2021/08/04 (Wednesday)
- Lab in-personnel: Giulia
| Status | Run 74 in progress. First cooldown aftr 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. | |
| 0930 | Tower/MC/Coldplate = 212.5/36.6/197.3 mK, Still = 1.41 K / 0.075 mbar / 0 mW, G1/G2= 274.1/247.2 mbar, 1K Pot = 1.61 K / 20±1 mbar. MB = 34.3 %. |
| 0948 | Fill LN2 cold trap bath. |
| 1316 | At 10kHz noise in DCRC3qI/qO/DCRC1qI/qO = 30/4.2/3.6/85e-6. This is q3/q1/q4/q2 At 3kHz (peak) noise in DCRC3qI/qO/DCRC1qI/qO = 740/111/73/2060 e-6 |
| 1419 | Start 45 min series of 0V/-12V (bias applied after 60 sec), with 1000 beginning randoms, trigger threshold 150/50/40/700 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. |
| 1504 | Dial bias down to 0V and flash detector for 10 minutes |
| 1521 | Begin LHe transfer @ MB = 25.6% |
| 1601 | End LHe transfer @ MB = 90.2% |
 |
| 07210804_1419 |