2018/03/29 (Thursday)
| Setup: DIB1/2 → SL 43/41 → 3.2 MHz filters → cables 3/1 → DCRC50(3)/55(1). | |
| 0352 | Stop data. Set biases to 0 V. Turn on LEDs to start a bake. |
| 0806 | Turn off LEDs to end bake (4 hr 14 min) |
| 0905 | Tower/MC/Coldplate = 36.6/32.2/194 mK, Still = 1.51 K / 0.13 mbar, G1/G2 = 185/170 mbar, 1K Pot = 1.64 K / 30 mbar. Main bath = 35.6% |
| plan: take a series around 8 V for a while. Then standard flash, then another identical series. Want to verify that standard flash is just as good as long bake. | |
| 0917 | Start 63 min series , with DCRC bias = 8 V, 1000 beginning randoms, and a 60/50/70/50 bin threshold trigger on DCRC1qI/qO/DCRC3qI/qO, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). Good triggering |
| 0925 | Don't know whether triggering is good on this data, because the copy script seems to be hanging - the data is not getting copied to /midasraw/byseries. The file /livedata/lazy_log_update.log has this line: |
09:19:32.253 2018/03/29 [Lazy_0,INFO] Starting lazy job '/home/hep/cdmssoft/scdmsDAQ/MidasDAQ/online/scripts/lazylog/copy_rawdata.py /data/chocula/k100/midasraw/livedata/RUN28432_DUMP0000.mid.gz 2>&1'
| so it seems that it's stuck. Data is coming in to /livedata but it's not being copied. | |
| The Stat1 light on DCRC1 is flickering occasionally, but on DCRC3 the brightness is constant. So could be we are triggering constantly. | |
| 1021 | Fill LN2 cold trap full. |
| 1022 | Stop run, ground detector |
| 1025 | Flash for 30 s |
| 1027 | Restart MIDAS. Lazylogger starts copying over all the dumps from previous run. |
| Turns out this morning's series had good triggering. | |
| 1056 | Start 120 min series , with DCRC bias = 8 V, 1000 beginning randoms, and a 60/50/70/50 bin threshold trigger on DCRC1qI/qO/DCRC3qI/qO, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). Good triggering |
| 1301 | Stop data, set biases to 0V, flash detector for 30 seconds |
| 1305 | Start LHe transfer (MB = 29.5%) |
| 1355 | Set biases to 6 V plan is to look at event rate, then bring out the Ba source |
| 1358 | End LHe transfer (MB = 92.8%) |
| 1424 | Ground and flash detector. |
| 1506 | Place 133Ba source in lead castle near fridge. Source is about 8 cm from the mu-metal and 13 cm lower than the detector height. |
| 1507 | Start 45 min Ba series , with DCRC bias = 8 V, 1000 beginning randoms, and a 60/50/70/50 bin threshold trigger on DCRC1qI/qO/DCRC3qI/qO, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). Good triggering. |
| 1530 | The 1K Pot has been falling since the LHe transfer. 1K Pot = 1.54 K / 11 mbar. |
| 1530 | Tweak 1K Pot needle valve open a few more degrees. 1K Pot → 1.60 K / 24 mbar |
| 1552 | Stop data, set biases to 0V, flash for 30 s |
| 1630 | Fill LN2 cold trap full. |
| 1632 | Start Sequence of 8 45 min Ba series using flashandtake_R67.msl, with DCRC bias = 8 V, with 30s flash, 15min cooldown, 1000 beginning randoms, and a 60/50/70/50 bin threshold trigger on DCRC1qI/qO/DCRC3qI/qO, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). Good triggering |
| 1641 | 1K Pot has fallen again to = 1.53 K / 9.5 mbar. Tweak needle valve again. 1K Pot → 1.61 K / 26 mbar |
| 1700 | Looks like the 1K Pot is falling in about the same way, so I'll tweak it once more. 1K Pot: 1.59 K / 20 mbar → 1.63 K / 32 mbar |