Heike R2012-09 R67: Difference between revisions

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* 07.09.2012: Degauss FPD, see log-book at page 234.
* 07.09.2012: Degauss FPD, see log-book at page 234.
* Testing new noise thermometer ...
* Testing new noise thermometer ...



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Revision as of 16:59, 17 September 2012

NEW

  • Renewed and improved noise thermometer.
  • The wiring for four Double-Channel-Squids is installed.
  • Two more stainless steel Coax-Cables are installed with their own port at room-temperature. The are numbered #5 and #6. Up to now they end at the mixing chamber and are connected to each other.
  • Two semi-rigid coax-cables were installed, too.
  • Filter-boxes I, II and VI were improved by adding a second coil at the input (cryo-end) of the filter circuit. The coils were manufactured by WĆ¼rth Electronik, Part No. 744221, 2000H; 600mA; 0.42


TEST

  • 07.09.2012: Degauss FPD, see log-book at page 234.
  • Testing new noise thermometer ...


TIME TABLE

  • 30.08.2012: FIRST DAY - CLOSING, CLEANING & PRE-COOLING
    • Closing cryostat and dewar. Cleaning/pumping lines.
    • Exchange gas pVC~3mbar.
    • 17:57 : Pre-cooling with 50l LN.


  • 31.08.2012: SECOND DAY - LIQUID HELIUM
    • 09:00 : Status = TDewar=155K, TMagn,l=152K, pVC=0.78mbar
    • 10:00 : Start filling LHe
    • 15:10 : During 3rd can (after ~ 230 LHe in total): TRuOx=4.6K, pVC=3.3*10-3mbar
    • 15:58 : Pump VC
    • 17:15 : He 100%, LHe in total ~318l
    • 18:45 : Stop pumping VC, pVC=4.7*10-5mbar


  • 07.09.2012: THIRD DAY - MIX IN
    • 09:25 : Status = pVC=2.9*10-5mbar, TMC,RuOx=4.08, TMC.Si=4.17K
    • 09:40 : Start condensing mix. T1=683mbar, T2=695mbar, T3=0mbar, p4=973mbar.
    • 12:30 : Close Heat-Switch (IPCS#4=1.5A, IH=0.5mA) @ TRuOx=600mK
    • 12:40 : IStill=3.0mA, TRuOx=580mK
    • 14:30 : All mix is in, all pumps are running.

TO DO