2021/12/15 (Wednesday)
- Lab in-personnel: Matt
| Status | Run 75 in progress |
|---|---|
| Setup | Tower Faces 5/3/2 → Cables 2/1/3 → nothing/diverter_board/nothing → DCRC55(1)/DCRC50(3)/DCRCx(4) |
| 1050 | Goldman/Tower/MC/Coldplate = 50.3/111/36.7/221 mK, Still = 1.70±0.04 K / 0.130 mbar / 0 mW, G1/G2= 175/182 mbar, 1K Pot = 1.64 K / 26±2 mbar. MB = 33.4% |
| Coldplate and Still thermometers are still reading high, still thermometer reading not very stable. | |
| 1100 | Fill LN2 cold trap bath. |
| 1145 | Got yesterday's DCRC4pA IbIs to process (the code had a dumb bug that only allowed “detector” numbers up to 3). |
| Still need to move yesterday's DCRC4pB IbIs files to new directory | |
| 1155 | Make new directory in /byseries and move the QB_scan files from /livedata to the new directory. |
| 1200 | Adjust DCRC4pC driver offset so that IbIs peak (QET bias around 340) is near top of output scale (around 1V). |
| 1201 | Start automated IbIs on DCRC4pC. 500 to 200 uA step -2. |
| 1245 | Make new directory in /byseries and move the QB_scan files from /livedata to the new directory. |
| 1245 | Noticed that temperature (Goldman thermometer) increased from 50.2 to 50.5 mK starting at 12:30. Took a look at DCRC4 channels - pC was railed, relocked it, looked like it may be in s/c, upped the QET bias from 300 to 350 to see pulses again. After that temperature started falling again. |
| 1300 | Adjust DCRC4pD driver offset so that IbIs peak (QET bias around 210) is near top of output scale (around 1V). |
| 1306 | Start automated IbIs on DCRC4pD. 400 to 100 uA step -2. MIDAS got stuck, this only got down to 146 uA (see below) |
| 1340 | Looks like MIDAS got stuck. Browser interface isn't responding. Data files were showing up a few per minute until 13:33, then they stopped. |
| 1345 | Kill then restart MIDAS. Restart DAQ programs. Sequencer appears to be stuck - stuck on Transition Start line, “Cannot start run” error message. Not sure how to get out, the Stop Immediately button isn't there… Clicking “Load sequence” brings up the ordinary page. I guess the sequence terminated itself. Need to start over I guess. \\… although sequence got down to 144 uA, that may be enough. |
| 1350 | MIDAS is in some odd state - can't start data… wait I fixed this by turning off the logger. |
| may need to re-run the sequence just to get the proper stuff reset. | |
| 1400 | Make new directory in /byseries and move the QB_scan files from /livedata to the new directory. |
| 1505 | Run a short IbIs sequence just to let the sequencer perform all the reset steps at the end. Delete the data files. |
| 1515 | Begin LHe transfer @ MB = 26.4% |
| 1551 | End LHe transfer @ MB = 90.4% |