| | Setup: DIB1/3/4 → 3.2 MHz filters → cables 1,2,3 → HV board inputs 1,3,2 → HV board outputs 1,2 → DCRC55(1)/50(3) |
| | Background data at 100V with external NaI trigger going overnight |
| | Mysterious spikes in tower temperature occurred this morning, peaks ranging from 100 to 120 mK. They occurred at 5:52, 5:53, 5:54, 6:02, 6:56, 7:05, 7:10, and 7:13. This is the first time we left it biased at 100V overnight. Is there some sort of breakdown? |
| 0720 | Main bath = 37.7% |
| 0720 | Current data series has been going for 716 minutes. Stop data. |
| 0720 | HV = 100.0 V, Vtest = 12.2 mV |
| 0725 | Dial HV down to 0 V, then flash detector for 30 s |
| 0800 | Finish detailed IbIs of the normal region of DCRC3pD. Trying to better characterize the shape of the normal region. |
| 0805 | Estimate bkg event rate, count 32 pulses in 1 second so rate is about 32 Hz |
| 0807 | Dial HV up to 115 V for prebias, will leave for 5 minutes |
| 0810 | Fill LN2 cold trap bath |
| 0813 | Dial HV down to 100 V |
| 0815 | Pulses look pretty good |
| 0818 | Start a sequence of six 1-hour series of 100V data with Frontend Gain = 5, OG = 2, DCRC3pB intentionally railed, with 1000 beginning randoms, with no flashing in between series, and a 20ADC bin threshold trigger on DCRC3 pC. |
| 0820 | HV = 100.0 V, Vtest = 12.1 mV |
| 0824 | Trigger threshold seems higher than necessary, adjust from 20 to 18 ADC bins |
| 0833 | Trigger threshold still seems higher than necessary, adjust from 18 to 16 ADC bins |
| 0838 | Trigger threshold still seems higher than necessary, adjust from 16 to 14 ADC bins |
| 0843 | DCRC1pC is nearly railed low, adjust driver offset |
| 0845 | Trigger threshold still seems higher than necessary, adjust from 14 to 12 ADC bins |
| 1213 | Tower/MC/Coldplate = 32.9/34.5/214 mK, Still = 1.17 K / 110 μbar, G1/G2 = 191/163 mbar, 1K Pot = 1.68 K / 22 mbar. MB = 30.3%. Boil off rate: very close to slow mode. |
| 1435 | Sequence is finished. HV = 100.0 V, Vtest = 11.5 mV |
| 1455 | Finish microIbIs measurement at 100 V. Vbias values are 75-275 mV higher than yesterday afternoon at 0V |
| 1455 | Dial HV down to 0 V |
| 1500 | Flash detector for 30 s |
| 1512 | Dial HV up to 115 V for prebiasing |
| 1519 | Dial HV down to 100 V |
| 1520 | Pulses look pretty good. HV = 100.0 V, Vtest = 10.6 mV |
| 1625 | Fill LN2 cold trap bath |
| 1954 | Start a sequence of twenty 1-hour series of 100V data with Frontend Gain = 5, OG = 2, DCRC3pB intentionally railed, with 1000 beginning randoms, with no flashing in between series, and a 12ADC bin threshold trigger on DCRC3 pC. |