2020/08/16 (Sunday)
- Lab in-person: Zach
- Virtual partner: Matt
| Setup | Run 73. DIB 1/3/4 → Stripline 43/48/41 → pi-filters 1/2/3 → Cable 3/1/2 → nothing/nothing/accessory_interposer → HV_Conn 1/3/2 → HV 1/2 → DCRCX(4)/DCRC55(1)-master; DCRC33(2) → HV control. DCRCs on overnight. Lead/poly shield erected (4 lead walls, 2 poly walls). |
|---|---|
| 0830 | Tower = 50.2 mK |
| 1050 | Zach Williams body temp = 97.2 |
|---|---|
| 1110 | Zach arrives at lab. |
| 1112 | Tower/MC/Coldplate = 50.1/36.2/186 mK, Still = 1.38 K / 0.12 mbar / 0 mW, G1/G2= 386/351 mbar, 1K Pot = 1.64 K / 26±2 mbar. |
| 1032 | MB = 30.6% |
| 1120 | Disconnected and reconnected DCRC1 (as well as programs) and zapped. |
| 1130 | Check phonon channels, adjust offsets. DCRC1pB no longer has an abnormal offset, that's a good sign. |
| 1129 | Start a 15 min series 0V, CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = (0,320,370,0)/(0,360,420,420)uA, Front-End Gains = (3/3/3)/(5/5/5) 1000 BOR & 5 Hz in-run randoms, trigger on DCRC1pD threshold = 8 Use sequence SimpleDataLoopNoFlash.msl |
| 1130 | Tower = 50.5 mK |
| this temperature is a little lower than we've taken data before, and DCRC1pD may have more oscillations than usual, maybe triggering too much, but looks OK so far with BatViewer. | |
| 1131 | Oops: did not have the triggering enabled, turn it on now |
| 1135 | Tower = 50.1 mK, it has cooled a little since the zap |
| 1137 | Lowering transfer line stinger into cryostat, this will probably show up as noise in the data |
 |  |
| The DCRC restart seems to have fixed the high-energy gain suppression. Gain is a little higher with today's data, probably from the lower temperature. |
|
| 1141 | Begin LHe transfer @ MB = 30.3% |
|---|---|
| 1154 | Filled LN2 cold trap dewar. |
| 1215 | Ended LHe transfer @ MB = 93.2% |
| 1230 | Write sequence for +100V at 33.2 mV/s with 1min pause after rampup. HVdrift_pos100V_1min_33p2mVps_multiloop10_60min.msl |
| 1236 | MB = 93.0% |
| 1237 | Zach leaves lab. |
| 1300 | Zach Williams body temp = 97.1 |
| 1325 | Tower = 54.8 mK. Set QET biases to middle-column values |
| 1333 | Start a 60 min series at HV = +100V, drifting 0.0332 V/s, 1min pause after rampup, CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = (0,310,360,0)/(0,360,410,410)uA, Front-End Gains = (3/3/3)/(5/5/5) 1000 BOR & 5 Hz in-run randoms, trigger on DCRC1pD threshold = 8 Use sequence HVdrift_pos100V_1min_33p2mVps_multiloop10_60min.msl |
| 1330 | Tower = 54.8 mK |
| 1334 | Vtest = 5.7 mV shortly after drift begins. Drift appears to start at +101.1 V. 2.3% HV loss. |
| 1440 | Vtest = 9.4 mV, HV = 219.6 V, drift ends. 1.7% HV loss, good. Lag ratio = 1.1ish. |
| 1440 | Tower = 55.2 mK. |
- It's hard to see anything in this data - it looks like the threshold was too low, it was triggering constantly.
| 2150 | Noise was looking kinda bad in DCRC1pD. Tried Zapping the SQUIDs, seems like maybe it's better. Doesn't seem to be triggering excessively at the standard threshold of 8. |
|---|---|
| 2150 | Tower = 55.4 mK |
| not sure, channel still seems to have spikey noise. I'll look at it more tomorrow. |
 |
| The new spikey noise is evident in the much higher PFWKmax seen in randoms we need to check if this is unique to +100V but I don't think so |