2014/08/22
| 1058 | Fill LN2 coldtrap full. |
|---|---|
| 1110 | Fed Geronimo and Brutus. |
| 1235 | Attach Scroll pump to IVC pumping apparatus. Turn on leak checker. |
| 1500 | After lowering the dewar several inches to allow warming, mixing chamber temperature is at 15 K. Background leak rate is 1.6e-8 mbar*L/s. When the IVC was opened to the leak checker, the leak rate quickly jumped to 4.3e-2 mbar*L/s indicating that there was a significant amount of He in the IVC. Isolate leak checker with IVC pressure of 2.5e-2 mbar to act as exchange gas. Lower the dewar the rest of the way. |