UMN CDMS Wiki archive
start › cdms › k100 › run_diary › 20210705

2021/07/05 (Monday)

Previous Day

  • Lab in-personnel: Derek
Status Run 74 in progress. First cooldown after IVC rebuild.
Tower thermometer is reading high, probably this is a thermometer problem and the actual temperature is much lower. High noise in some of the charge channels.
Setup: DIB1/2+acc → SL 41/43 → 3.2 MHz filters → cables 2/3 → nothing/Source_mover_board+HV_diverter_board → DCRC50(3)/55(1). Kepco 40V supplye → HV BNC. No lead/poly shield. (DCRCs on overnight - currently source mover board is disconnected)
1320 LN2 Dewar is empty. Fill that from station upstairs. Will start LHe transfer once that is finished.
1332 Tower/MC/Coldplate = 121/31.8/189 mK, Still = 1.34 K / 0.075 mbar / 0 mW, G1/G2= 224/209 mbar, 1K Pot = 1.63 K / 20±2 mbar. MB = 26.2%
1400 Noticed dewar vent valve was stuck during fill caused, it to move slowly. Closing and re-opening the valve seems to have fixed the issue.
1448 Fill LN2 cold trap bath.
1510 Begin LHe transfer, MB = 22.9%
1546 End LHe transfer, MB = 85.6%

Next Day