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2011/08/29

0949 Tower temperature jumped from ~500mK to ~400mK at 23:30 last night. Tower temperature 394mK. G1=111.3mbr, G2=111.4mbar, P1=0.11mbar, P2=5.5mbar, 1K pot=1.555K. Stop flashing detector.
1405 Fill N2 cold trap full.
1814 Power up two DCRC boards. A temperature from 62mK to 69mK popped up.
1829 Start taking data 07110829_1849_F0001. -4V bias. Trigger on Q1-4. Am-241 on opposite side of Q2. Data/flashing/cooldown = 120/0.1/20 min. Take 4 series at this bias then switch to +4V.
Event rate ~9Hz. Trigger thresholds might be too low.
1854 Set trigger thresholds at 48ADC bins on all 4 charge channels. Event rate >30Hz.
1858 The event rate varies from 35Hz to 17Hz. This is likely due to the way the DAQ handles the triggers. Q4 has a waggle baseline. It may be a good idea not to trigger on it.