2021/09/18 (Saturday)

Status	Run 74 in progress. First cooldown after 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. Lead shield erected, 4 walls. Currently both DCRCs are on.
	Position of Am source: y = 0.0 mm
1047	Tower/MC/Coldplate = 94/41.5/193 mK, Still = 1.39 K / 0.1000 mbar / 0 mW, G1/G2= 340.6/304.4 mbar, 1K Pot = 1.56 K / 10±1 mbar. MB = 69.6%.
1059	Fill LN2 cold trap bath
1018	At 10kHz noise in DCRC3qI/qO/DCRC1qI/qO = 10/3.0/2.7/60 8e-6. This is q3/q1/q4/q2 At 3kHz (peak) noise in DCRC3qI/qO/DCRC1qI/qO = 67/14/7.5/250 e-6.
	Noise is slightly higher than yesterday especially @3kHz, while some are slightly lower @10khz.
1123	Start 45 min series of +10/0V data (bias applied after 60 sec), at elevated temperature, with 1000 beginning randoms, trigger threshold 80/55/35/200 on DCRC3qI/qO/DCRC1qI/qO, 5Hz in-run randoms, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). Use Sequencer script r74_takeandflash_dcrcbias.msl. This flashes for 30 seconds at end of series.

07210918_1123.