2021/08/12 (Thursday)
- Lab in-personnel: Giulia and Matt
| 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. Currently both DCRCs are on. | |
| Position of Am source: y = 0.00 mm | |
| 1008 | Tower/MC/Coldplate = 180.7/35.9/ 191.8 mK, Still = 1.38 K / 0.075 mbar / 0 mW, G1/G2= 263.7/247.5 mbar, 1K Pot = 1.59 K / 20±1 mbar. MB = 37.7%. |
| 1019 | Fill LN2 cold bath. |
| 1115 | At 10kHz noise in DCRC3qI/qO/DCRC1qI/qO = 30/4.4/3.4/86 8e-6. This is q3/q1/q4/q2 At 3kHz (peak) noise in DCRC3qI/qO/DCRC1qI/qO = 650/58/72/910e-6 |
| 1329 | Start 48 min series of 0V/-12V (bias applied after 60 sec), with Na-22 source at 40 cm, with 1000 beginning randoms, trigger threshold 150/40/70/250 on DCRC3qI/qO/DCRC1qI/qO, 5Hz in-run randoms, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). Start sequence with Start button. |
| 1420 | Dial HV to 0V and flash detector for 10 minutes |
| 1607 | Begin LHe transfer @ MB = 24.6% |
| 1638 | End LHe transfer @ MB = 91.2% |
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| 07210812_1329 |