2016/09/23 (Friday)

Previous Day

	DCRC1 and DCRC3 powered on and connected through HV setup EBoxDIB 2/3 → 3.2 MHz filters → Cables → remapping board I/remapping board II → HVside2board “DIB1”/“DIB2” → DCRC55(1)/50(3). Remapping boards have all possible lines switched off. .
	Baked using UV LEDs for 8 hours last night. Tower was at 0.40 K until 06:53 then fell to base over about 40 minutes.
0835	Tower/MC/Coldplate = 93/57/??(2.1 kΩ) mK, Still = 1.12 K / 95 μbar, G1/G2 = 175/160 mbar, 1K Pot = 1.56 K / 5.5 mbar. MB = 45.5% As yesterday the thermometers connected to “FRIDGE OUT 1”/“SENSOR 1” cable to the thermometer breakout box seem to be reading wrong. Coldplate is off scale, Still is higher than usual, MC Sensor = 79 mK Boiloff rate: good 1K Pot has been stable.
0825	Fill LN2 cold trap bath.
1009	Start data, but forgot to put out Ba source. Stop data, ground detector, and put out Ba source.
1017	Manually start 15min background data series at HV = 8V, DCRC1/Readout= -8V, with 1000 initial randoms, 1000 ending randoms with 150 ADC Bin trigger threshold on DIB1 Qo.
1032	Cease data tests. Ground detector, flash with UV LEDs for 30s, then cool down for 10 minutes.
1045	Manually start 15min background data series at HV = -8V, DCRC1/Readout= 8V, with 1000 initial randoms, 1000 ending randoms with 150 ADC Bin trigger threshold on DIB1 Qo.
1101	Cease data tests. Ground detector, flash with UV LEDs for 30s, then cool down for 10 minutes.
1115	Manually start 15min background data series at HV = 7V, DCRC1/Readout= -7V, with 1000 initial randoms, 1000 ending randoms with 150 ADC Bin trigger threshold on DIB1 Qo.
1133	Cease data tests. Ground detector, flash with UV LEDs for 30s, then cool down for 10 minutes.
1150	Return Ba source to safe
1200	Do a rate check with no external source: apply 10 V on DCRC1qO on the DCRC, expand pulseviewer window to 50 ms, take some random traces and count how many visible pulses there are. In 400 mS 56 pulses seen, so rate is 140 Hz.
1211	Flash with UV LEDs for 30s, then cool down for 10 minutes.
1230	Move the 1 Ci PuBe source into the lab. It is in its paraffin-filled transport barrel on a stool behind the fridge on the west wall (by the LN2 cold traps). One of the movable shield walls has been moved into the west position between the PuBe source and the fridge. According to Andy Astleford the background is low enough to work at all of our work stations.
1240	Remeasure event rate. Counted 42 pulses in 400 ms, even less than before. I may not been counting as many small pulses as before, so maybe there's a bias: could be about 10 more pulses. So the rate with the PuBe source is no bigger than the rate without the source.
1255	Flash with UV LEDs for 30s, then cool down for 10 minutes.
1309	Manually start 15min background data series at HV = -7V, DCRC1/Readout= 7V, with ~~1000 initial randoms, 1000 ending randoms~~ with 150 ADC Bin trigger threshold on DIB1 Qo.
1325	Cease data tests. Ground detector, flash with UV LEDs for 30s, then cool down for 10 minutes.
1339	Manually start 15min background data series at HV = 6V, DCRC1/Readout= -6V, with ~~1000 initial randoms, 1000 ending randoms~~ with 150 ADC Bin trigger threshold on DIB1 Qo.
1346	Brief base temp excursion from 90mK to 110mK.
1356	Cease data tests. Ground detector, flash with UV LEDs for 30s, then cool down for 10 minutes.
1411	Manually start 15min background data series at HV = -6V, DCRC1/Readout= 6V, with ~~1000 initial randoms, 1000 ending randoms~~ with 150 ADC Bin trigger threshold on DIB1 Qo.
1427	Cease data tests. Ground detector, flash with UV LEDs for 30s, then cool down for 10 minutes.
1445	Manually start 15min background data series at HV = 4V, DCRC1/Readout= -4V, with ~~1000 initial randoms, 1000 ending randoms~~ with 150 ADC Bin trigger threshold on DIB1 Qo.
1505	Crap, trace length was still long since looking at the event rate at 1240. So the last four series have 50 ms traces and also were set to 100000 initial randoms, so it's all randoms.
1526	Commence LHe transfer (34.1%).
1614	End LHe transfer (92.8%).
1625	Release pressure from main bath.
1650	Release pressure from main bath.
1700	Remove resistor from DIB1 QOFB line and commence automated eight series of 30 sec flash with UV LEDs/10 minute cooldown/20 minutes data with 0V HV/ 0V DIB1 and 1000 starting/1000 ending randoms with 150 ADC Bin trigger threshold on DIB1 Qo.
1704	Fill LN2 cold trap full.
1715	Release pressure from main bath.
1900	Na-22 source placed 2-3 feet from center of main bath, on the floor.
2114	Commence 12 hour UV bake.

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