Diode=58K, pVC=0.24mbar (=7.2K), TMagn,u.=7K
    • 18:00 : 4th can. 70 litres were taken from 3rd can.
    • 18:30 : 4K! TMC,Si-Diode=4.1K, pVC=4.3E-03mbar, RMC,CT=275.
    • 19:15 : Disconnect 4th can, 91 litres were taken. RMC,CT=275, pVC=4.1E-03mbar,

-> He consumption: ~272 litres!

  • 02.12.11: 3rd DAY - 4K
    • 08:15 : TMC,Si-Diode=4.1K, RMC,CT=276, pVC=4.8E-03mbar.
    • 08:50 : Pump exchange gas
    • 14:20 : 5th can. After 10 min. first value displayed on He-levelmeter.
    • 15:20 : Stop He-transfer, levelmeter shows 100% (98 litres of He transferred)
    • 15:55 : Stop pumping exchange gas, pVC=1.7E-05mbar.


Checking Filterboxes

  • done!
  • details will be added :)