2021/06/04 (Friday)
- Lab in-personnel: Matt, Scott
| Status | Run 74 in progress. Warmed up after 3rd appearance of IVC leak at 4K. Cryostat Vacuum Jacket pumped out. Mixture cryocleaned once. |
|---|---|
| Tower installation in progress. | |
| 1100 | Check contents of warm LN2 Trap 1: 9.8 mbar. Pump out with Scroll Pump |
| 1125 | Start cryocleaning mixture through LN2 Cold Trap 2, V6 = 12.5% |
| 1135 | Increase V6 → 12.7% to restart flow |
| 1205 | Increase V6 → 12.9% to speed up flow |
| 1210 | Increase V6 → 13.0% to speed up flow |
| 1220 | G2 increased as usual after increasing V6, seemed to peak, but then started slowly going up again - strange. Reached 900mbar so I stopped the cleaning early. |
| 1220 | Stop cleaning through Trap 2 after 55 min. G2 flow pressure was 575-900 mbar. Pump mixture to dump. Removed 2.9 mbar. |
| 1130 | Tape thermometer wire up around base of 30mK can |
| 1315 | Start cryocleaning mixture through LN2 Cold Trap 1, V6 = 13.0% |
| 1330 | Increase V6 → 13.1% to restart flow |
| 1355 | Increase V6 → 13.2% to speed up flow |
| that's too high! close V6 again, we'll start over | |
| 1400 | Open V6 → 13.0% to restart flow |
| 1410 | Increase V6 → 13.1% to speed up flow |
| 1440 | Stop cleaning through Trap 1 after 85 min. G2 flow pressure was 595-645 mbar. Pump mixture to dump. Removed #.# mbar. |
| 1325 | Start installing 100mK stage |
| 1530 | Finish installing 100mK stage |
| 1540 | Check contents of warm LN2 Trap 2: 2.9 mbar. Pump out with Scroll pump |
| 1605 | Finish attaching 4K stage and attaching covers over unused tower faces 1,3,6 |
| 1615 | Attach to DIB1/Face2/East SQUET ZC-13 and Stripline 41/Cable 2. Quick check at breakout box: looks OK, continuity between qI and qO, no shorts to chassis. |
| 1625 | Attach to DIB2/Face5/West SQUET ZC-39 and Stripline 43/Cable 3. Don't connect accessory plugs yet, then quick check of DIB1 at breakout box: looks OK. |
| 1630 | Attach to Face4/NorthWest accessory plugs (Stripline 43/Cable 3). (See photos from Jan 21.) Then quick check of DIB1 at breakout box: looks OK, motor coil resistances good, continuity between qI/qO bias and QETA Return 1 (side2 electrode). |
| 1650 | Finish screwing in FET cards and SQUID cards. Finish attaching 4K heatsinks. |
| 1655 | Coil extra stripline into a loop and tape it up to the other two with kapton tape |
| 1705 | Put indium o-ring on bottom IVC section |
| 1710 | Attach bottom IVC loosely with a few bolts |
| 1715 | Check contents of warm LN2 Trap 1: 4.8 mbar. Pump out with Scroll pump |
| 1730 | After tightening IVC bolts a few rounds, start gently pumping IVC with Scroll pump |
| 1750 | Tighten IVC bolts more, also tighten the other 3 IVC seal bolts. IVC = 0.16 mbar and falling. |
| 1800 | IVC = 0.12 mbar, close enough - start valving in the Turbo pump. |
| 1805 | Start pumping IVC with Turbo pump |