2018/09/24 (Monday)
| 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) 1.1kV → NaI B/C → Ortec 452(gain=5, shaping = 6 us, output=10V) / Ortec 575A(gain=10, shaping = 3us) → x10/x10 attenuator → DCRCX(4) DCRC33(2) → kepco 1kV power supply → HV input |
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| status: | PuBe -125V data overnight, DCRC3pC railed, tower = 29.9 mK |
| 0948 | Fill LN2 cold trap. |
| 0950 | Stop sequence after flash. |
| 1038 | Tower/MC/Coldplate = 30.0/30.5/182 mK, Still = 0.0 mW / 1.1±0.1 K / 0.095 mbar, G1/G2 = 128/124 mbar, 1K Pot = 1.60 K / 17 mbar, Turbo on IVC = 0.86 nbar, MB = 37.2% |
| 1100 | Playing with NaI amplifiers. Use Ortec EasyMCA to digitize standard PuBe spectrum from NaIB with Ortec 452 instead of DCRC. Spectrum looks the same. Try various combinations of amplification, polarity with no real change in spectral shape. |
| 1124 | Accidentally start taking data with the Pulse Viewer. |
| 1130 | Remove lead from right half of south shield wall. Shift PuBe source to southeast corner of fridge, near turbo pump so it has a line of sight to both NaI detectors. Take a spectum using NaIB w/standard amplifier setup (negative polarity) and the EasyMCA DAQ. |
| 1144 | Start 24 min NaI PuBe calibration dataset with NaI detector: 1.1kV → NaI B/C → Ortec 452(gain=5, shaping = 6 us, output=10V, Neg) / Ortec 575A(gain=10, shaping = 3us, Neg) → x10/x10 attenuator → DCRC4PB/PA, Driver Gains = 1/1, PhononWaveFormLength = 1024 (512 samples), PhononPrepulseSamples = 64 (64 samples) 1000 BOR randoms, trigger on DCRC4pA/B = 5/5 |
| 1215 | Return PuBe to standard position behind lead pile at west wall. Replace south lead wall. |
| 1227 | Start 1x2hr 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: 1.1kV → NaI B/C → Ortec 452(gain=5, shaping = 6 us, output=10V, Neg) / Ortec 575A(gain=10, shaping = 3us, Neg) → x10/x10 attenuator → DCRC4PB/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 |
| 1537 | Stop sequence a little bit into the 2nd series of data (07180924_1535). Turn down bias in preparation for LHe transfer. |
| 1548 | Start LHe transfer (MB = 29.4%) |
| 1649 | End LHe transfer (MB = 93.1%) |
| 1650 | The NaI detector C spectra have consistently had some weird features above 5MeV which I'm not sure are physical. Switch out the NaIC amplifier giving the following setup: NaI detector: 1.1kV → NaI B/C → Ortec 452(gain=5, shaping = 6 us, output=10V, Neg) / Ortec 450(gain=5, shaping = 5 us integration, Neg input) → x10/x10 attenuator → DCRC4PB/PA |
| 1654 | 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: 1.1kV → NaI B/C → Ortec 452(gain=5, shaping = 6 us, output=10V, Neg) / Ortec 450(gain=5, shaping = 5 us integration, Neg input) → x10/x10 attenuator → DCRC4PB/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 |
| 1710 | Fill LN2 cold trap full. |