Heike R2014-00 R68

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)

TIME TABLE

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

• 29.01.2014 : SECOND DAY - CLEANING & LEAK TEST
  • 08:30 : p_VC~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: Q_L<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

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

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

• XX.XX.2014: THIRD DAY - MIX IN
  • XX:XX : Status = p_VC=??*10^-5mbar, T_MC,RuOx=???, T_MC.Si=??K
  • XX:XX : Start condensing mix. T₁=683mbar, T₂=695mbar, T₃=0mbar, p₄=973mbar.
  • XX:XX : Close Heat-Switch (I_PCS#4=1.5A, I_H=0.5mA) @ T_RuOx=600mK
  • XX:XX : I_Still=3.0mA, T_RuOx=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.