| 940 | Mixing chamber temperature: 233K. Lower the dewar slightly farther in hopes of speeding up warm up. |
| 1100 | Mixing chamber temperature: 249K. Turn on He3 pump and open V9. G2: 786mbar. Open Gate and Condenser Line Speedivalve. Perform throughput test. Throughput rate of 12.5mbar/min. We're fine. Either the blockage is in a part of the fridge warmer than what the MC thermometer reads, or it was oil that's become less viscous. (awesome! -matt) |
| 1115 | Pump mixture to dump. |
| 1125 | Close Gate and Condenser Line Speedivalve. Put cold trap 1 into the bath and fill LN2 cold trap bath. Commence cryocleaning. |
| 1140 | Raise dewar. |
| 1215 | Turn off mixing chamber heater. Still heater still on. Mixing chamber temperature: 253K. |
| 1255 | Even with scroll pump sitting in for He4 pump, Main Bath is taking an awfully long time to pump down. It's finally low enough to flush with He gas. |
| 1324 | Commence pumping mixture to dump. |
| 1400 | Close cold trap 2 speedivalve and valve 12B (keep V9 open). G1=1.5 mbar, G2=798.6 mbar, P1=9 ubar. Open Gate and condenser line speedivalve, and P1 rises to 0.17 mbar. Open V1 and V3; G1=1.5 mbar, P1=.22 mbar, G2=799 mbar. Open the coldtrap 1 speedivalve and aim to pull 100 mbar from the dump to circulate through coldtrap 1 and the fridgelines, to hopefully help purge any remaining contaminate. Open V13A and close once G2=700 mbar. Open V6 to 13% and start cryocleaning through fridge lines. Adjust V12A and V6 % levels as need to keep G1 and G2 from rising too steeply, while maintaining flow. |
| 1500 | After cryocleaning through the fridge lines with 100 mbar (G2 pressure) worth of mix, pump mixture back to dump. |
| 1515 | Mixing chamber temperature: 256 K. Close all IGH valves; G1=0.6 mbar, P1= .05 mbar, G2=797 mbar. Conduct throughput test, with G1 climbing to 714 mbar before stabilizing, and dropping to 55 mbar once V1 was opened. Throughput test again showed a rate of 12.5 mbar/min. Commence pumping mixture to dump. |
| 1524 | Turn off still heater. |
| 1530 | G1= .7 mbar, P1= 7 ubar, G2= 797 mbar. Close Gate and condenser line speedivalve. |
| 1540 | Close V6, and V1. Open V12A, V12B and both cold trap speedivalves to get remaining cold trap mixture to the dump. |
| 1542 | Bath is flush from before, and 3 mbar He exchange gas added on 2016/04/19 has warmed to become 4.0 mbar He exchange gas in IVC. Pump out 1K Pot and commence LN2 transfer. Mixing chamber temperature at 256 K. |
| 1614 | With G1 ~1 mbar and G2=797.5 mbar, close cold trap speedivalves and V12A, and V12B. Close V5 and V9. Use rough pump to pump out lines leading to V7, and the isolate pump from lines, with P2=.13 mbar and V2A and V5A are open. Remove cold trap 1 from LN2 bath and open V7 and V11A. |
| 1640 | P2=1.1 mbar and coldtrap 1 is no longer frosty. Pull cold trap 2 from LN2 bath and open V11B so that both traps are open to P2. Mixing chamber temperature currently at 220 K. |
| 1705 | Mixing chamber temperature at 184 K. P2 reads 4.0 mbar; open valve to rough pump to pump out both LN2 cold traps. |
| 1745 | Isolate LN2 cold traps from rough pump and insert back into LN2 bath. Turn off rough pump. |
| 1820 | End LN2 transfer, mixing chamber temperature at 111 K. Attach ping pong ball. |
| 1830 | With all valves in IGH closed, turn off He 3 pump. |
| 1925 | Mixing chamber temperature at 90 K. Detach rough pump from Main Bath/He Recovery Line and attach to IVC line in preparation for pumping out exchange gas (currently 1.4 mbar). |
| 1940 | Mixing chamber temperature at 88 K and IVC at 1.4 mbar. Commence pumping out IVC exchange gas with rough pump. |
| 1945 | IVC at 3.0E-2 mbar, switch to turbo pump. Isolate and turn off scroll pump. |