| | Setup: DIB1/3/4 → 3.2 MHz filters 3/1/2 → cable 3/1/2 →gender changer 3/1/2 → HVConn 1/3/2 → HV 1/2 → DCRC55/DCRC33 |
| | PuBe source in paraffin barrel behind shield (west side) |
| 0945 | Fill LN2 cold trap. |
| 1535 | Fill LN2 cold trap. |
| 1557 | Set HV=65V After 5 mins, reduce to 50V. |
| 1618 | HV=50.01 V, V_test=2.6mV → V_det=48.87 V |
| 1623 | Reduce NaI trigger level to ~140mV to reduce possible crosstalk. |
| 1631 | Trying to get DCRC4 triggering on this new, smaller signal. Reduced threshold to 500ADC bins and sample length to 3. Looking at single triggers works for a couple of triggers, but after that the SQUID tuning gui freezes. |
| 1638 | Switch back to normal TTL trigger with standard external trigger conditions (baseline/sample/threshold=16/5/1500) |
| 1641 | Start 20 1-hour data series of 1-sided 50V HV coincidence data with Frontend Gain = (15/15/4)/(3/5/2), OG = 4/2, QET biases = table from Apr 28, with 1000 beginning randoms, no flashing, and a 1500ADC bin threshold trigger on DCRC4 pA (external NaI trigger). Running OR trigger of NaI detectors with PuBe source on west side of shield. NaI detector C has 311 mV threshold and detector B has 288 mV threshold We want the small external trigger after all. |
| 1645 | Switch back to ~140mV external trigger, but keep standard external trigger settings |
| 1646 | Start 20 1-hour data series of 1-sided 50V HV coincidence data with Frontend Gain = (15/15/4)/(3/5/2)(15/15/4)/(3/5/4), OG = 4/2, QET biases = table from Apr 28, with 1000 beginning randoms, no flashing, and a 1500ADC bin threshold trigger on DCRC4 pA (140mV external NaI trigger). Running OR trigger of NaI detectors with PuBe source on west side of shield. NaI detector C has 311 mV threshold and detector B has 288 mV threshold |
| 1650 | No triggers coming in, reduce DCRC4pA trigger to 500ADC bins. |
| 1654 | Still no triggers coming in, reduce DCRC4pA trigger width to 3 bins. |
| 1658 | Looks like it's triggering well now (dump 8) |