UMN CDMS Wiki archive
start › cdms › k100 › run_diary › 20201109

2020/11/09 (Monday)

Previous Day

  • Lab in-person: Ruiren
  • Virtual partner: Derek
Status End of Run 73 warmup. 1K Pot pumped out, presumably dry, and isolated. All mixture in dump. Fridge and 4He trap isolated. Recovery valve closed. N2 gas in IVC and cryostat vacuum jacket.
0800 MC(Cernox)/Sorb = 236.5/>250 K
0840 MC(Cernox) = 237.4 K. Assuming room temperature of 295 K this suggests tau_warming = 37.6 hours. That's pretty slow. Assuming dew point of 279 K (that's guessing lab humidity of 35%) fridge will reach dew point Wednesday morning.
1000 Ruiren temperature 36.6 C
1420 Ruiren enters lab
1430 Move lead from shield into LIGO lab
1500 Ruiren leaves lab
1600 MC(Cernox) = 248.4 K. Looks like tau_warming is faster now, 32.7 hours. Should reach dew point in wee hours Tuesday night.

Next Day