2022/08/05 (Friday)
- Lab in-personnel: Giulia. Derek
| Status | Run 76 in progress |
|---|---|
| Setup | Cables 2/3/1 → diverter/nothing/nothing → Side2-readout HV CONN 1/3/2 → HV 1(L)/2(R) → DCRC50(3)/DCRC55(1), DCRC33(2)→HV control, NaI trigger signal → DCRCX(4) Lead/poly shield fully assembled. Boron-filled socks covering NaI detectors. PuBe behind lead wall on West side of lead/poly shield. |
| Restarted circulation three days ago after a fridge failure (impedance blockage) a week ago. | |
| MC temperature is showing random temperature spikes several minutes apart. Currently the minimum is around 29.6 mK. Most peaks are below 35 mK, though one at 18:45 went to 55 mK and one at 22:45 went to 80 mK and one a bit over 85 mK at 9:32am. | |
| 1338 | MC/Coldplate = 35.1/154 mK, Still = 1.17 K / 0.130 mbar / 0 mW, G1/G2 = 163/155 mbar, 1K Pot = 50° / 1.69 K / 42±2 mbar, MB = 22.5% |
| 1346 | Fill LN2 cold trap bath |
| 1402 | Begin LHe transfer @MB = 22.4% |
| 1446 | End LHe transfer @MB = 90.4% |
| 1500 | We keep seeing spikes in MC temperature, it has been oscillating between 75-33 mK with spikes around 60 mK or above every few minutes |