2019/05/29 (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 |
|---|---|
| 0000 | Tower = 61.5 mK |
| 0815 | Tower/MC/Coldplate = 60.2/31.7/197 mK, Still = 1.25 K / 0.095 mbar, G1/G2 = 161/157 mbar, 1K Pot = 1.63 K / 22 mbar. MB = 35.3% |
| Tower temperature continues to fall linearly, slowly | |
| 0830 | Fill LN2 cold trap bath |
| DIB1/3/4 → SQUET ZC-68, ZC-13, ZC-26 | |
| Apply previous SQUID settings. For SQUET ZC-68 try Run 68 values. Here are some Run 63 SQUID settings for the other two SQUETs |
| DCRC | chan | SQUID Bias | SQUID Lockpoint | SQUET | chan |
|---|---|---|---|---|---|
| DCRCX(4) | pA | -85 | -3.6 | ZC-68 | DIB1 pA |
| DCRCX(4) | pB | -70 | -3.8 | ZC-68 | DIB1 pB |
| DCRCX(4) | pC | -85 | -3.7 | ZC-68 | DIB1 pC |
| DCRC50(3) | pB | | -4.8 | ZC-13 | DIB3 pC |
| DCRC50(3) | pC | -85 | -3.5 | ZC-26 | DIB4 pC |
| DCRC50(3) | pD | -85 | -5.7 | ZC-26 | DIB4 pD |
| 1225 | Apply above settings to ODB, apply power to DCRCs 4/3, start DAQ programs. Tower temperature rises slightly, 59.6→60.0 mK |
|---|---|
| 1230 | Zap SQUIDs on DCRCs 3,4 using DCRC Control: Tools gui. Still Pressure and Tower Temperature spike, to 63 mK / 0.175 mbar, then fall again |
| 1425 | Start pulse viewer. DCRC4 pB is actually showing pulses (QET bias = 400 uA). Others are pulseless. Adjust DCRC3pB QET bias, see pulses there too. |
| 1508 | Begin LHe transfer @ MB = 24.5% |
| 1520 | Pulses seen in all 6 channels |
| 1548 | End LHe transfer @ MB = 90.9% |
| 1640 | Chose some QET settings, generally choosing points in transition above the oscillation region. |
| 1647 | Start a background series at HV = 0V CDMS detector: Driver Gains = 1x, DCRC4/3 QET biases = (480/380/480)/(440/460/500) uA, Front-End Gains = (2/2/3)/(5/5/5) 1000 BOR randoms, trigger on DCRC4pA/B/C threshold = 6/6/6 |
| 1650 | Tower = 59.0 mK note: as with last run we suspect that the slow cooling is because the aluminum electrode takes a long time to cool to base. That means the electrode is probably warmer than the tower thermometer. But the detector is probably close to the tower thermometer temperature because in earlier runs with this detector it cooled quickly so probably has a good thermal connection. |
| 1655 | Stop data. Let's adjust offsets, then start a series. |
| 1700 | Start a sequence of 9 20-minute background series at HV = 0V CDMS detector: Driver Gains = 1x, DCRC4/3 QET biases = (480/380/480)/(440/460/500) uA, Front-End Gains = (2/2/3)/(5/5/5) 1000 BOR randoms, trigger on DCRC4pA/B/C threshold = 6/6/6 use SimpleDataLoopNoFlash.msl |
| 1740 | Fill LN2 cold trap bath |
| 1745 | MB = 90.3% |