Heike R2010-11 R65

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 R_STILL=1.13k${\Omega }$.
• New Noise-Thermometer mounted on Demag-Stage read out by two Squids.

Summary

• 30.11.11: CLOSING AND PRECOOLING
  • 10:30 : Start closing Cryo
  • 14:00 : Dewar closed , start pumping dewar. All lines pumped, all pumps tested.
  • Exchange gas: p_VC=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! (T_Dewar=78K, T_MC,Si-Diode=253K, p_VC=3.89mbar, T_Magn,u.=233)

• 01.12.11: START COOLING WITH LHe
  • 08:00 : Status: T_Dewar=225K, T_MC,Si-Diode=221K, p_VC=3.4mbar, T_Magn,u.=230K. Continue filling with LN until T_Dewar=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 (T_Dewar=121K, T_MC,Si-Diode=206K, p_VC=3mbar, T_Magn,u.=176K)

Checking Filterboxes

• done!
• details will be added :)