2017/07/19 (Wednesday)

Previous Day

	Setup: DIB 1/3/4 → 3.2 MHz filters 1/2/3 → cable 1/2/3 → gender changer 1/3/4 → DCRC55(1)/33(2)/X(4)
0830	Tower = 25.9 mK, Still = 0.060 mbar, G1/G2 = 182/166 mbar, 1K Pot = 1.716 K / 40 mbar. MB = 68.9% (predicted level: 72.1%)
0830	Lab = 23.4 C, Humidity = 41%
0835	Fill LN2 cold trap bath. Dewar empty, not sure whether it filled completely.
	Overnight: took charge-bias-scan data. Last flash occurred at 00:26 am. No indication of elevated tower temperatures after biasing. Actually it looks like a DAQ crash occurred. The 00:26 flash would have been after the 5th series, at -1/+1 V. /byseries contains 5 series starting yesterday at 17:41, with the correct amount of dumps. So it looks like the crash occurred during the cooldown period between 00:26 and 00:51. MIDAS web page is down.

cdms2:online cdmssoft$ps -u cdmssoft

  PID TTY          TIME CMD
14568 pts/0    00:00:00 bash
14773 ?        00:00:09 mserver
14775 ?        01:04:18 mlogger
14779 ?        00:03:27 lazylogger
14860 ?        00:00:51 dcrc_driver.exe
14863 ?        06:07:52 towerfe3.exe
14865 ?        09:59:38 triggerfe2.exe
32369 ?        00:01:24 mserver
63692 pts/0    00:00:00 ps

Report entered on crash report page

	As seen above the http process is not running. We'll try to kill then restart MIDAS.
0850	Execute the kill script. This stopped most of the programs but not dcrc_driver, towerfe3, or triggerfe2. Try executing the start script.
0850	This seems to have worked. Sequence has restarted itself. It appears to be taking data now. A new series has begun, 07170719_0849. DCRC Control shows bias of -1.5/1.5 V. Difficult to say whether bias was set just now or hours ago, so not certain whether we're in a good neutralization state. But probably it was set just now, and the sequence can continue normally.
0855	Looking at BatViewer it appears that triggers are happening too frequently, very few pulses are in the right place.
0856	Increase DCRC1 q[0] threshold from 45 to 100
0905	Check BatViewer again, pulse rate looks reasonable. Checking previous series, the first 4 look ok - but the 5th one at -1/+1 looks like mostly random triggers. Possibly the noise state of DCRC1 q[0] changed.
1100	Set Sequencer to terminate after -2/2V series(07170719_1015).
1129	Flash detector for 30s.
1246	mhttp seems to have crashed again. Repeating the above procedure restores it.
1250	Realize that terminating the above sequence early left the detector biased. Turn off bias in odb and flash again.
1335	Tower/MC/Coldplate = 26.6/30.3/184 mK, Still = 1.23 K / 0.065 mbar, G1/G2 = 188/173 mbar, 1K Pot = 1.71 K / 38 mbar.
1352	Based on preliminary Charge Collection Efficiency results and phonon baseline shifts with voltage bias, decide on Side1/2=-/+ 2V bias for this detector.

1502	Fill LN2 cold trap full.
1525	Complete DCRC1PA IbIs at 2/-2 V bias.
1700	Complete DCRC1PC IbIs at 2/-2 V bias.
1711	Fill LN2 cold trap full.
1852	Take short test series triggering on testSignal, with testSignal connected to DCRC1PA with 100Hz, DDSADCScaling=4
1859	Begin test frequency scan sequence, “testSigScan_log.msl”. Not writing as cdms series, series numbers 7855-7885.

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