2011/12/06

0950	A DAQ error occurred at 23:58 yesterday. Shortly after the series 07111205_2357 started. Connection to both boards are both OK.

Data taken in the last run

# -2V Ba-133
1.5G    ./07111205_1951
1.5G    ./07111205_2111
1.5G    ./07111205_2232

1002	A DAQ error occurred when trying to start taking data.

1002	07111206_1003: flash detector for 6s and cooldown for 20 min.
1020	Filled N2 cold trap.
1030	07111206_1030_F0001 Started. Resuming take Ba data from +2V bias.
1432	Begun LHe transfer (34.8%)
1543	End LHe transfer (86.8%)

Data taken in the last run

# +2V Ba-133
1.4G    ./07111206_1030
1.4G    ./07111206_1150
1.4G    ./07111206_1310

+/- 2V Ba-133 Data

All figures below show order for individual charges: Top row- Q1, Q2; Bottom row- Q3, Q4

Cut applied to the following analyses: Primary charge channel cut

No strict Chi2 cut was applied to spectra - only simple threshold cuts

For brevity on this page, I supplied links to charge, chi2, and charge stdv. vs event time.

-2V Bias
Fig. 1 - Charge (1000 a.u.) vs. Event Time (sec) at -2V Bias
http://www.hep.umn.edu/cdms/cdms_restricted/K100/runs/run022/Voltage_Biases/n2V/20111205/v1_ba/q_et.png

Fig. 2 - Charge Stdv vs. Event Time (sec) at -2V Bias
http://www.hep.umn.edu/cdms/cdms_restricted/K100/runs/run022/Voltage_Biases/n2V/20111205/v1_ba/qstd_et.png

Fig. 3 - Chi2 vs. Event Time (sec) at -2V Bias
http://www.hep.umn.edu/cdms/cdms_restricted/K100/runs/run022/Voltage_Biases/n2V/20111205/v1_ba/qchi_et.png

Fig. 4 - Chi2 vs. Charge (1000 a.u.) at -2V Bias

Fig. 5 - Charge Spectra (1000 a.u.) at -2V Bias

+2V Bias
Fig. 6 - Charge (1000 a.u.) vs. Event Time (sec) at 2V Bias
http://www.hep.umn.edu/cdms/cdms_restricted/K100/runs/run022/Voltage_Biases/2V/20111206/v1_ba/q_et.png

Fig. 7 - Charge Stdv vs. Event Time (sec) at 2V Bias
http://www.hep.umn.edu/cdms/cdms_restricted/K100/runs/run022/Voltage_Biases/2V/20111206/v1_ba/qstd_et.png

Fig. 8 - Chi2 vs. Event Time (sec) at 2V Bias
http://www.hep.umn.edu/cdms/cdms_restricted/K100/runs/run022/Voltage_Biases/2V/20111206/v1_ba/qchi_et.png

Fig. 9 - Chi2 vs. Charge (1000 a.u.) at 2V Bias

Fig. 10 - Charge Spectra (1000 a.u.) at 2V Bias

1800	LS370 shows the error “VMIX OVL” error from time to time at temperature reading ~80mK. It seems there are a lot differential noise from the thermometer. The dewar is well shielded and there is no magnet in the fridge. The thermometer was taped well to the 30mK can. It's unlikely the noise is due to vibration of the wires. It's easy to understand there is common mode noise if the thermometer is shorted to the chassis. But I don't quite understand why there is differential noise.
	Anyway, first check if there is common mode noise in the signal. Turn off the “common mode noise reduction” in LS370. The temperature reading drops from 80mK to 76mK. It's likely the thermometer is shorted to the chassis.
	Check the thermometer lid to chassis resistance using Fluke 177 with auto range

1815	V- and I- are shorted to chassis. The thermometer was heated up a lot when measuring the resistance. There is still a lot differential noise stops me from using the smallest range to measure the resistance using LS370. Try monitoring the VMIX and see if there is any clue.
	When a BNC cable connects the oscilloscope and the “monitor” connector of LS370, the temperature jumped from ~76mK to ~74mK. Before this I already connected the cable shield to the chassis of the thermometry breakout box. This should not happen unless the LS370 signal shield is not connected to the cable shield and the shield integrity is broken. Check the cable connecting the breakout box and LS370.
	Found the cable shield is unsoldered from a pin on the DB15 connector. The shield wire is wrapped by Teflon tape. This breaks the shield integrity. Resolder them together.
	Put the cable back. Temperature reading drops to 62.2mK. And I can use the 63.2kΩ range to measure the 42kΩ resistance without overloading the mixer. The reading is much quieter and stabler.
2049	07111206_2048_F0001: Flash detector for 6s and cooldown for 20min. Will take Ba-133 data at +4, +6, +8, +10, +13V biases.