2021/07/27 (Tuesday)
- Lab in-personnel:Pramod and Giulia
| 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 supply → HV BNC. No lead/poly shield. Currently both DCRCs are on. | |
| 1109 | Tower/MC/Coldplate = 220/35.2/ 185 mK, Still = 1.31 K / 0.075 mbar / 0 mW, G1/G2= 271.8/251.1 mbar, 1K Pot = 1.62 K / 20±1 mbar. MB = 29.4%. |
| Tower particularly high today (but little down than yesterday (277 mK). | |
| 1115 | Fill LN2 cold trap bath. |
| 1156 | At 10kHz noise in DCRC3qI/qO/DCRC1qI/qO = 21.8/3.7/3.9/47.8 e-6. This is q3/q1/q4/q2 At 3kHz (peak) noise in DCRC3qI/qO/DCRC1qI/qO = 390/56/91/2089 e-6 |
| These are little bit low than yesterday, but not much improved. | |
| 1245 | Aborted series, saw that the bias was not actually appiled, since of wires from the voltage was from the same +terminal (bias applied after 60 sec), with 1000 beginning randoms, trigger threshold 130/60/50/370 on DCRC3qI/qO/DCRC1qI/qO, 5Hz in-run randoms, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). |
| 1333 | Start 45 min series of 0V/-15V (bias applied after 60 sec), Tower @ 232 mK, with 1000 beginning randoms, trigger threshold 130/60/50/370 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. |
| 1513 | Begin LHe transfer @ MB = 22.8% |
| 1600 | End LHe transfer @ MB = 87.7% |
| 1646 | Flash detector for 60 sec. |
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| 07210727_1333 |