| 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) |
| 1417 | Begin LHe transfer @ MB = 34.3% |
| 1425 | Fill LN2 cold trap bath |
| | MC/Coldplate = 28.3/145 mK, Still = 1.08 K / 0.100 mbar / 0 mW, G1/G2 = 100.6/101 mbar, 1K Pot = 18° / 1.55 K / 8.0±0.5 mbar, MB = 69.9% |
| | Experimenting with NaI array trigger. We're setting up for a Na-22 coincidence test, situating the source north of the cryostat and level with S104. We will look for Compton scatters in S104 coincident with hits in the NaI detectors on the south side. |
| | Currently the way I'm setting the trigger (because I know it works) is to run scanwindow.exe, which allows setting the detectors to activate and the lower trigger threshold. You can let it run as it scans through increasing upper thresholds until it reaches what you want then stop the program. |
| 1440 | Set NaI detectors 10,11,12 to trigger (these are about level with S104) with threshold range 1300-2100 (roughly equivalent to 950-1745 keV). Count pulses in DCRC4pA to get a NaI trigger rate: 12 triggers in 100 3.2768-ms traces = 37±11 Hz |
| 1455 | MC/Coldplate = 28.2/149 mK, Still = 1.07 K / 0.095 mbar / 0 mW, G1/G2 = 94/111 mbar, 1K Pot = 18° / 1.49 K / 6.5±0.5 mbar |
| | above readings are at end of transfer, several are lower than normal. |
| 1500 | End LHe transfer @ MB = 95.7% |