2015/12/09 (Wednesday)

Previous Day

	Setup: iZIP mode, DIB1/2/3 → cables → 3.2 MHz filters → DCRC55/33/50
	Taking background data overnight. Looking at the overnight temperature, there are flashes seen at the ends of runs, but there seem to be some missing:
	Flash times (data starting at 20:30): none, none, 23:20, 00:19, 01:19, 02:18, none, 04:21, 05:21, none, none, 08:21
	The files show that data was taken regularly, one series per hour, last one starting at 07:50. But apparently flashes did not happen every time.

Series	Flash after?	Number of files
07151208_1644	yes	9
07151208_1744	?	10
07151208_1843	?	3
07151208_1949	?	3
07151208_2049	no	6
07151208_2148	no	6
07151208_2248	yes	11
07151208_2348	yes	12
07151209_0048	yes	11
07151209_0147	yes	10
07151209_0250	no	3
07151209_0350	yes	11
07151209_0451	yes	11
07151209_0550	no	7
07151209_0651	no	2
07151209_0750	yes	11

The problems with event rate sometimes falling low that were noted yesterday must still have been showing up because some of the series have very few files. There's a correlation above between low file count and no flash, so probably the flashes were being missed when the computer got bogged down.

0845	Tower/MC(H35)/MC sensor/Cold Plate = 35.2/29.8/44.1/163 mK, Still = 1. K / 0.085 mbar, G1/G2 = 120/125 mbar, 1K Pot = 1.49 K / 1.7 mbar, Main bath = 64.7%
	Above readings taken 23 minutes after last flash, still cooling a little bit.
0850	Fill LN2 cold trap Dewar
0925	It seems that the 1KPot can run remarkably low without adverse affect on base temperature. Nevertheless will try tweaking the needle valve open further.
0930	Checked all phonon channels, all show pulses, none railed
0938	Modify the # of Points control on H35 on LakeShore370 VI to show 24 hours (14400 points) instead of 12 hours (7200 points). Keeping an eye on the VI just in case it starts acting slow.
1105	1KPot has settled to 1.65 K / 7.0 mbar, still falling. Tower temperature is about 0.2 mK lower. This is probably because still is a little warmer: Still = 0.11 mbar, G1/G2 = 150/155 mbar.
1450	Start 2 cycles of background data at -/+4V with 1000 initial randoms, 2000 events/file; 30s flash and 25min cooldown in between series. Use Tuesday's phonon trigger threshold values.
1625	Using MIDAS pulse viewer in Listen Only mode, it looks like the pulses are still showing up fine after the first series of data.
1632	Fill LN2 cold trap full.
1652	After seeing some multiple triggers in the data, adjust the Q-Signal and P-Signal sample lengths to 5 samples (used to be 2 samples) for all 3 DIBs. Q&P Baseline sample lengths are still set to 16 samples.
1659	Set phonon threshold values to low settings from the first attempt at data taking yesterday:

	A	B	C	D
DIB 1	32	30	40	38
DIB 2	18	18	22	22
DIB 3	56	42	40	60

1702	Start 12 cycles of background data at -/+4V, FG=5/2/5, OG=3, 1000 initial randoms, 60 seconds/file; 30s flash and 25min cooldown in between series.

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