2022/11/04 (Friday)
- Lab in-personnel: Matt
| 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 W side of fridge. NaI scan in progress, not set up for coincidence data |
| Warmed up yesterday for twentieth 5K pumpout. Pumping IVC overnight. | |
| 1110 | Turbo on IVC = 1.0 nbar. With Turbo valved out for 1 minute IVC = 10 nbar. |
| We're going to do another experiment. Like last time we will leave the IVC closed at >5K for a day before cooling. But this time I'll pump the mixture to the dump first, rather than leaving it in the fridge. | |
| 1115 | Fill LN2 cold trap bath |
| 1115 | Pump mixture out of fridge and into dump and cold LN2 Trap 1. V13a, V9, V3, V1 open, V12a+speedivalve closed. Turn on 3He pump and open V6→13%. This pumps out of fridge from both Still and Condenser sides and into dump+cold trap. With G1<5 mbar, increase V6 to 15%. |
| pumping out mixture has a small cooling effect, MC 6.1→5.8 K, 1K Pot briefly dips below 7K, Sorb dips below 10K but then rises again. | |
| 1125 | G1(condenser) = 0.5 mbar, P1(still) = 0.18 mbar, G2(dump+trap) = 672 mbar. Stop pumping out fridge: close V6, wait till fully closed, turn off 3He pump. |
| 1125 | Turbo on IVC = 1.0 nbar. With Turbo valved out for 1 minute IVC = 10 nbar. Same as before. |
| 1130 | Close IVC valves on top of fridge |
| 1204 | Begin LHe transfer @ MB = 0.9% |
| 1254 | End LHe transfer @ MB = 95.6% |