2016/10/24 (Monday)
| Setup: DIB1/3/4 → 3.2 MHz filters → cables → DCRC55(1)/33(2)/50(3) |
|
| 0830 | Return Cf source to safe. |
| 0832 | Tower/MC/Coldplate = 34.0/36.2/206 mK, Still = 1.07 K / 85 μbar, G1/G2 = 121/100 mbar, 1K Pot = 1.55 K / 4.5 mbar. MB = 36.2%. 1K pot looks to have been stable over the last 12 hours. Boiloff rate is good, slow-mode |
| 0838 | Fill LN2 cold trap full. |
| 0846 | Tweak 1K pot needle valve. |
| 0905 | Unrail all channels. |
| 0910 | Measure event rate by counting pulses above noise in DIB4pD. 41 pulses counted in 0.5 seconds (ten 50 ms traces), rate approximately 81 Hz. At this rate, about 20% of random traces would be pulse-free with 20 ms traces. About 1.5% would be pulse-free with 50 ms traces. |
| 0920 | MIDAS DAQ webpage has crashed. Attempting to restart it. |
| 0925 | Restarted DAQ using instructions Starting the MIDAS DAQ Website |
| 0925 | I think a data series was started by accident after the DAQ restarted. |
| 0930 | Check channels again, all look OK |
| 0930 | Start sequence of one-hour data series of 0V data with Frontend Gain = 5/2/5, OG = 8/3/8, with 1000 beginning and ending randoms, with no flashing in between series, and a 40ADC bin threshold trigger on DIB1 pB. (It's the 15-hour sequence but I plan to stop it early.) |
| 1255 | Commence LHe transfer (29.1%). |
| 1257 | Stop data taking, a little late. The last few minutes of the 12:30 series will probably be noisy. |
| 1333 | End LHe transfer (91.6%). |
| 1525 | Check phonon channels, all look OK. |
| 1630 | Start data series of 0V data with Frontend Gain = 5/2/5, OG = 8/3/8, with 36000 beginning randoms, with no flashing, with all trace lengths set to 20 ms. Intent is to take long-trace randoms only for noise studies. The randoms rate is 20 Hz for 30 minutes of randoms so I'll stop the data manually after 30 minutes. |
| Note: there are about 350 events per dump in this data. Dumps are 1 minute so there are actually 1200 randoms generated per dump. So only about 30% of the randoms generated are produced. Or in other words the read rate is only about 6 Hz. That's for 18 20-ms traces per event. | |
| 1635 | Let pressure out of main bath. Forgot to do it earlier. |
| 1703 | Stop data. |
| 1715 | Fill Ln2 cold trap full. |
| 1715 | 1K Pot is down to 1.55 K / 5.5 mbar. Tweak needle valve open a few more degrees. |
| 1740 | Put Cf source next to fridge for overnight activation. |