Heike R2014-00 R68

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First RUN since more than one year!!!

NEW

  • New Switch & Relay Box for a easier and better operation of the persistent current switches of the current lines and both magnets.
  • HF coax wiring for the Paddle experiment: Two Semi rigid coax cables(Type: SC-160/50-NbTi-NbTi) connecting the experiment mounted underneath the Cu-Stage with the heat sinks at the mixing chamber (Coax #5 & #6). With the help of an "extender", made of a long silver rod, the experiment is placed in the centre of the lower magnet and can be exposed to a magnetic field up to 9T.
  • HF coax wiring for the Echo experiment leading from the heat sink at 4K (Coax #2 & #4) to a heat sink at the mixing chamber. The Echo Experiment is mounted on the top side of the Cu-Stage and connected with superconducting semi rigid coax cables (Type: SC-160/50-NbTi-NbTi) with this heat sink.


EXPERIMENTS

  • Thermometry: Noise Thermometer and Pt-NMR Thermometer
  • Paddle Experiment: Zr55Cu30Al10Ni5 (M. Hempel)
  • Echo Experiment: BK-7 (M. Wolter)


TEST


TIME TABLE

  • 28.01.2014: FIRST DAY - CLOSING
    • Closing cryostat.
    • 15:30 : Start pumping VC with VP.
    • 17:40 : Stop pumping VC, VP off: pVC~0.3mbar. Close valves, stop pump.


  • 29.01.2014 : SECOND DAY - CLEANING & LEAK TEST
    • 08:30 : pVC~3.2mbar.
    • 09:45 : Start pumping VC again for leak testing.
    • 10:30 : Cleaning cooling water circulation since it's blocked again ... :(
    • 14:50 : Leak Test: QL<10-10mbar*l/sec (with DP running)
    • 15:00 : Cleaning/pumping lines.
    • 16:00 : Start pumping VC with DP
    • 19:00 : Stop pumping VC, DP off: 2*10-3mbar

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX


    • XX:XX : Exchange gas pVC~3mbar.
    • XX:XX : Pre-cooling with 50l LN.


    • XX:XX : Status = TDewar=??K, TMagn,l=???K, pVC=??mbar
    • XX:XX : Start filling LHe
    • XX:XX : During 3rd can (after ~ 230 LHe in total): TRuOx=4.6K, pVC=3.3*10-3mbar
    • XX:XX : Pump VC
    • XX:XX : He 100%, LHe in total ~????l
    • XX:XX : Stop pumping VC, pVC=??*10-5mbar


  • XX.XX.2014: THIRD DAY - MIX IN
    • XX:XX : Status = pVC=??*10-5mbar, TMC,RuOx=???, TMC.Si=??K
    • XX:XX : Start condensing mix. T1=683mbar, T2=695mbar, T3=0mbar, p4=973mbar.
    • XX:XX : Close Heat-Switch (IPCS#4=1.5A, IH=0.5mA) @ TRuOx=600mK
    • XX:XX : IStill=3.0mA, TRuOx=580mK
    • XX:XX : All mix is in, all pumps are running.


  • XX.XX.XX: - RAMP MAGNET


  • XX.XX.XX: - DEMAG



  • XX.XX.XX: MIX OUT
    • XX:XX : Start filling mix into the tanks.

TO DO