2023/01/19 (Thursday)

Previous Day

• Lab in-personnel: Zach, HImangshu, Carson

Status	Run 77 preparation
Setup	DCRC33(2)→HV control, NaI trigger signal → DCRCX(4)
	IVC closed and Turbo pumping for a while. No tower - this was just for a leak test.
1205	Check contents of warm LN2 Trap 1: 13.2 mbar. Pump it out with the scroll pump.
1215	G1 = 2.2 mbar and stable, stop pumping on Trap 1
1220	Place cold trap 1 in the LN2 bath, begin filling with LN2.
1230	Begin cryocleaning mixture through cold trap 1
1234	Open V6 to 12.1% to restart flow
1247	Open V6 to 12.4% to restart flow
1345	End cryocleaning, pump mixture to dump.
1402	G1 = 1.9 mbar and stable. Close all valves and turn off 3He pump, leaving 729.6 mbar in dump. Pull out cold trap 1.
1417	Check contents of warm LN2 Trap 2: 1.5 mbar. Pump it out with the scroll pump.
1430	Begin cryocleaning mixture through cold trap 2, V6 at 12.5%.
1536	Open V6 to 12.6% to restart flow
1600	Mount sources (stationary Am pellet and movable Am) on the 2d source mover and assemble tower with the two thermometers (new RX-102B-RS and old U02844) on top
1612	End cryocleaning, pump mixture to dump.
1627	G1 = 1.9 mbar and stable. Close all valves and turn off 3He pump, leaving 731.0 mbar in dump. Pull out cold trap 2
1633	Cold trap 1 should be warm enough now, check contents: 13.2 mbar. Pump it out with the scroll pump.
1700	I put cold trap 1 back into the LN2 bath but decided not to do another cryocleaning cycle.

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