2016/12/18 (Sunday)
| Status: fridge is warming, probably now at room temperature. Helium has been added to the IVC and the main bath vacuum jacket. 1K Pot needle valve is open. Mixture has been pumped out of LN2 trap, traps are at room temperature. Mixture is open to fridge and dump. | |
| 1205 | Adjust excitation on LakeShore bridge up from 63 to 200 μV, and adjust resistance range. Now temperature reading more stable. |
| 1210 | MC = 20 mW, Sorb/MC(Cernox) = max(249.9K)/290 K, G1/G2 = 685/610 mbar. IVC > 1bar on cold cathode gauge but actually nearly zero on the mechanical gauge - this is a little confusing. |
| 1215 | Turn off MC heater. |
| 1220 | Currently mixture is open to dump through condenser speedivalve, still gate valve, v1, v3, v4, and pump is open to dump through v9. Close v4, turn on 3He pump, then open v6 to 13%. Now pumping mixture to dump. |
| 1230 | Check pressure in Main Bath vacuum jacket : about 1.2 mbar. Begin pumping out vacuum jacket with scroll pump. |
| 1240 | Still pressure below 40 mbar, open V6 further to pump mix to dump more quickly |
| 1240 | Main Bath vacuum jacket down to 0.12 mbar, open valve to turbo pump slightly to pull pressure down further |
| 1250 | Switch Main Bath vacuum jacket pumping over to turbo pump. Pumping pressure = 4 μbar. |
| 1310 | Turbo pressure 1.6 μbar, Main Bath vacuum jacket = 86 μbar (with pump valved out) |
| 1310 | G2 (dump) seems flat at 775.3 mbar. G1/P1 flat at 1.2/0.036 mbar. Stop pumping to dump. Close still gate valve, condenser valve, v1, v3, and v6. Close v9 then turn off 3He pump G2 (Dump) = 775.3 mbar, Pbarometric = 30.57 inHg, Dump pressure (adjusted) = 797.3 mbar |