| | Setup: DIB1/3/4 → SL 27/19/20 → 3.2 MHz filters → cables 2,1,3 → HV board inputs 1,3,2 → HV board outputs 1,2 → DCRC55(1)/50(3). DCRC4 → HV power supply. PuBe source present. |
| 0705 | Let's do some tests of the live fraction, i.e. at what rate are triggers lost because (apparently) the DAQ can't keep up. We'll take some randoms data at different randoms rates. |
| 0709 | Start 10-minute PuBe data series at HV = 0V, Driver Gains = 2x, QET biases = 480/360/440/480/380/490 uA, Front-End Gains = 10/5 on DCRC1/3, 5 Hz randoms |
| 0721 | Start 10-minute PuBe data series at HV = 0V, Driver Gains = 2x, QET biases = 480/360/440/480/380/490 uA, Front-End Gains = 10/5 on DCRC1/3, 10 Hz randoms |
| 0732 | Start 10-minute PuBe data series at HV = 0V, Driver Gains = 2x, QET biases = 480/360/440/480/380/490 uA, Front-End Gains = 10/5 on DCRC1/3, 20 Hz randoms |
| | So far the DAQ seems to be keeping up, judging from counts per individual dumps using BatViewer. |
| 0743 | Start 10-minute PuBe data series at HV = 0V, Driver Gains = 2x, QET biases = 480/360/440/480/380/490 uA, Front-End Gains = 10/5 on DCRC1/3, 30 Hz randoms |
| 0754 | Start 10-minute PuBe data series at HV = 0V, Driver Gains = 2x, QET biases = 480/360/440/480/380/490 uA, Front-End Gains = 10/5 on DCRC1/3, 40 Hz randoms |
| 0804 | Start 10-minute PuBe data series at HV = 0V, Driver Gains = 2x, QET biases = 480/360/440/480/380/490 uA, Front-End Gains = 10/5 on DCRC1/3, 50 Hz randoms |
| 0815 | Start 10-minute PuBe data series at HV = 0V, Driver Gains = 2x, QET biases = 480/360/440/480/380/490 uA, Front-End Gains = 10/5 on DCRC1/3, 60 Hz randoms |
| 0827 | Start 10-minute PuBe data series at HV = 0V, Driver Gains = 2x, QET biases = 480/360/440/480/380/490 uA, Front-End Gains = 10/5 on DCRC1/3, 80 Hz randoms |
| | This is the first case for which the DAQ did not seem to keep up. Dump 5 contains 3920 events, so the read rate is about 65 Hz. |
| 0838 | Start 10-minute PuBe data series at HV = 0V, Driver Gains = 2x, QET biases = 480/360/440/480/380/490 uA, Front-End Gains = 10/5 on DCRC1/3, 100 Hz randoms |
| | Dump 5 contains 4040 events, so the read rate is about 67 Hz. |
| | So, in randoms mode, the DAQ can handle event rates up to 60 Hz in the current configuration. However in recent background triggered data the read rate seems significantly less than the raw event rate. For example using a WKmax threshold cut and comparing randoms to triggered events one recent run showed a 30 Hz raw rate and a 19 Hz rate in triggered data. |
| 1000 | Tower/MC/Coldplate = 21.5/24.3/155 mK, Still = 1.3 K / 0.100 mbar, G1/G2 = 243/224 mbar, 1K Pot = 1.62 K / 26 mbar, MB = 29.1% |
| 1014 | Remove PuBe source from lab and move it to storage container in PAN 443 |
| 1027 | Dial HV up to 70 V with 15% 5-minute prebias, using changeHV_0_70_preBias15_5.msl |
| 1040 | Estimate event rate from random traces. Set PhononWaveformLength on DCRC1 to 131072 which is 52.4288 ms and counted visible pulses in 70 pA traces. Counted 126 pulses in 3.67 seconds, so event rate is around 34.3 ± 3.1 Hz. |
| 1043 | Start 66-minute background data series at HV = 70V, Driver Gains = 2x, QET biases = 480/360/440/480/380/490 uA, Front-End Gains = 10/5 on DCRC1/3, 1000 initial randoms, trigger on DCRC3pD (Side1pF) threshold = 14 |
| 1044 | HV = 69.85 V, V_leak = 3.21 mV |
| 1148 | Stop data series. |
| 1149 | Dial HV from 70 V down to 0 V using changeHV_70_0.msl |
| 1150 | Bring PuBe source back into lab and place behind shield |
| 1200 | Flash detector for 30 seconds |
| 1231 | Fill LN2 cold trap. |
| 1250 | Start trigger rate sequence testSigTriggerRate.msl Takes 10 min series triggering internally on DCRC1 test signal at frequencies of 10,20,30,40,50,60,70,80,90,100 Hz. HV = 0V, Driver Gains = 2x, QET biases = 480/360/440/480/380/490 uA, Front-End Gains = 10/5 on DCRC1/3 |
| | Later: Every frequency had dumps with ~300 events, so read rates of 5Hz, even when using a 10Hz test signal… Using the pulse viewer and changing test signal frequency by hand indicates no triggers below 3 Hz, but rate does seem to increase as freq is raised above that. |
| | Checked a few of these series and, strangely, each had about 300 events per dump - the apparent event rate is 5 Hz. |
| 1415 | Fill LN2 cold trap full. |
| 1433 | Tower/MC/Coldplate = 21.2/25.3/149 mK, Still = 1.2 K / 0.100 mbar, G1/G2 = 243/223 mbar, 1K Pot = 1.62 K / 26 mbar, MB = 20.9% |
| 1440 | Start LHe transfer (MB = 20.9%) |
| 1550 | End LHe transfer (MB = 67.5%, dewar ran empty - will do another transfer tomorrow?) |
| 1741 | Start trigger rate sequence testSigTriggerRate.msl Takes 10 min series triggering internally on DCRC1 test signal at frequencies of 3,4,5,6,7,8,9,10,11,12 Hz. HV = 0V, Driver Gains = 2x, QET biases = 480/360/440/480/380/490 uA, Front-End Gains = 10/5 on DCRC1/3 |