| Status: | Cooling to base. Tower cooldown is very slow. |
| note: | Daylight Saving time started this morning. |
| 1150 | Tower/MC/Coldplate = 57.8/31.7/192 mK, Still = 1.68±0.02 K / 0.150 mbar, G1/G2 = 157/154 mbar, 1K Pot = 1.79 K / 20 mbar. MB = 25.7% |
| 1212 | Begin LHe transfer @ MB = 25.4% |
| 1225 | Fill LN2 cold trap bath |
| 1250 | End LHe transfer @ MB = 91.4% |
| | Tower temperature spiked at beginning and end of transfer, but as with the last transfer it seems to have given a boost to the cooldown, seems to be below the trendline now. |
| | There may be a problem with He recovery. During the boiloff since the last transfer, the meter hardly moved. This is unusual. It seemed to work fine during the transfer today. Noticed that the helium bag at the liquefier is very full. Could the pressure in the recovery system be too high? Checked a gauge by the bag - looks like a little less than 2 PSI, not super high. |
| 1345 | Tower/MC/Coldplate = 57.1/31.0/189 mK, Still = 1.66±0.02 K / 0.150 mbar, G1/G2 = 170/164 mbar, 1K Pot = 1.77 K / 19 mbar |