2018/09/28 (Friday)
| 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 → DCRC55(1)/DCRC50(3) NaI detector: 1.1 kV (for real) → NaI B/C (dynodes terminated) → Ortec 450(Neg input, gain=5, shaping = 5 us integration, output=+10V)/ Ortec 575A(Neg input, gain=5, shaping = 3 us) → x10/x10 attenuator → DCRCX(4) PB/PA DCRC33(2) → kepco 1kV power supply → HV input |
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| status: | PuBe -125V data overnight, tower = 30.0 mK |
| 0855 | Tower/MC/Coldplate = 30.0/30.5/188 mK, Still = 0.0 mW / 1.4±0.1 K / 0.090 mbar, G1/G2 = 122/112 mbar, 1K Pot = 1.59 K / 17 mbar, Turbo on IVC = 0.86 nbar, MB = 38.5% |
| 0900 | Fill LN2 cold trap bath. |
| 0910 | MIDAS crash of some sort. The last series was 07180928_0531 which was the 5th in its block of 12. Detector has been biased at -125V since 4:51. |
| 0915 | Restart MIDAS and DAQ programs. Sequence did not restart, had some error. Dial HV down to zero using change_HV_125_to_0_DCRC2_250V.msl. |
| 0920 | Flash DCRCs 1,3 for 30 seconds |
| 1003 | Start 8x2hr PuBe series at HV = -125 V with 15% prebias for 5 min, split into 10 min subruns, with CDMS and NaI detectors running and DCRC2 as HV controller. Using sequence HVscan-125×8-15_5PreBias-DCRC2_250V-30Flash-30wait-2hrData-10minSubRun.msl CDMS detector: Driver Gains = 2x, QET biases = (280/260/305)/(140/280/295) uA, Front-End Gains = (10/10/10)/(10/15/10) NaI detector: 1.1 kV (for real) → NaI B/C (dynodes terminated) → Ortec 450(Neg input, gain=5, shaping = 5 us integration, output=+10V)/ Ortec 575A(Neg input, gain=5, shaping = 3 us) → x10/x10 attenuator → DCRCX(4) PB/PA, Driver Gains = 1/1, PhononWaveFormLength = 1024 (512 samples), PhononPrepulseSamples = 64 (64 samples) 1000 BOR randoms, trigger on DCRC3pB/C/D threshold = 7/10/9 |
| 1340 | Base temp rises slowly to 30.2 mK. No other apparent change. |
| 1520 | Stop sequence during pause after flash |
| 1530 | Begin LHe transfer @ MB = 28.8% Waited about 10 minutes after transfer stick was fully inserted before turning on heater on 250L Dewar to 4 psig. (Not pressurizing with He gas.) Dewar pressure rises to 4 psi, MB pressure on wall gauge about 1 psi, later rises to about 2 psi |
| 1605 | Unrail DCRC1pB, DCRC3pB |
| 1610 | Finish LHe transfer @ MB = 93.0% |
| 1620 | Fill LN2 cold trap full. |
| 1630 | After further analysis of the NaI spectra, two peaks were identified in the Ortec 450 spectra which do not appear with other amplifiers. They are now suspected to be some sort of glitch or noise from the amplifier. So, we will now go to the following NaI setup: 1.1 kV (for real) → NaI B/C (dynodes terminated) → Ortec 452(Neg input, gain=2.5, shaping = 6 us, output=+10V)/ Ortec 575A(Neg input, gain=5, shaping = 3 us) → x10/x10 attenuator → DCRCX(4) PB/PA |
| 1709 | Temp bounced around a bit during transfer at times corresponding to turning on the heater and ending the transfer. Now has settled to 30.4 mK |
| 1710 | Start 8x2hr PuBe series at HV = -125 V with 15% prebias for 5 min, split into 10 min subruns, with CDMS and NaI detectors running and DCRC2 as HV controller. Using sequence HVscan-125×8-15_5PreBias-DCRC2_250V-30Flash-30wait-2hrData-10minSubRun.msl CDMS detector: Driver Gains = 2x, QET biases = (280/260/305)/(140/280/295) uA, Front-End Gains = (10/10/10)/(10/15/10) NaI detector: 1.1 kV (for real) → NaI B/C (dynodes terminated) → Ortec 452(Neg input, gain=2.5, shaping = 6 us, output=+10V)/ Ortec 575A(Neg input, gain=5, shaping = 3 us) → x10/x10 attenuator → DCRCX(4) PB/PA, Driver Gains = 1/1, PhononWaveFormLength = 1024 (512 samples), PhononPrepulseSamples = 64 (64 samples) 1000 BOR randoms, trigger on DCRC3pB/C/D threshold = 7/10/9 |