2017/09/19 (Tuesday)

	Status: Tower installed and has passed electrical checks. IVC passed leak check. Pumped out IVC with turbo pump since Friday.

Decision on He-3 pump:

We will try using the pump normally for this run. After the run we will change the oil. This requires pulling mixture out of the pump with the cryopump. We will use 3L of LVO 210 pump oil (this oil was used on 2014 November 20).
The second pump is leaky according to Hassan's exit email from June 2015. We should contact Oerlikon Leybold for maintenance/repair/replacement.

1115	Turbo = 22 nbar, IVC = 0.74 μbar.
1120	Check the cold traps: each has about 1 mbar. Pump them out with scroll pump. Then fill LN2 cold trap bath.
1130	Begin cleaning mixture through Cold Trap 2 with V6 open to 12.6%.
1135	Circulation stopped, increase V6 to 12.8% to restart circulation
	Notice that pump is louder / whinier now than earlier today, with a larger inlet pressure.
1210	Circulation stopped, increase V6 to 13.0% to restart circulation
1300	Stop cryocleaning after 90 minutes, Trap 2
1350	Warm up Trap 2 and pump out: 62.5 mbar of contaminants.
1405	Begin cleaning mixture through Cold Trap 2 with V6 open to 12.3%. Flow stops, increase V6 to 12.8% to start flow again.
1410	Circulation stopped, increase V6 to 13.0% to restart circulation
1540	Stop cryocleaning after 95 minutes, Trap 2
1555	Begin cleaning mixture through Cold Trap 1 with V6 open to 13.1%.
1610	Circulation stopped, increase V6 to 13.2% to restart circulation
1705	Stop cryocleaning after 70 minutes, Trap 1