2022/02/11 (Friday)
- Lab in-personnel: Matt
| Status | Run 75 in progress |
|---|---|
| Setup | Tower Faces 5/3/2 → Cables 2/1/3 → nothing/diverter_board+extra_board/nothing → Side2-readout HVboard CONN1/2/3 → HV1/2 → DCRC55(1)/50(3) Lead shield in place. Am Source y = 0.03 mm |
| Testing Side2-readout HV board | |
| 0900 | Goldman = 38.5 mK and stable. |
| 0900 | Set all QET biases based on yesterday's mini-IbIs and adjust driver offsets so baselines ~ -0.9 V. Pulses look good. |
| 0920 | Ramp HV up to 113.7V using RootSequencer. This is prebias |
| Strangely the pulses don't look very strong. What's going on? | |
| 0925 | After 5 minutes ramp HV down to 99.13 V |
| Pulses look stronger, maybe it was just breakdown noise making them look weak. | |
| 0927 | Start 99.13 V data series after 5 min 15% prebias, 41 min long, with 1000 initial randoms, no in-run randoms, trigger on DCRC3pA threshold 5. Start series with the Start Button. |
| 1010 | After stopping series dial HV down to 0.0 V using RootSequencer |
Analysis notes:
- Looking at yesterdays y=30mm data and today's y=0mm data, looking at where Am lines show up in partition space, it really looks like I've got the DCRCs swapped in the channel mapping! Very confusing - will need to stare at the HV board more.
| 1128 | Goldman/Tower/MC(H35)/Coldplate = 38.5/66.8/30.2/167 mK, Still = 1.31 K / 0.110 mbar / 0 mW, G1/G2= 267/253 mbar, 1K Pot = 1.59 K / 10±1 mbar, MB = 34.9% |
|---|---|
| 1130 | Fill LN2 cold trap bath. |
| 1437 | Begin LHe transfer @ MB = 34.6% |
| 1511 | End LHe transfer @ MB = 94.9% |
Attempting to understand the channel mapping for the Side2-readout HV board:
- Looking from the DCRC-side of the board, the cable connections are CONN1, CONN3, CONN2 left-to-right. They're labeled this way on the box, and this agrees with electrical checkouts we performed on the board.
- Connections according to the pinout spreadsheet and confirmed by checkout are as follows:
- CONN1-A/B/C/D → HV/HV/HV/CONN4-D ; CONN3-A/B/C/D → CONN5-A/CONN5-B/HV/CONN5-D ; CONN2-A/B/C/D → CONN4-A/CONN4-B/HV/HV
- But during the checkout we didn't make a note of which connectors were CONN4 and CONN5. It was obvious at the time, but we didn't mark them. (And there are no CONN-number IDs on the board.)
- Without disconnecting everything it's difficult to see much on the board. But I can see that there are leads from CONN1 that go to the right side, and I remember them going all the way over from one side to the other. That would indicate that CONN4 is the right-side DCRC connector
- So this seems to indicate that on the Side2-readout HV board, the LEFT DCRC connector is CONN5, the RIGHT DCRC connector is CONN4
- On the box the DCRC connnections are labeled “DCRC1” on the left, “DCRC2” on the right
- This is NOT what I assumed, because it seems to be the opposite convention on the Side1-readout board:
- On the Side1-readout board, CONN1-A → CONN4-A according to the pinout spreadsheet
- And this channel was connected to DCRC1, which was plugged into the connection labeled DCRC1 (which we often refer to on the wiki as “HV1”)
- So, on the Side1-readout HV board, the LEFT DCRC connector is CONN4, the RIGHT DCRC connector is CONN5
| 1705 | Reset SQUID settings on all channels to match 2-sided settings from Jan 31 according to corrected mapping. |
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