UMN CDMS Wiki archive
start › cdms › k100 › run_diary › 20130621

2013/06/21

1040 Pressure in dewar: 8.6E-5 mbar. Stopped evacuating dewar.
Reconnected the pumping manifold to the turbo pump, scroll pump, and leak checker. Pumped out the manifold with the scroll pump.
Turned opened the turbo pump to the manifold, closed and turned off the scroll pump, and opened the valves to the IVC.
1200 Vacuumed out the inside of the dewar and tightened the indium seals.
1250 Began spray test on indium seals. Original background at 6.21E-9 mbar*l/s. Background fluctuated and increased during test, reaching a maximum value of 7.04E-9 mbar*l/s on the bottom flange. This is most likely due to the increasing He background and not because of a leak. There were no leak rate spikes and the increase was consistent and gradual. No leaks found.
1600 Pressure in IVC: 1.2E-4 mbar.
1636 Ran a leak check of the indium seals. Background leak rate was 4.3E-9 mbar l/s. Overpressurized the main bath with helium. Leak rate did not change.
1737 Filled IVC with 4.6 mbar of nitrogen exchange gas.
1800 Began liquid nitrogen transfer.
2000 Nitrogen liquid level meter reads 1.33 kΩ. Nitrogen transfer complete. Attach ping-pong ball.