Heike R2012-02 R66

NEW

• Pt-NMR read-out via two s.s. mini-coax. Signal Coil is connected with port #1 and #3.

TEST

• Testing Pt-NMR. Coax #1 and #3 is connected with a special box. Inside this box the inner conductor of coax #1 is grounded and the inner conductor of #3 is feed through. For details see Pt-NMR Log-Book page 20. At first glance it seems like the device works at Curie-Mode.

TIME TABLE

Icy transfer tube with a sub-prime vacuum :)

• 28.02.2012: FIRST DAY - CLOSING, CLEANING & PRECOOLING
  • Closing cyrostat and dewar. Cleaning/pumping lines.
  • Precooling with 50l LN.

• 29.02.2012: SECOND DAY - LIQUID HELIUM
  • 07:50 : Status = T_Dewar=207K, T_MC,Si=216K, T_Magn,l=217K, p_VC=2.15mbar
  • 09:55 : Start filling LHe
  • 17:00 : Status after two cans (188.8l LHe) =T_MC,Si=80K, T_Magn,u=50K, p_VC=0.45mbar

• 01.03.2012: THIRD DAY
  • 08:00 : Status = T_Dewar=78K, T_MC,Si=80K, T_Magn,u=81K, p_VC=0.67mbar, connect 3^rd can LHe
  • 11:45 : T_MC,Si=4K, start pumping vacuum vessel.
  • 14:00 : Start condensing mix. T₁=688mbar, T₂=700mbar, T₃=0mbar, p₄=774mbar.
  • 14:10 : 100% He-Level. Total consumption to reach this level: 428.2 litres (Five cans) .
  • 16:20 : Close Heat-Switch (I_PCS#4=1.5A, I_H=0.5mA) @ T_RuOx=700mK
  • 17:20 : All mix is in, all pumps are running. I_STILL=3.0mA, T_RuOx=90mK

• 02.03.2012: 4^th DAY
  • Testing FPD
  • Connecting and Testing Pt-NMR