— Matt Fritts 2018/09/06 09:35
2018/09/05 (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 → 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: | Took PuBe data overnight at -80V. Sequence continues today, last 2-hour dataset will be 14:33-16:33 |
| 0905 | Tower/MC/Coldplate = 31.2/29.9/185 mK, Still = 1.4±0.1 K / 0.070 mbar, G1/G2 = 125/114 mbar, 1K Pot = 1.60 K / 20 mbar, Turbo on IVC = 1.0 nbar. MB = 68.0% |
| 0910 | Fill LN2 cold trap bath. |
| 1540 | Stop data at end of 6th series in the last (10th) dataset of the sequence (halfway through the 2-hour dataset). Dial HV from -80V down to 0V with sequencer. |
| 1545 | Flash DCRCs 1,3 for 30 seconds |
| 1615 | Remove PuBe from paraffin barrel and hang it outside the lead wall, at about the same height it was at in the barrel. Barrel is now situated behind the source. |
| 1618 | Start 10 x 2hr no-paraffin-PuBe datasets at -80V split into 10min subruns, with CDMS and NaI detectors running and DCRC2 as HV controller. Using sequence HVscan-80×10-15_5PreBias-30Flash-30wait-2hrData-10minSubRun.msl CDMS detector: Driver Gains = 2x, QET biases = (280/260/305)/(140/280/295) uA, Front-End Gains = 10 NaI detector: 1.1kV → NaI B/C → Ortec 452(gain=5, shaping = 6 us, output=10V, Pos) / Ortec 575A(gain=10, shaping = 3us, Pos) → x10/x10 attenuator → DCRC4PB/PA, Driver Gains = 1/1, PhononWaveFormLength = 1024 (512 samples), PhononPrepulseSamples = 64 (64 samples) 1000 BOR randoms, trigger on DCRC3pB/D threshold = 7/9 |
| 1620 | Fill LN2 cold trap bath |