2016/12/07 (Wednesday)
| 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) | |
| Taking overnight data at HV=30 V. Data looks good except that DCRC1pC railed 17 minutes into the first dump, 1206_1713. | |
| 0745 | Main bath = 35.6% |
| 0755 | HV = 30V, Vtest = 1.0 mV. So Vdetector = 29.6 V |
| 0820 | Unrail DCRC1pC |
| 0840 | Perform microIbIs on all 5 available channels. Compared with yesterday's 0V measurements, all Vbias values seem to be elevated between 40 and 100 mV, average 77 mV (driver gain 2x). This could be due to parasitic power, but could also be due to the relative difficulty in finding the baseline when the pulses are so strong. |
| 0845 | Dial HV back down to 0 V |
| 0905 | Perform another microIbIs. This time in general the Vbias values are lower, close to yesterday's 0V measurements. All are within 8 mV, some above some below, except DCRC1pA is an outlier - seems to have shifted after remeasurement too, not sure what's up with that one. |
| Not enough 0-volt data was taken yesterday to get a peak, so let's take some more. (Maybe a hint of a peak in Side1pF.) | |
| 0925 | Restore driver gains to 8x and adjust driver offsets. |
| 0928 | Start a sequence 1-hour series of 0V data with Frontend Gain = 5, OG = 8, DCRC3pB intentionally railed, with 1000 beginning randoms, with no flashing in between series, and a 45ADC bin threshold trigger on DCRC3 pD. Aborted, no data written |
| 0934 | The data doesn't seem to be writing to disk. This happened to me last Thursday. Abort this sequence. |
| 0936 | Start a series of 0V data with the Start Run button with Frontend Gain = 5, OG = 8, DCRC3pB intentionally railed, with 1000 beginning randoms, with no flashing in between series, and a 45ADC bin threshold trigger on DCRC3 pD. Stop after 3 minutes. |
| 0940 | This series seems to be writing to disk. But apparently two channels on DCRC1 are railed. |
| 0945 | Adjust driver offsets |
| 0946 | Start a sequence 1-hour series of 0V data with Frontend Gain = 5, OG = 8, DCRC3pB intentionally railed, with 1000 beginning randoms, with no flashing in between series, and a 45ADC bin threshold trigger on DCRC3 pD. Aborted. |
| 0950 | Checking with BatViewer it looks like the threshold is too low, less than 1/10 triggers are pulses. |
| 0952 | Start a sequence 1-hour series of 0V data with Frontend Gain = 5, OG = 8, DCRC3pB intentionally railed, with 1000 beginning randoms, with no flashing in between series, and a 50ADC bin threshold trigger on DCRC3 pD. Aborted. |
| 0957 | Start a sequence 1-hour series of 0V data with Frontend Gain = 5, OG = 8, DCRC3pB intentionally railed, with 1000 beginning randoms, with no flashing in between series, and a 55ADC bin threshold trigger on DCRC3 pD. |
| 1010 | Tower/MC/Coldplate = 33.2/36.1/226 mK, Still = 1.2 K / 110 μbar, G1/G2 = 191/176 mbar, 1K Pot = 1.68 K / 24 mbar. MB = 32.0%. Boil off rate: a bit slower than slow mode! |
| 1147 | Stop data because I noticed that DCRC1pB is railed. The channel railed 25 minutes into the _1057 series, Event#252241. Unrail DCRC1pB and also tweak trigger threshold a little higher, probably more noise triggers than we want. |
| 1150 | Start a sequence 1-hour series of 0V data with Frontend Gain = 5, OG = 8, DCRC3pB intentionally railed, with 1000 beginning randoms, with no flashing in between series, and a 60ADC bin threshold trigger on DCRC3 pD. Aborted because threshold still seems too low |
| 1156 | Start a sequence 1-hour series of 0V data with Frontend Gain = 5, OG = 8, DCRC3pB intentionally railed, with 1000 beginning randoms, with no flashing in between series, and a 65ADC bin threshold trigger on DCRC3 pD. |
| 1307 | Stop data to take bias data. |
| 1309 | Flash detector for 30s. |
| 1312 | Prebias detector to 35V for ~5mins, then turn back down to 30V. |
| 1330 | Leakage current test voltage=1.1mV |
| 1333 | Start a sequence 1-hour series of 30V data with Frontend Gain = 5, OG = 4, DCRC3pB intentionally railed, with 1000 beginning randoms, with no flashing in between series, and a 35ADC bin threshold trigger on DCRC3 pD. |
| 1430 | Stop data |
| 1434 | Commence LHe transfer (24.5%) |
| 1517 | Flash detector for 30s. Oops, it was still biased. Turn the bias down and wait for it to cool before flashing again. |
| 1535 | Ground and flash detector for 30s |
| 1531 | Cease LHe transfer (92.9%) |
| 1538 | Release MB pressure. |
| 1539 | Prebias detector to 17.5V for 5 mins, then reduce to 15V. |
| 1548 | Recovered a few railed channels. |
| 1551 | Start a sequence 1-hour series of 15V data with Frontend Gain = 5, OG = 4, DCRC3pB intentionally railed, with 1000 beginning randoms, with no flashing in between series, and a 35ADC bin threshold trigger on DCRC3 pD. |
| between 30 and 40 minutes into the first series (_1550), DCRC3pC railed. By the beginning of the second series (_1650), DCRC1pB, DCRC1pC, DCRC3pC were all railed. | |
| 1624 | Release pressure from main bath. |
| 1635 | Fill LN2 coldtrap full. |