| Status | Run 74 in progress. Warming up after 3rd appearance of IVC leak at 4K. Cryostat Vacuum Jacket pumping overnight. |
| 1055 | Turbo on CVJ = 12 nbar. With Turbo valved out for 1 minute, CVJ = 160 nbar |
| 1100 | MC(Cernox) = 279 K |
| 1100 | IVC = 0.76 bar. (Lower than yesterday??) |
| 1100 | Start gently pumping IVC with Scroll Pump (because we want to try leak checking IVC again) |
| 1110 | Remove covers from MB pit |
| 1110 | Scroll on IVC < 0.1 mbar, switch to pumping IVC with Turbo |
| 1125 | Lower MB and replace covers on pit. Remove fill funnel from IVC. |
| 1130 | Leak Detector on IVC = 40 pbarL/s. Squirt helium around the seal at the bottom of the stripline tube: leak signal increases to 65 pbarL/s. But a bit of delay - could this leak be higher up? |
| | Squirting higher up on the stripline tube, leak signal increases even more, to 85 pbarL/s. |
| | Squirting around the stipline elbow, leak > 200 pbarL/s |
| 1135 | Start slowly filling IVC with N2 gas |
| 1155 | Remove all but 2 bolts from bottom IVC |
| 1205 | Erect clean tent beneath fridge, start the HEPA filter fan. Wipe inside of tent with methanol. |
| 1215 | Remove IVC bottom |
| 1220 | Remove tape holding up unused stripline. Disconnect 4K heat sinks from tower |
| 1225 | Remove accessory plugs from NW face and SQUET from W face, remove SQUET from SL 43 |
| 1230 | Remove SQUET ZC-13 from E face and from SL 41 |
| 1230 | Remove tower socket covers from unused tower faces |
| 1240 | Remove 4K shield |
| 1245 | Disconnect 600mK rod from tower. Remove all three 100mK heat sinks |
| 1255 | Remove 100mK shield inner and outer pieces |
| 1300 | Remove tape holding Tower thermometer to 30mK can, unplug tower thermometer |
| 1300 | Matt exits lab |
| 1544 | Derek enters lab. |
| 1600 | Remove cap from bottom of tower |
| 1600 | Remove some of the bolts attaching the tower adapter ring to the 30mK can |
| 1615 | Attach tower stand ring to bottom of IVC |
| 1625 | Raise tower stand to support tower and tighten the nuts on the threaded rods to hold the stand up |
| 1625 | Remove remaining bolts from tower adapter ring, detaching tower from 30mK can |
| 1630 | Put read drill case under IVC and put scissor jack on top of case |
| 1635 | Raise scissor jack to support tower stand. Then loosen the nuts on the threaded rods a lot. |
| 1635 | Lower the tower with the scissor jack, being careful to guide the 600 mK rod, make sure the tower elements clear the can, and keep the striplines and thermometer wire from snagging on things |
| 1640 | When tower is low enough that threaded rod nuts are near the top of the threaded rods, tighten the nuts to support the tower with the stand, then remove the drill case from under the scissor jack. Then position the scissor jack under the tower stand and raise it again to support the tower. |
| 1645 | Remove threaded rods from fridge stand, then continue lowering the tower with the scissor jack |
| 1645 | Detach tower stand ring from IVC and lower it down on the fridge stand shafts |
| 1650 | Pull tower stand and jack free of IVC, pulling the shafts slightly apart to clear the IVC |
| 1655 | Double-bag tower and place it in clean room anteroom |
| 1710 | Remove clean tent and store in pump alley |
| 1710 | Derek exits lab |