2020/03/16 (Monday)
| Setup | Run 72. DIB 1/3/4 → Stripline 43/41/48 → Cable 3/2/1 → nothing/nothing/accessory_interposer → HV_Conn 1/3/2 → HV 1/2 → DCRCX(4)/DCRC55(1). Lead/poly shield erected (4 lead walls, 2 poly walls). |
|---|---|
| Status | Second Run 72 circulation attempt yesterday failed, helium in IVC. Warming up again. Some helium in IVC and cryostat vacuum jacket. 1K Pot needle valve open. All mixture in dump. LN2 Trap 1 needs to be cleaned. MB recovery valve open. New helium cylinder ordered, should pick it up from gas room. Plan is to try to fix leak at top of stripline tube. |
| 0402 | Recovery meter = 343770 cuft (at 4:02:13). Rate = 0.73 cuft/hour |
| 0835 | MC(Cernox)/Sorb = 95/173 K. G1/P1(fridge) = 0.2/0.6 mbar. |
| 0905 | Recovery meter = 343772 cuft (at 9:04:46). Rate = 0.25 cuft/hour |
| 1333 | Recovery meter = 343773 cuft (at 13:32:50). Rate = 0.20 cuft/hour |
| 1435 | MC(Cernox)/Sorb = 122.9/225.7 K. G1/P1(fridge) = 0.2/0.65 mbar. |
| 1736 | Recovery meter = 343773.5 cuft (at 17:36:27). Rate = 0.10 cuft/hour |
| 1800 | MC(Cernox)/Sorb = 136.5/249.9 K. G1/P1(fridge) = 0.2/0.70 mbar. |
| 2204 | Recovery meter = 343773.8 cuft (at 22:03:56). Rate = 0.051 cuft/hour |
| 2230 | MC(Cernox) = 152.8 K. G1/P1(fridge) = 0.3/0.70 mbar. |