2015/01/23
| 1210 | Fill LN2 cold trap full |
|---|---|
| 1500 | G1=1.3 mbar, P1=22 ubar, and G2=5.2 mbar. Let in gas to G1 and P1. G1 rises to 807 mbar and P1 rises to 1000 mbar. Close V3 and pump out G1 until it reads 0 mbar. Close V2, V7, and open V1. Measure throughput rate to be 8 mbar/min. |
| 1745 | Isolate fridge lines and close all valves on IGH, ie. stop evacuating circulation lines with turbo pump. |
| Fill N2 cold trap full. | |
| 1830 | Filled circulation lines with helium gas from nitrogen cold trap 1 through condenser line and fridge until gate valve. Opened gate valve and monitored pressure rise in P1. Initial rapid rise to 1.2 mbar, slowing down then speeding up again: |
| Time [min] | P1 Pressure [mbar] | Rate [mbar/min] |
|---|---|---|
| 0 | 1.2 ± 0.1 | |
| 1 | 3.0 ± 0.1 | 1.8 ± 0.1 |
| 2 | 4.5 ± 0.25 | 1.5 ± 0.3 |
| 3 | 5.5 ± 0.25 | 1.0 ± 0.4 |
| 4 | 7.0 ± 0.25 | 1.5 ± 0.4 |
| 5 | 10 ± 0.5 | 3.0 ± 0.6 |
| 6 | 15 ± 0.5 | 5.0 ± 0.7 |
| 7 | 20 ± 1 | 5.0 ± 1.1 |
| 8 | 28 ± 1 | 8.0 ± 1.4 |
| 9 | 36 ± 1 | 8.0 ± 1.4 |
| 10 | 40 ± 2.5 | 14 ± 3 |
| 11 | 60 ± 2.5 | 20 ± 4 |
| 12 | 120 ± 5 | 60 ± 6 |
| 13 | 300 ± 10 | 180 ± 11 |
| 1835 | Evacuate circulation lines with scroll pump. |
|---|---|
| 1910 | Let in gas to G1 and P1. G1 rises to 999.9 mbar and P1 rises to 1000 mbar. Close V3 and pump out G1 until it reads 0 mbar. Open V11A to pump down cold trap until G1<5 mbar. Close V11A and open V1, allowing He gas to flow from still to G1 and then be pumped out with scroll pump. Leave overnight. |
| 1920 | Pack up G106a, filling puck with 7.1 psi nitrogen gas. Include package of rubber bands in crate, with 7 rubber bands securing each eyehooks on bottom and 8 rubber bands securing the eyehooks on top. |