2019/06/19 (Wednesday)
| Setup | DIB1/3/4 → 3.2 MHz filters 2/3/1 → cable 3/1/2 → gender changer ?/3/2 → HVConn 1/3/2 → HV 1/2 → DCRCX(4)/DCRC55(1) DCRC33(2) → 1kV power supply → HV input Three walls of the lead/poly shield are up. |
|---|---|
| 0700 | Unrail DCRC4pB by adjusting driver offset |
| 0710 | Start an 87 min series at HV = 180→400V, rate 2.52V/min, with 10% prebias for 2 minutes, flash at end with 30 min wait. CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = (490/400/490)/(420/480/450) uA, Front-End Gains = (2/2/3)/(5/5/5) 1000 BOR, 5Hz InRun, and 1000 EOR randoms, trigger on DCRC1pB/C/D threshold = 10/10/10. Use sequence HVdrift_180V_cal0612_2p52VPM_prebias_10_2_dur_87min_flashDCRC_1_4.msl |
- note that the 10/10/10 trigger thresholds seem to be well above the noise. They may be cutting into the 1keV peak a little bit. We'll try reducing them to 8/8/8
| 0902 | Fill LN2 cold trap bath |
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| 0933 | Tower/MC/Coldplate = 41.7/31.5/197 mK, Still = 1.25 K / 0.090 mbar, G1/G2 = 157/152 mbar, 1K Pot = 1.63 K / 22 mbar. MB = 71.9% updated 10 minutes after a flash |
| 1027 | Start an 87 min series at HV = 180→400V, rate 2.52V/min, with 10% prebias for 2 minutes, flash at end with 30 min wait. CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = (490/400/490)/(420/480/450) uA, Front-End Gains = (2/2/3)/(5/5/5) 1000 BOR, 5Hz InRun, and 1000 EOR randoms, trigger on DCRC1pB/C/D threshold = 8/8/8. Use sequence HVdrift_180V_cal0612_2p52VPM_prebias_10_2_dur_87min_flashDCRC_1_4.msl |
| this data looks pretty good. Let's try somewhat lower thresholds. | |
| 1332 | Start an 87 min series at HV = 180→400V, rate 2.52V/min, with 10% prebias for 2 minutes, flash at end with 30 min wait. CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = (490/400/490)/(420/480/450) uA, Front-End Gains = (2/2/3)/(5/5/5) 1000 BOR, 5Hz InRun, and 1000 EOR randoms, trigger on DCRC1pB/C/D threshold = 7/7/7. Use sequence HVdrift_180V_cal0612_2p52VPM_prebias_10_2_dur_87min_flashDCRC_1_4.msl |
| 1400 | Fill LN2 cold trap bath. |
| trigger thresholds | write rate (Hz) | written in-run randoms rate (Hz) | write efficiency | calculated event rate (including randoms) (Hz) |
|---|---|---|---|---|
| 6/6/6 | 70 | 1.25 | 25% | 280 |
| 7/7/7 | 66 | 2.6 | 52% | 127 |
| 8/8/8 | 60 | 4.0 | 80% | 75 |
| 10/10/10 | 60 | 4.1 | 82% | 73 |
| 15/15/15 | 57 | 4.6 | 92% | 62 |
| 1709 | Start an 87 min series at HV = 180→400V, rate 2.52V/min, with 10% prebias for 2 minutes, flash at end with 30 min wait. CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = (490/400/490)/(420/480/450) uA, Front-End Gains = (2/2/3)/(5/5/5) 1000 BOR, 5Hz InRun, and 1000 EOR randoms, trigger on DCRC1pB/C/D threshold = 8/8/8. Use sequence HVdrift_180V_cal0612_2p52VPM_prebias_10_2_dur_87min_flashDCRC_1_4.msl |
|---|---|
| 1944 | Start an 87 min series at HV = 180→400V, rate 2.52V/min, with 10% prebias for 2 minutes, flash at end with 30 min wait. CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = (490/400/490)/(420/480/450) uA, Front-End Gains = (2/2/3)/(5/5/5) 1000 BOR, 5Hz InRun, and 1000 EOR randoms, trigger on DCRC1pB/C/D threshold = 8/8/8. Use sequence HVdrift_180V_cal0612_2p52VPM_prebias_10_2_dur_87min_flashDCRC_1_4.msl |
| 2304 | Start an 87 min series at HV = 180→400V, rate 2.52V/min, with 10% prebias for 2 minutes, flash at end with 30 min wait. CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = (490/400/490)/(420/480/450) uA, Front-End Gains = (2/2/3)/(5/5/5) 1000 BOR, 5Hz InRun, and 1000 EOR randoms, trigger on DCRC1pB/C/D threshold = 8/8/8. Use sequence HVdrift_180V_cal0612_2p52VPM_prebias_10_2_dur_87min_flashDCRC_1_4.msl |