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Table of Contents

2011/03/22

0022 Begun new Ba-133 run 07110322_0020. Bias -4V on Q1-4. Trigger: Q1 OR Q2 OR Q3 OR Q4. Threshold: 64 ADC bins.
0030 Tower temperature at 63.3 mK.
0922 Stop the run 07110322_0020 at File 182
0935 Flash the detectors and fill N2 cold trap full
1004 Begun Helium Transfer.
1906 EventTime is fixed.
1907 Unplugged the power the DCRC30 on zip2 (DIB1) and the large noise on Qo (Q3) of zip1 was still there.
1909 Unplugged the power DCRC33 on DIB2.
1926 Bridging the analog grounds of the two boards had no effect to the noise. RMS noise: Q1~0.8mV, Q2 and Q4 ~1mV, Q3~1.2mV.
1947 Measure RMS noise. Q1: 1.0 mv; Q2: 1.06 mV; Q3: 1.56 mV; Q4: 1.22mV. The trigger threshold can be set at Q1 = 48 ADC bins, Q2 = 51, Q3= 75, Q4 = 59.
2007 Flash detector
2048 Stop flashing
2117 Modified trigger setting vi so that I can set threshold on each channel independently.
2136 Fill N2 cold trap full
Flash detector

Data & Plots

Fig 1. Charge noise psd vs. bias
Each curve was an average of 10 1.6384ms-long traces. All traces were manually selected to make sure they didn't contain pulses.
Fig 2. Spectrum of Q1-4 as primary channels
The cuts cq# was defined as max(q1, q2, q3, q4) == cq#, where # is 1 to 4. From data set 07110322_0020.
Fig 3. Charge partition at different primary channels
From data set 07110322_0020
Fig 4. Qsum spectrum
Q1 and Q2 were calibrated independently before they were added together. The cut cqo removed the q-outer events. From data set 07110322_0020

-4V overnight neutralization

Data:

07110322_0020

Script

Plots