UMN CDMS Wiki archive
start › cdms › k100 › run_diary › 20151228

2015/12/28 (Monday)

Previous Day (Run 55)

1030 Cf source still inside fridge shield for activation. Having some issue opening the safe, so leave the source inside shield for now. Fill LN2 cold trap full.
1045 Got the safe open; I think the latch needed to be jiggled to prevent the safe from thinking it was engaged. Place Cf source back inside safe.
1145 Pump and flush main bath in preparation for LN2 transfer.
1155 Evacuate 1K Pot.
1230 Add 6.3mbar of He exchange gas to IVC.
1240 Commence LN2 transfer.
1355 Prepare for cryocleaning mixture. Turn on He3 pump. Open manual dump valves. Open V9. It reads 779mbar. Using today's barometric pressure of 30.14inHg, the true pressure in the dump is ~786mbar. Still appears that there's less than the 800mbar of mixture we expect. Cryocleaning might pick some up in the lines in the IGH. Close V9, Open V4, V12A, and the Cold Trap 1 speedivalve to let mixture backflow into Cold Trap 1.
1400 Open V14, V13A, and V6 to 12.8% to begin cryocleaning through Cold Trap 1.
1440 Mixing Chamber temperature at 124K. Sorb temperature at 175K.
1510 Mixing Chamber temperature at 107K. Sorb temperature at 138K.
1530 Mixing Chamber temperature at 99K. Sorb temperature at 128K.
1540 Cease LN2 transfer. Attach ping pong ball to exhaust port.
Cease cryocleaning. Pump mixture back to dump.
1550 G1: 0.5mbar, G2: 790.5mbar, P1: 14ubar. Close V12A and Cold Trap 1 speedivalve to isolate Cold Trap 1. Open V1 to pump out He Cold Trap. G2 increases slightly.
1610 G1: 0.5mbar, G2: 792mbar, P1: 7ubar. Close V5 and V6 and V9 to isolate mixture in dump. Turn off He3 pump.
1715 Mixing Chamber temperature at 81K, Sorb temperature at 123K. External pressure sensor reads 1.6mbar. Turn on scroll pump and commence pumping out IVC exchange gas with it.
1716 Fill LN2 cold trap full. External pressure sensor reads 3.0E-2mbar. Switch to turbopumping on IVC overnight.

Next Day