2023/03/10 (Friday)
* Lab in-personnel: Zach, Himangshu
| 1400 | Wiki is down for now and MB is ~5%, might be a little too high to add exchange gas to the IVC and CVJ. |
|---|---|
| 1400 | Connect line from turbo to CVJ, pump out line with scroll pump until 0.1 mbar then switch to turbo pump, leave this pumping for now. |
| Pump mixture to dump | |
| 1406 | Turn on 3He pump, open V6 to 13%, close V13A. |
| 1409 | G1 is lower (20 mbar) Open V6 to 20% then 30% then 100% |
| 1414 | MC temp cools a little bit |
| 1425 | P1 = 0.19 mbar. Close V1, condenser speedivalve, and still gate valve so that we are only pumping on the cold trap. |
| 1430 | P1 = 0.036 mbar. Stop pumping on the cold trap and resume pumping on the fridge. Close V12A+speedivalve and open V1, condenser speedivalve, and still gate valve. |
| 1517 | P1 = 0.016 mbar. Stop pumping mixture to dump. Close condenser speedivalve, still gate valve, V1, V3, then V6. |
| 1524 | V6 is fully closed. Close V9, leaving 708.6 mbar in the dump. Turn off 3He pump. |
| 1543 | Add a tube length of He exchange gas to the IVC (turbo and CVJ closed), MC begins cooling as expected |
| 1547 | MC = 4.31 K, IVC = 3 ubar, add another tube length of exchange gas. Now IVC = 22 ubar |
| 1553 | Add another tube length of exchange gas, now IVC = 34 ubar |
| 1558 | Add 3 more tube lengths of exchange gas, now IVC = 0.1 mbar, close IVC valves. |
| 1601 | Pump out line to CVJ |
| 1610 | Add 1 tube length of He exchange gas into the pump manifold (turbo, IVC, and CVJ closed) then let the exchange gas into the CVJ. |
| 1612 | He recovery meter starting to turn |
| Check bag level in He liquifiying room, was at around 90% with 1 pump on so turn on the 2nd pump | |
| 1617 | CVJ = 0.14 mbar, MC temp rising |
| 1644 | CVJ = 0.03 mbar, recovery meter turning slowly. |
| 1645 | Add another tube length of He exchange gas directly into the CVJ, CVJ = 0.25 mbar |