| Status: | Circulation and 1K Pot stopped. All mixture in dump. Bath low, boiling away. All GHS valves closed. |
| 0900 | MC (Cernox) = 12.4 K and flat. Coldplate/Still = 32/22 K. 1K Pot > 7 K. Sorb = 18.3 K and completely flat (?). Main bath = 1.3%. |
| 1015 | Turn off MIDAS DAQ programs triggerfe, towerfe, dcrc_driver. Disconnect power from DCRCs. Sorb and MC temperatures go down a little - were the DCRCs warming the tower? |
| 1015 | Main bath = -0.1% (minimum reading) |
| 1110 | Pump lines leading to IVC down to 1.0e-2 mbar. Open IVC to gauge (turbo pump isolated). Gauge falls to 1.9e-4 mbar. Continues to fall. Leave IVC open to gauge. |
| 1115 | MC (Cernox) = 12.26 K, Sorb = 16.2 K |
| 1125 | IVC = 3.0e-5 mbar |
| 1130 | Remove LN traps from their Dewar and allow them to warm up. Open Trap 2 speedivalve and V12B to monitor Trap 2's pressure on G1 (that's the trap we've been circulating through). Before, G1 = 0.2 mbar. |
| 1135 | G1 (Trap 2) = 190 mbar and rising. A lot of contamination. Put Trap 1 back in partially-filled Dewar just in case it has a lot of contamination too. |
| 1140 | IVC = 2.5e-5 mbar |
| 1155 | G1 (Trap 2) = 860 mbar. Still cool to the touch. |
| 1205 | G1 (Trap 2) = 924 mbar. Probably should pump it out. Trap surface close to room temperature, still cool at the bottom. |
| 1215 | Turn on 4He pump. Pump out Trap 2 through V11B, V7, V2A, V5A, manual valve at pump (open in reverse order). |
| 1215 | MC (Cernox) = 11.87 K, Sorb = 15.7 K |
| 1215 | IVC = 1.9e-5 mbar |
| 1230 | Trap 2 pumped down to 0.5 mbar on G1. Surface of trap is room temperature. Close V12B & speedivalve, V11B. |
| 1235 | Open V12A & speedivalve to monitor Trap 1 pressure on G1. Remove Trap 1 from Dewar to let it warm up. |
| 1310 | G1 (Trap 1) = 63 mbar. Still cool to the touch. |
| 1340 | G1 (Trap 1) = 63 mbar. Surface is at room temperature. |
| 1345 | Pump out Trap 1 with 4He pump through V11A, V7, V2A, V5A, manual valve at pump. |
| 1405 | G1 down to 0.6 mbar, stop pumping out Trap 1. Close all GHS valves and 4He pump valve, turn off 4He pump. |
| 1405 | IVC = 1.2e-5 mbar |
| 1405 | MC (Cernox) = 11.13 K, Sorb = 15.6 K |
| 1420 | Add 4.6 mbar He exchange gas to IVC. MC, Sorb, 1K Pot temperatures all fall to around 4K. |
| 1420 | MC (Cernox) = 4.41 K, Sorb = 6.6 K, 1K Pot = 5.5 K |
| 1425 | Checked bath fill port - plenty of pressure still, so there's still LHe in the bath, somewhere below the top of the can. Leave recovery valve open. |
| 1430 | Open V1 to read pressure of LHe cold trap on G1. No significant increase at G1. Close V1 again. |
| 1520 | MC (Cernox) = 4.47 K, Sorb = 7.0 K, 1K Pot = 5.9 K, IVC = 4.6 mbar |
| 1640 | MC (Cernox) = 4.59 K, Sorb = 7.6 K, 1K Pot = 6.4 K, IVC = 5.4 mbar |