2012/07/30

0938	DAQ error occurred at 05:35 this morning because Port 5000 of DCRC32 was not released after a series, all boards are still alive though. Tower temperature 78.2mK.

# Data taken in the last run
# DIB1=-2V
1.2G    ./07120729_1929
1.2G    ./07120729_2019
1.2G    ./07120729_2109
# DIB1=-4V
1.4G    ./07120729_2200
1.4G    ./07120729_2250
1.4G    ./07120729_2340
# DIB1=-6V
928M    ./07120730_0031
1.1G    ./07120730_0122
1.1G    ./07120730_0212
# DIB1=-8V
405M    ./07120730_0304
406M    ./07120730_0355
433M    ./07120730_0446

0950	Start flashing the detector for 1 hour.
1010	Fed Cricket 3 pellets.
1105	Filled LN2 cold trap.
1303	Need to clean the cold traps. Will leave mixture that's in the fridge there and pump the rest to the dump. Close condenser line speedivalve, V6, V13 A/B. Open V12A/B, 9, 5.
1436	Removed DCRC boards. Pulled out cold traps. Pumping on cold traps with He-4 pump, waiting for them to warm up to room temperature.
1700	Fed Cricket 4 pellets.
1708	Heated cold traps. Entered cold traps back into respective baths. Helium cold trap not able to go back in all the way.
1730	Re-started 1K pot
1751	Begin LHe transfer (8.4%).
1845	End LHe transfer (91.9%).
	Filled LN2 cold trap.
1911	Re-commence circulation.
1954	The temperature dropping rate significantly decreased around MC = 103mK. G2=57mbar, G1=47mbar. There was still a large pressure difference across the N2 cold trap.
2002	Added N2 cold trap 2 into circulation. The pressure difference of G2 and G1 reduced and the temperature dropped faster.
2014	MC=92.8mK. Temperature dropping rate starts to decrease again. G2=42mbar, G1=45mbar, P1=0.045mbar. Still=4.55kOhm.
2017	Add 2mW heating power to still. P1 goes up to 0.075mbar. Still=4.47kOhm. G2=44.8mbar, G1=49mbar.
2022	MC=89.5mK and cools very slowly. Turn off the still heater. The He cold trap may still have a large impedance.
2028	Unplug all DCRC's in case they are heating up the fridge. No obvious effect observed MC=89.5mK.
2136	DCRC33 refuse to power up. Not even to take charge data. I'll flash the detectors.
2141	Flash detector with LED1 on DIB3/DCRC31, LED1&2 on DIB2/DCRC32. ON=100us, OFF=5000us, current=-0.6mA.