2021/09/07 (Tuesday)

Lab in-personnel: Giulia and Matt

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
0814	Tower/MC/Coldplate = 95.0/33.7/195.2 mK, Still = 1.33 K / 0.070 mbar / 0 mW, G1/G2= 281.9/267.5 mbar, 1K Pot = 1.56 K / 10±1 mbar. MB = 39.1%.
0821	Fill LN2 cold trap bath
0825	At 10kHz noise in DCRC3qI/qO/DCRC1qI/qO = 8.0/3.0/2.1/37 8e-6. This is q3/q1/q4/q2 At 3kHz (peak) noise in DCRC3qI/qO/DCRC1qI/qO = 140/19/8.0/260 e-6
	Noise is as low as yesterday.
0840	Start 45 min series of +8V/0V (bias applied after 60 sec), with 1000 beginning randoms, trigger threshold 60/55/40/250 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.

07210907_0840

1000	Write new sequence, r74_6bias_takeandflash_dcrcbias.msl. You can put in 6 different biases and times and it will go through them. If you don't want all 6, just put in the same bias for the last ones and 0 time.
1011	Start 45 min series of +10V/0V (bias applied after 60 sec), with 1000 beginning randoms, trigger threshold 60/40/35/250 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.

07210907_1011

1151	Start 45 min series of +10V/0V / +8/0V (initial bias applied after 60 sec, then alternate +10/+8 for 2/2/4/6/8/23 min), with 1000 beginning randoms, trigger threshold 60/40/35/250 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_6bias_takeandflash_dcrcbias.msl. This flashes for 30 seconds at end of series.

1151

Start 45 min series of +10V/0V / +8/0V (initial bias applied after 60 sec, then alternate +10/+8 for 2/2/4/6/8/23 min), with 1000 beginning randoms, trigger threshold 60/40/35/250 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_6bias_takeandflash_dcrcbias.msl. This flashes for 30 seconds at end of series.

07210907_1151

1405	Put Ba-133 source in plastic cup, lower down into shield. Source is at detector level and ~2 inches from the mu-metal shield
1411	Start 45 min series of +8V/0V (bias applied after 60 sec), with Ba-133 source present, with 1000 beginning randoms, trigger threshold 60/40/35/250 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.
	Oops - above series was taken with DCRC3 triggers left off. Only DCRC1 triggers enabled.
1504	Begin LHe transfer @ MB = 29.9%
1510	Put Ba-133 source back in safe
1544	End LHe transfer @ MB = 94.1%

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