2021/03/18 (Thursday)
- Lab in-person: Derek
- Virtual partner: Matt
| Status | Run 74 in progress. |
|---|---|
| Setup: DIB1/2+acc → SL 41/43 → 3.2 MHz filters → cables 2/3 → nothing/HV_diverter_board → DCRC50(3)/55(1). Kepco 0-40V supply → HV BNC. No lead/poly shield. | |
| 0732 | MB = 53.5% |
| 0825 | Tower = 91.8 mK |
| 0830 | Noise in DCRC3qI/qO/DCRC1qI/qO = 1.9/1.3/4.6/1.5 e-6 @ 10 kHz |
| 1432 | MB = 42.5% |
| 1448 | Derek enters lab. |
| 1450 | Tower/MC/Coldplate = 90.4/35.4/186 mK, Still = 1.44 K / 0.130 mbar / 0 mW, G1/G2 = 387/343 mbar, 1K Pot = 1.68 K / 40±2 mbar. |
| 1455 | Start 31min series of +10V/-10V data (bias applied after 1 min), with 1000 beginning randoms, trigger threshold off/off/80/off on DCRC3qI/qO/DCRC1qI/qO, no in-run randoms, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). Start data with Start button on main page |
| Triggers look fine. Noise doesn't look too bad. No temperature increase like the one we saw yesterday. | |
| Actually there was a temperature increase. It began to increase at 15:00, so 5 minutes after the bias was applied. (Could it actually have been caused by the LN2 transfer??) Tower temperature didn't rise very much, 90.5→92.0 mK over 9 minutes. It peaked there then fell a bit over 3 minutes, then beginning at 15:12 (17 minutes into the series) it rose again, rising to 96.0 mK and leveling off by the end of the series. | |
| 1500 | Fill LN2 cold trap bath. |
| 1501 | MB = 41.8% |
| 1542 | Begin LHe transfer @ MB = 41.0% |
| 1608 | End LHe transfer |
| 1614 | MB = 90.3% |