2015/10/23 (Friday)

Previous Day

	Current setup: iZIP mode, DIB1/2/3 → cables → 3.2 MHz filters → DCRC55/33/50.
	Overnight: Taking background data. DAQ stopped due to file copy error. Last flash at 00:20
0835	Tower/MC(H35)/MC sensor/Cold Plate = 30.9/25.2/41.4/159 mK, Still = 1.35 K / 0.11 mbar, G1/G2 = 115/110 mbar, 1K Pot = 1.66 K / 11 mbar, Main bath = 26.6%
	1K Pot pressure looks ok at the moment.
0842	Start LHe transfer at 26.6%
0850	Fill LN cold trap Dewar
0933	End LHe transfer at 93.5%
1000	Cf source exchange: Yesterday we loaned our Cf-252 source to Soudan, and they loaned us their (weaker) Cf-252 source in exchange, delivered this morning:

	Measured	Date measured	Current activity
UMN K100 Cf source	10 μCi	2010 June 1	90.0 kBq
Soudan Cf source	5 μCi	2003 August 15	7.58 kBq
UMN K100 / Soudan	2		12

The Soudan source is weaker, but we can of course place it closer to the detector: we have been running our source near the top of the shield, about 26“ from the detector. We can place the Soudan source at detector level, about 9” from the detector. Assuming rate goes as 1/r^2 the Soudan source would then give us a rate around 30% less than we achieve with our source.

1030	After restarting the computer and mapping the Chokula drive to Y:, then disconnecting, and remapping to Z:, we're finally able to connect Chokula on Vuk-01. Because of the error, the detector's been biased at -/+4V for the entire night, so Flash 30s before taking data.
1045	Modify MultiDAQ to not throw an error if it can't copy the files to Chokula during the run. This should ensure that DAQ keeps running if Chokula gets disconnected for some reason. Though this would mean that the Metadata text file doesn't get written anywhere…
1058	Start 30min run of background data at -/+8V overshooting +Qbias (side 2) to 14V before starting data, FG=5/2/5, OG=3, with 1000 initial randoms, 2000 events/file, 30s flash and 25min cooldown after. Use Wednesday's phonon thresholds.
1158	Start 30min run of background data at +/-8V overshooting +Qbias (side 1) to 14V before starting data, FG=5/2/5, OG=3, with 1000 initial randoms, 2000 events/file, 30s flash and 25min cooldown after. Use Wednesday's phonon thresholds.
1303	Start 30min run of background data at -/+6V overshooting +Qbias (side 2) to 14V before starting data, FG=5/2/5, OG=3, with 1000 initial randoms, 2000 events/file, 30s flash and 25min cooldown after. Use Wednesday's phonon thresholds.
1409	Start 30min run of background data at +/-6V overshooting +Qbias (side 1) to 14V before starting data, FG=5/2/5, OG=3, with 1000 initial randoms, 2000 events/file, 30s flash and 25min cooldown after. Use Wednesday's phonon thresholds.
1522	Start 30min run of background data at -/+10V overshooting +Qbias (side 2) to 14V before starting data, FG=5/2/5, OG=3, with 1000 initial randoms, 2000 events/file, 30s flash and 25min cooldown after. Use Wednesday's phonon thresholds.
1625	Start 30min run of background data at +/-10V overshooting +Qbias (side 1) to 14V before starting data, FG=5/2/5, OG=3, with 1000 initial randoms, 2000 events/file, 30s flash and 25min cooldown after. Use Wednesday's phonon thresholds.
1730	Reestablish connection to chocula, at least for now.
1736	Fill LN2 cold trap.
1747	Start 30min series of background data at +/-4V, FG=5/2/5, OG=3, with 1000 initial randoms, 2000 events/file, 30s flash and 25min cooldown after. Use Wednesday's phonon thresholds. Didn't think it was writing to chocula so aborted.
1750	A few false starts: one of the DCRC ports was not free after turning off the DAQ, so MultiDAQ kept crashing. After entering “sock” on the Putty session it should be the case that 1 and 2 are not connected: if one of them is connected enter “quit 1” or “quit 2”.
1757	Start 40 cycles of 30min series of background data at +/-4V, FG=5/2/5, OG=3, with 1000 initial randoms, 2000 events/file, 30s flash and 25min cooldown after. Use Wednesday's phonon thresholds.

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