| | Setup: DIB 1/3/4 → 3.2 MHz filters 1/2/3 → cable 1/2/3 → gender changer 1/3/4 → DCRC55(1)/33(2)/X(4) |
| 0913 | Fill LN2 cold trap full. |
| 0918 | Tower/MC/Coldplate = 27.4/30.5/188 mK, Still = 1.36 K / 0.060 mbar, G1/G2 = 145/142 mbar, 1K Pot = 1.66 K / 20 mbar. MB = 30.8% (Predicted level: 31.4%) |
| 1015 | Had to reboot jiajin. Got MIDAS running, MIDAS programs running, vnc session working, SQUID tuning gui working. |
| 1025 | As on Friday it is still the case that on DCRC4, pA and pB are unresponsive. There are no pulses, and no changes with QET bias or SQUID settings or changing polarity or ADC source. They do respond to changes in Driver Gain and Driver Offset though. |
| 1030 | Turn of MIDAS programs, turn off DCRCX(4). Unplug and replug cable. Then turn DCRC on again and restart MIDAS programs. |
| 1045 | Zap SQUIDs on DCRC4(X) |
| 1055 | pA and pB on DCRC4(X) are still unresponsive. |
| 1100 | Trying DCRC50(3) for DIB4 instead. Don't know whether DCRC50 is working, probably not. |
| 1105 | Can't even get the MIDAS programs running if I enable DCRC3. Or sometimes I can get them running but then they crash when I try to start a run. |
| 1120 | Try plugging DIB4 into DCRC1, to verify that the four channels work at all. Successful test, all four phonon channels working with DIB4→DCRC1. |
| 1145 | Plug DCRCX(4) into mini-BOB. Check voltages at QET bias sockets - they seem to respond to changing settings, e.g. on pA, 50/0/200 uA → 1.3/0/5.1 mV, similar behavior to pD. Also changing the SQUID bias changes the reading on the sockets labeled A/B/C/D or TP 7/6/10/9 (not sure what these are but I do see changes). So it seems as though some pA and pB settings are functional with DCRC4. Maybe it fails to set the polarity or ADC source correctly, not sure how to check that. Maybe by monitoring on a telnet session. |
| 1200 | Establish Telnet session with DCRC4 and try varying settings using MIDAS. For all the things I tried, it seemed to work according the reading the registers. Including polarity and ADC source settings. Hrm. |
| 1245 | Start LHe transfer (MB = 24.8%) |
| 1304 | Stop LHe transfer (MB =22.2%). Dewar was overpressurized and the transfer stick froze, need to let it warm up. |
| 1315 | Try powering all three DCRCs with same setup as this morning (except I changed the gender changer on the DIB4 cable). Looks like DCRC4 pA/pB still have the same problem. pC/pD are railed. Zap SQUIDs before checking further. |
| 1330 | Restart LHe transfer (MB = 21.2%) |
| 1417 | End LHe transfer (MB = 91.9%) |
| 1510 | Estimate event rate, count 134 pulses in 1 second = 134 Hz |
| 1600 | Erect North and South shield wall frames, but didn't start putting lead in them yet. |
| 1605 | Fill LN2 cold trap full. |