2019/03/27 (Wednesday)
| Setup | DIB1/3/4 → 3.2 MHz filters 2/3/1 → cable 3/1/2 → gender changer 3/?/2 → HVConn 1/3/2 → HV 1/2 → DCRCX(4)/DCRC50(3) DCRC33(2) → 1kV power supply → HV input Lead poly shield is erected, N/E/W walls complete, no poly or lead on S wall. DCRCs 3&4 powered down, readout cables disconnected at Ebox |
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| 1000 | Tower/MC/Coldplate = 39.4/29.2/184 mK, Still = 1.65±0.10 K / 0.150 mbar, G1/G2 = 269/254 mbar, 1K Pot = 1.78 K / 14 mbar. MB = 68.7% |
| 1015 | Fill LN2 cold trap bath |
| 1430 | Remove bias resistors connecting unused side 2 phonon lines to HV on HV board. This leaves only the DIB4 PA phonon lines connected, of which the QET and QET ret lines are connected to the contact-free electrode. The full description of the current HV board status can be found on the hv board page. |
| 1435 | Tower = 39.5 mK |
| 1440 | Plug DCRCs back into HV board. All DCRCs are off right now. Plug detector cables into HV board and into ebox. No real temp change. |
| 1445 | Power on DCRCs 2,3,4. Enable DCRCs 2,3,4 in ODB. Try to start DCRC driver, but it won't start. Can telnet to all DCRCs without issue. It finally just started up after hitting the button a few times… |
| 1450 | Tower = 41 mK and rising. |
| 1452 | MIDAS was still being weird. cdms2 is really sluggish. Restart MIDAS and dcrc programs. Tower = 46.3 mK and rising. |
| 1456 | Turn on and off 15V power on DCRCs 3,4 |
| 1458 | Tower temp = 55 mK and still rising. Stop DCRC programs and power down DCRCs 3,4. |
| 1501 | Tower temp peaks at 57.5 mK and starts to fall again. |
| 1555 | MB = 60.5% |
| 1555 | Tower = 39.6 mK, back down to this morning's temperature. |
| 1600 | Try powering DCRC4 only. First set up the ODB to enable DCRC4 & 2 only, and set DCRC4 as timing master. Power the DCRC then turn on the DAQ programs. |
| 1605 | Tower = 43.5 mK and climbing. Looks like it's rising as fast as before. Maybe it will slow down… |
| 1605 | Looking at DCRC4 phonon channels. DCRC4pA seems to not respond to QET bias changes. Try zapping SQUIDs. |
| 1610 | Tower peaked at 47.2 mK but then started falling. This happened while I was trying to get the phonon channels back in shape - don't know whether it's related. |
| 1620 | Messed around with phonon channels, after a while got all three DCRC4 channels in transition. During the process, temperature started falling more quickly. Looks like I “fixed” something. |
| 1625 | Tower = 45.0 mK and falling |
| 1625 | Reset MIDAS for DCRC3&4, power up DCRC3, restart DAQ programs. Tower temperature still falling. |
| 1625 | Zap DCRC3 SQUIDs. |
| 1650 | Got all channels into transition except DCRC3pB, which seems to be semi-unresponsive. Tower temperature falling, now 42.4 mK |
| 1657 | Fill LN2 cold trap full. |
| 1705 | DRCC3 pB mostly unresponsive. Try zapping its SQUID. |
| 1710 | Tower = 40.3 mK and falling. |
| 1715 | DCRC3 pB now responds a little bit to changing from open loop/non inv. Also small offset changes with QET bias, but no pulses. |