2018/08/24 (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) 1.1kV → NaI B/C → Ortec 452(gain=5, shaping = 6 us, output=10V) / Ortec 575A(gain=10, shaping = 3us) → DCRCX(4) DCRC33(2) → kepco 1kV power supply → HV input |
|
| status: Took SiHV+NaI PuBe data overnight. | |
| 0845 | Tower/MC/Coldplate = 30.3/29.0/179 mK, Still = 1.3±0.1 K / 0.070 mbar, G1/G2 = 116/119 mbar, 1K Pot = 1.61 K / 20 mbar, Turbo on IVC = 1.0 nbar, MB = 74.5% |
| 0850 | Fill LN2 cold trap bath |
| 1246 | Shift PuBe source south until it is centered just south of the Cryostat lead shield's south wall. Source is now near south-west corner of fridge frame. |
| 1248 | Start 1 hr NaI calibration dataset Looking for PuBe gamma structure 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 DCRC4pA/B threshold = 2/2 |
| 1400 | The Ortec amplifiers may be saturating at a few MeV. Still evaluating, but let's try moving the attenuators to the input of the amplifiers and take one more spectrum in this mode. |
| 1402 | Start 1 hr NaI calibration dataset Looking for PuBe gamma structure NaI detector: 1.1kV → NaI B/C → x10/x10 attenuator → Ortec 452(gain=5, shaping = 6 us, output=10V, Pos) / Ortec 575A(gain=10, shaping = 3us, Pos) → DCRC4PB/PA, Driver Gains = 1/1, PhononWaveFormLength = 1024 (512 samples), PhononPrepulseSamples = 64 (64 samples) 1000 BOR randoms, trigger on DCRC4pA/B threshold = 2/2 |
| 1445 | Stop run early. Triggering only on noise. Increase triggers to DCRC4pA/B threshold = 7/5. Also realise NaI B amplifier output was still plugged into the scope, not the DCRC! Fix this. |
| 1451 | Start 30min NaI calibration dataset Looking for PuBe gamma structure NaI detector: 1.1kV → NaI B/C → x10/x10 attenuator → Ortec 452(gain=5, shaping = 6 us, output=10V, Pos) / Ortec 575A(gain=10, shaping = 3us, Pos) → DCRC4PB/PA, Driver Gains = 1/1, PhononWaveFormLength = 1024 (512 samples), PhononPrepulseSamples = 64 (64 samples) 1000 BOR randoms, trigger on DCRC4pA/B threshold = 7/5 |
| 1600 | Return NaI attenuators to amplifier outputs. |
| 1630 | Network problem: /data/cdms1 is inaccessible. This is the path to the raw data. We can't process data, and we can't look at data with BatViewer. Tried taking data with MIDAS with logger on. Data run immediately stops itself. Checked Messages - but this causes MIDAS to crash. I think Messages needs /data/cdms1. |
| 1650 | Move PuBe source barrel back to its central position behind the west shield wall. |
| 1655 | Fill LN2 cold trap bath |