2020/03/22 (Sunday)
| 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. Recovery valves closed. Plan is to try to fix leak at top of stripline tube. Lab is in hibernation because of novel coronavirus. |
| 1140 | MC(Cernox) = 294.8 K. |
“we are asking units across the University to make available supplies that may contribute to patient care and our complete clinical/health care response to COVID-19.”
Inventory of PPE materials to donate:
- Nitrile gloves, medium. 4 bags of 100
- Nitrile gloves, large. 3 bags of 100
- Non-skid shoe covers. 1 bag of 50
- Head covers. 2 bags of 100
- Tyvek coveralls, XL. 7 coveralls
| 1500 | Fill IVC to 1 bar of N2 |
|---|---|
| 1530 | Pump out cryostat vacuum jacket. Neglected to pump out the large hose before opening vacuum jacket valve, so some air got in. |
| 1535 | Turbo on cryostat vacuum jacket = 0.74 ubar. With turbo valved out, cryostat vacuum jacket = 54 ubar. |
| 1615 | With turbo valved out, cryostat vacuum jacket = 34 ubar. Stop pumping out cryostat vacuum jacket. May want to pump it out more later. |