2020/05/21 (Thursday)
- Lab in-person: Matt
- Virtual partner: Zach
| 0944 | Matt Fritts body temperature = 97.7 F |
|---|---|
| 1040 | Matt enters lab |
| 1050 | Check contents of warm LN2 trap 1 = 11.4 mbar, pump out with scroll pump. |
| 1055 | Check contents of warm LN2 trap 2 = 7.3 mbar, pump out with scroll pump. |
| 1105 | Start cryocleaning mixture through LN2 Cold Trap 1, V6 = 12.4% |
| 1110 | Increase V6 → 12.6% to restart flow |
| 1135 | Increase V6 → 12.9% to restart flow |
| 1215 | Stop cleaning through Trap 1 after 70 min. G2 flow pressure was 550-740 mbar. Pump mixture to dump. Removed 13.3 mbar. |
| 1230 | Start cryocleaning mixture through LN2 Cold Trap 2, V6 = 12.9% |
| 1240 | Increase V6 → 13.0% to speed up flow |
| 1250 | Increase V6 → 13.1% to speed up flow |
| 1320 | Increase V6 → 13.2% to speed up flow |
| 1340 | Stop cleaning through Trap 2 after 70 min. G2 flow pressure was 550-735 mbar. Pump mixture to dump. Removed 3.4 mbar. |
| 1235 | Turbo on IVC = 22 nbar. With turbo valve out for 5 minutes, IVC = 860 nbar |
|---|---|
| 1245 | Leak Detector on IVC, settles to 13 pbarL/s. |
| 1245 | Squirt a lot of helium gas around stripline elbow. LD rises to 50 pbarL/s. DAMMIT! |
| 1415 | Squirt helium through needle for 1 second at various locations: Between knurled knobs at North: →28 pbarL/s Between knurled knobs at other points: no rise different points in the KF joint to the elbow: no rise Above knurled knobs: South/East/North = 63/no_rise/42 pbarL/s. |
| 1420 | Full blast for a few seconds above knurled knob, all around: → 123 pbarL/s. |
| 1422 | Check contents of warm LN2 trap 1 = 13.3 mbar, pump out with scroll pump. |
| 1435 | Matt leaving lab. |
| 2025 | Matt Fritts body temperature = 97.3 F |
| Transfer line hanging system for one-person transfers | |
|---|---|
 | Transfer line hanging on hooks from LHe recovery pipe |
 | Transfer line hanging on hooks from LHe recovery pipe |
 | Transfer line hanging on hooks from LHe recovery pipe |
 | Vertical part of transfer line pulled to the side so that the Dewar can be rolled into place |
| After trying it out, I decided to hang the line on only two hooks, one at each end. The vertical part can then be lifted and inserted into the Dewar. You lift it off of the near hook. But then the far hook has to hold, or the line will fall. So I made a clip so that the line has less chance of slipping out of the far hook. | |
 | Far hook showing clip to lock in transfer line |