2021/07/19 (Monday)

Status	Run 74 in progress. First cooldown aftr IVC rebuild.
	Tower thermometer is reading high, probably this is a thermometer problem and the actual temperature is much lower. High noise in some of the charge channels.
	Setup: DIB1/2+acc → SL 41/43 → 3.2 MHz filters → cables 2/3 → nothing/Source_mover_board+HV_diverter_board → DCRC50(3)/55(1). Kepco 40V supplye → HV BNC. No lead/poly shield. Currently both DCRCs are on.
1101	Tower/MC/Coldplate = 154/35.8/193 mK, Still = 1.40 K / 0.080 mbar / 0 mW, G1/G2= 300/268 mbar, 1K Pot = 1.62 K / 20±1 mbar. MB = 21.7%.
1110	Fill LN2 cold trap bath.
1422	Begin LHe transfer. MB = 17.1%
1457	Finish LHe transfer. MB = 90.3%
1555	At 10kHz noise in DCRC3qI/qO/DCRC1qI/qO = 38/6.0/4.2/110 e-6. This is q3/q1/q4/q2 At 3kHz (peak) noise in DCRC3qI/qO/DCRC1qI/qO = 6200/400/140/4300 e-6
	This is a lot worse than last Friday, the 3kHz oscillations are bad today. It's also very hot outside so likely more humid in the lab.
1610	Place Na-22 source 40 cm East of detector (center-to-center distance) on stand in lead castle.
1621	Start series then abort - randoms set incorrectly.
1623	Start 45 min series of 0V/-15V (bias applied after 60 sec), with Na-22 source at 0.40 m, with 1000 beginning randoms, trigger threshold 180/70/40/450 on DCRC3qI/qO/DCRC1qI/qO, 5Hz in-run randoms, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). Start sequence with Start button.
1715	Dial bias down to 0V and flash detector for 60 seconds.