2019/09/18 (Wednesday)
| Status: warm, IVC open, preparing for Run 71. Tower assembled. Have cryocleaned mixture 7 times so far. | |
| 0950 | Check warm LN2 Cold Trap 1: 6.9 mbar. Pump out trap. |
| 1000 | Check warm LN2 Cold Trap 2: 2.2 mbar. Pump out trap. |
| 1005 | Fill LN2 cold trap bath |
| 1010 | Start cryocleaning mixture through LN2 Cold Trap 1, V6 = 12.8% |
| 1025 | Increase V6 → 13.2% to restart flow |
| 1045 | Increase V6 → 13.3% to speed up flow |
| 1110 | Stop cleaning through Trap 1 after 60 min. G2 flow pressure was 565-680 mbar. Pump mixture to dump. Removed 6.7 mbar. |
| 1135 | Start cryocleaning mixture through LN2 Cold Trap 2, V6 = 13.4% |
| 1140 | Increase V6 → 13.5% to restart flow |
| 1150 | Increase V6 → 13.6% to speed up flow |
| 1235 | Stop cleaning through Trap 2 after 60 min. G2 flow pressure was 570-670 mbar. Pump mixture to dump. Removed 2.1 mbar. |
| 1255 | Check warm LN2 Cold Trap 1: 6.7 mbar. Pump out trap. |
| 1310 | Start cryocleaning mixture through LN2 Cold Trap 1, V6 = 13.4% |
| 1330 | Increase V6 → 13.5% to speed up flow |
| 1410 | Stop cleaning through Trap 1 after 60 min. G2 flow pressure was 575-650 mbar. Pump mixture to dump. Removed 4.7 mbar. |
| 1450 | Check warm LN2 Cold Trap 2: 2.1 mbar. Pump out trap. (note - trap may have been a little cold) |
| 1505 | Start cryocleaning mixture through LN2 Cold Trap 2, V6 = 13.2% |
| 1510 | Increase V6 → 13.3% to restart flow |
| 1525 | Increase V6 → 13.4% to restart flow |
| 1540 | Increase V6 → 13.5% to speed up flow |
| 1625 | Stop cleaning through Trap 2 after 80 min (longer than intended). G2 flow pressure was 565-705 mbar. Pump mixture to dump. Removed 3.4 mbar. |
| 1710 | Check warm LN2 Cold Trap 1: 4.7 mbar. Pump out trap. |
| Tower installation | |
|---|---|
| 1400 | Move tower into clean tent at fridge and begin installation |
| 1500 | Install tower, begin to attach 100 mK shields. |
Connections to the motorized source wiring at the Tower base level:   |
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| 1700 | During electrical check of DIB3 find that SQUID B is open and QETB is not connected (QETB return lines are OK). Suspect the SQUET, ZC-74. Pin 27 on the stripline side has been trouble, we tried resoldering it. Pin 26 is QETB, right next to it. This one was unstable when we unplugged the SQUET from the tower and messed with it. We'll remove the SQUET and try to repair it. |