2020/03/20 (Friday)
| 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 failed due to helium in IVC. Warming up again. Helium and nitrogen in IVC and cryostat vacuum jacket. 1K Pot isolated. All mixture in dump. LN2 Trap 1 cleaned. MB recovery valve open. Plan is to try to fix leak at top of stripline tube. Lab is in hibernation because of novel coronavirus. |
| 0334 | Recovery meter = 343774.85 cuft, hasn't moved for 23 hours. But at this point it starts moving a little backward. |
| 0334 | MC(Cernox) = 282.7 K. |
| 0734 | Recovery meter = 343774.8 cuft. Rate = -0.0125 cuft/hour |
| 0935 | MC(Cernox) = 285.4 K. |
| 0944 | Recovery meter = 343774.775 cuft. |
| 1100 | Close MB recovery valve (Mike R did this for us). |
| 1144 | Recovery meter = 343774.76 cuft. |
| 0825 | MC(Cernox) = 289.1 K. |