2016/07/29 (Friday)

Previous Day

	Setup: iZIP mode, DIB1/2/3 → cables → 3.2 MHz filters → DCRC55(1)/33(2)/50(3), Tower has been cooled below Al transition with mu-metal shield at standard position
	DCRCs were powercycled yesterday. DCRCs on overnight. Baked detector for 12 hours last night. Tower temperature held at 0.4 K then fell at 5:54.
0830	Tower/MC/Coldplate = 40.1/28.2/155 mK, Still = 1.31 K / 0.070 mbar, G1/G2 = 200/185 mbar, 1K Pot = 1.53 K / 5.5 mbar, MB = 48.0% Boiloff rate not very good this time. We only let pressure out once yesterday. It was a low fill - but it seems that even with the low fills you have to let out pressure multiple times.
	MC, Coldplate, Still all colder today, Tower a little colder than yesterday morning, certainly better than later yesterday.
0840	Fill LN2 cold trap bath.
0845	Checking phonons. DCRC Control → Settings is partially unresponsive: when the Edit window is open, changing the Driver Offset on DIB1pA didn't transfer to the ODB. But changing the value in the box on the graphical interface worked.
0905	Trouble with DIB1pD, no pulses, somewhat jagged noise. Increased TES bias from 100.8 to 120 μA and pulses return.
0915	DIB2pA and DIB2pB not showing pulses. Adjustments to TES bias didn't seem to help.
1543	Commence LHe transfer (33.3%).
1617	End LHe transfer (92.9%).
1623	Let pressure out of main bath.
1655	Messing around with modulation curves and SQUID tuning on DCRCs 1-3. Fridge begins heating after a zap, but levels off at ~65mK then begins rising more. Regular enveloped jagged noise appears on DIB2 Qi channel (no noise on DIB2 Qo). Attempt to heat FETs on DIB2, with no effect. Unpowering DCRCs causes temperature to begin dropping.
1730	Fridge temperature cools down to ~65 mK, then begins rising (up to a max of 125 mK), and falling (to a low of 95mK) for about two cycles.
1735	Power down HPGe crystal voltage and shutoff voltage and power supply. Top off with LN2 for the weekend.
1750	Filling LN2 coldtrap full has brought the temperature down (currently to 60 mK but still dropping slowly). Let it be known that Allison fixed the problem. The problem was not believing in ourselves.
1803	Tower temp = 58 mK and rising, Still temp = 1.15 K, Cold Plate temp = 140 mK, G1/G2 = 208/193 mbar, P1=80 ubar, 1K Pot = 1.61 K/15 mbar.
1830	Tower temp = 50 mK and oscillating w/ a downward trend, Still temp is still 1.13 K, Cold Plate temp = 141 mK, G1/G2 = 204/187 mbar, P1 = 75 ubar, 1K Pot = 1.599 K/12 mbar. Tweak open 1K Pot.

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