UMN CDMS Wiki archive
start › cdms › k100 › run_diary › 20121129

2012/11/29

1010 Fed Cricket 3 pellets.
1110 Removed He and N2 coldtraps.
1336 Re-tightened IVC flange.
1340 Begin heating cold traps. Heating cold traps without He-4 pump on, then evacuating the line.
1350 Begin leak check tests. Calibration is fine.
Background rate: 1.9E-9 mbar l/s.
1415 After checking all flanges, including the bottom flange twice, leak rate is 2.3E-9 mbar l/s. No gross leak detected!!.
1640 Finished cleaning cold traps.
1655 Quick electrical check. Similar results as before.
1943 Returned cold traps to their proper spots. Raised dewar. Filled LN2 cold trap. Begin mixture cleaning.
1959 Open leak checker to IVC (background rate is 1.7E-9 mbar l/s) and isolate turbo pump. Evacuate main bath.
2012 Flushed main bath with He gas. Leak rate is 2.4E-9 mbar l/s. No gross leak found.
2015 Evacuated 1 K pot.
2027 Entered 4.6 mbar of exchange gas into IVC.
2049 Begin LN2 transfer.
0010 End LN2 transfer. Put on ping pong ball.
Mixture cleaning isn't going so well. Cold trap iced up and had to go below 12.8% for the flow to finally stop (even at 12.8%, closing V13b showed a high flow rate). Trying to start over again, but currently at 13.4% and no sign of flow at all.