UMN CDMS Wiki archive
start › cdms › k100 › run_diary › 20150401

2015/04/01

0857 MC at 77.8 K and flat. Turbo pump gauge on IVC reads 1e-8 mbar. After closing valve to pump, gauge reads 1.6 e-8 mbar
0915 Dump pressure 807.9 mbar at G2
0925 Calibrated leak checker
0930 Leak checking IVC (turbo pump isolated). Background rate is 5.8e-9 mbar*l/s
0935 Background rate has settled down to 4.9e-9 mbar*l/s
1115 Complete LN2 blowout. Leak rate unchanged from 4.9e-9 mbar*l/s.
1140 Pump and flush the main bath. With pumping out the main bath, the leak rate rose slowly to ~2E-8 mbarL/s and then slowly dropped back down as the pumping was completed. While the main bath was flush with He gas, the leak rate did not change from 4.9E-9 mbarL/s. Fill LN2 cold traps full.
1200 Commence cryocleaning mixture through LN2 cold trap 2. Cease pumping on IVC. Add 4.6E-2 mbar of He exchange gas to IVC. Isolate IVC.
1325 Throughput test performed at 77 K gives a flow rate of 48 mbar/min.
1330 Start LHe transfer (0.0%).
1630 Finish LHe transfer (91.6%).
1730 Mixing chamber temperature <10 K. Commence pumping exchange gas out of IVC overnight.
2230 Fill N2 cold trap full.
2235 Interrupt cryocleaning and pump mixture into dump.
2300 Pressure in dump 818 mbar. Cease recovering mixture. Isolate dump.