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2016/08/22 (Monday)

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Setup: iZIP mode, DIB1/2/3 → 3.2 MHz filters → cables → DCRC55(1)/33(2)/50(3), Tower has been cooled below Al transition with mu-metal shield 48.4 cm below standard position
DCRCs powered overnight. Pumping on IVC with turbo pump overnight. Baked detector for 12 hours overnight, Tower at 0.4 K until 03:59.
0830 Tower/MC/Coldplate = 38.6/32.8/151 mK, Still = 1.27 K / 85 μbar, G1/G2 = 195/180 mbar, 1K Pot = 1.52 K / 4.5 mbar, MB = 71.6%.
Boiloff rate: good. Yesterday pressure was released at 8min and 30min after filling to 91.5%.
0835 Fill LN2 cold trap.
0840 Check phonon pulses, adjust a few driver offsets, set all baselines near -0.7 or -0.8.
Attempt to fix timing link by resetting it in the telnet sessions.
0844 Start short test data series at 0/0 V with DIB2 FETs off with FG=5/2/5, OG=8/3/8, with 500 initial randoms, 500 ending randoms. Trigger on DIB1 phA with threshold of 30ADC bins, with 150 us pileup cut window.
Data from this run seems to have proper synchronization between the three DCRCs.
0851 With DIB2 FETs turned off on the ODB, Start three sets of 30min background series at -6/+6 V with FG=5/2/5, OG=8/3/8, with 1000 initial randoms, 1000 ending randoms. Trigger on DIB1 phA with threshold of 30ADC bins, with 150 us pileup cut window.
1035 The flash before the third series occurred on schedule but data taking did not start, there's a failure with MIDAS communicating with cdms2….
1046 Refresh mserver frontend on cdms2 according to the procedure. After doing this, the website is back, and the data set is running, though the detector may have been biased for this entire time…
1305 Commence closing V6 to begin warm up procedure. IVC pressure at 1.0nbar. Isolate turbopump to let He accumulate.
1312 Lower mu-metal shield to 43.9cm below standard height (should be an attenuation factor of 6).
1314 V6 closed, close V13B, turn off He3 pump, turn on MC Heater to 1.0mW.
1340 Tower jumps from 1.25 K → 3.25 K, IVC = 250 nbar. G1 fell to 25 mbar then began rising.
1350 Tower = 3.4K. IVC pressure = 300nbar. Begin turbopumping IVC. Turn off MC Heater to let tower start cooling.
1400 G1 peaked at 150 nbar, Tower peaked at 3.4 K, both falling now.
1420 Tower temp = 2.2K and stable. G1/G2 stable at 70/111 mbar. Turn on He3 pump, open V13B. Begin opening V6.
1510 Still (P1) reaches readable levels at V6=13.7%, Tower = 1.4 K, G1/G2 = 260 mbar.
1615 V6 = 14.9%, Tower = 400 mK, G1/G2 = 270 mbar, Still = 1.2 mbar. Open V6 100%.
1655 Fill LN2 cold trap super full.
1715 Tower temp = 39.9mK. Raise mu-metal shield to standard position. Check phonon channels, and adjust Driver Offsets.
Detector has been cooled below Al transition with mu-metal shield 43.9cm below standard position
1718 Commence 12 hour bake.

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