2012/02/12

0042	Start taking data at +1, +3, +5, +7, +9, +10V with Ba source. Tower temperature 78mK, not stable.
	Below are a few raw pulses for +1V and +3V bias. Low energy events appeared again in the spectra.
+1 V

+3 V

1056	A daq error occurred at 07120212_0733_F0001 after randoms.
	1K pot 1.326K fairly low. Tower temperature 641mK. G1=780mbar, G2=703mbar. Fridge stopped working properly.

1103	Open V9, close V13A, pump mixture into dump, G2 rise to 182mbar.
	Close V6, condenser speedivalve, open V5, pump the mixture in the condenser line into dump, G2 rise to 200mbar.
	Can feel strong vibration at the top the fridge.
1114	Power off two DCRC's.
1200	Filled LN2 cold trap.
1232	Begin LHe transfer (0%)
1320	End LHe transfer (73%)
1537	Circulation didn't seem to work. Close condenser speedivalve and pump both the He cold trap and N2 cold trap.
1931	Pull out He cold trap. G1 rise to 37mbar then drops. Pull out N2 cold trap 1.
2135	Put N2 cold trap and He trap back into the dewars. Try to start circulation but V6 doesn't respond.
2310	V6 set screw was broken. This is the second time it's broken. The valve is very tight. May need some maintenance. Opened V6 manually, the fridge is running fine now. Temperature 166mK and dropping.