Table of Contents
2017/06/20 (Tuesday)
| Status | Tower removed from fridge. Mixture has been cryocleaned 3 times. Fridge is evacuated but should probably be pumped out again. 1K Pot needle valve is open, so now there will be air in the pot, should pump it out before cooling. Cryostat vacuum jacket has been pumped down to 190 ubar, maybe should be pumped out more before cooling. |
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| 0830 | Lab = 22.7 C, 42% humidity. |
To do:
- Open S101 housing and look at “bad” channels. We seem to have exhausted all possible wiring problems, see if there are any hints that the channels are not continuous on the detector.
- Repair side coaxes using wirebonder
- Electrical checkout for charge channels on 1) SQUETs 2) striplines
Run 62:
| 1525 | Remove S101 from purge to look at the bad channels |
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| 1550 | Put S101 back in purge |
| S101 Side 2. In each photo, UMN DIB1 is at the bottom. | |||
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Run 63:
| 0845 | Bring side coaxes to wirebonder lab. Wirebonder settings for Cu strip - to - pad on resistor: power 480/450, time 30/30, bond height 50, drop before clamp 10 |
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| 0910 | Repair ST-3-9 |
| 0930 | Partially repair ST-3-10 |
| 1150 | Electrical check on ST-3-9 - it isn't fixed. Same readings as yesterday. |
| 1155 | Electrical check on ST-3-10 - it isn't fixed either. Same readings as yesterday. |
| 1245 | Back in wirebonder lab, fix another loose bond on ST-3-9. Electrical check should shows it's working. |
| 1310 | Rewirebond ST-3-10 qI Rbias - seems to be working. |
| 1330 | Rewirebond ST-3-10 qO Rbias - seems to be working. |
| 1345 | Rewirebond ST-3-3 qI Rfeedback - seems to be working. |
| 1405 | Rewirebond ST-3-3 qO Rfeedback - seems to be working. |
| Side coax | ST-3-3 | |||
|---|---|---|---|---|
| date: | 2015-06-20 | who: | NM GR | |
| +lead | - lead | signal | typical | measured |
| D11 | T11 | Qo Rbias | 25 nS | 25.6 nS |
| T12 | T13 | Qo Rfeedback | 25 nS | 25.6 nS |
| D11 | T12 | Qo C coupling | <1 nS | 0.35 nS |
| D12 | T14 | Qi Rbias | 25 nS | 25.6 nS |
| T15 | T16 | Qi Rfeedback | 25 nS | 25.7 nS |
| D12 | T15 | Qi C coupling | <1 nS | 0.3 nS |
| Side coax | ST-3-10 | |||
|---|---|---|---|---|
| date: | 2015-06-20 | who: | NM GR | |
| +lead | - lead | signal | typical | measured |
| D11 | T11 | Qo Rbias | 25 nS | 26.8 nS |
| T12 | T13 | Qo Rfeedback | 25 nS | 26.3 nS |
| D11 | T12 | Qo C coupling | <1 nS | 0.4 nS |
| D12 | T14 | Qi Rbias | 25 nS | 24.6 nS |
| T15 | T16 | Qi Rfeedback | 25 nS | 26.4 nS |
| D12 | T15 | Qi C coupling | <1 nS | 0.2 nS |
| Side coax | ST-3-9 | |||
|---|---|---|---|---|
| date: | 2015-06-20 | who: | NM GR | |
| +lead | - lead | signal | typical | measured |
| D11 | T11 | Qo Rbias | 25 nS | 25.2 nS |
| T12 | T13 | Qo Rfeedback | 25 nS | 25.4 nS |
| D11 | T12 | Qo C coupling | <1 nS | 0.2 nS |
| D12 | T14 | Qi Rbias | 25 nS | 25.2 nS |
| T15 | T16 | Qi Rfeedback | 25 nS | 25.3 nS |
| D12 | T15 | Qi C coupling | <1 nS | 0.1 nS |
| ZC13 | ||||
|---|---|---|---|---|
| date: | 2015-06-20 | who: | NM GR | |
| FET Heater + to - | SL34-SL35 | 1.01 kΩ | ||
| FET tsense- to heater- | SL37-SL35 | 441 kΩ | ||
| Qi | Qo | |||
| Bias | Tow14-SL24 | 0.5 Ω | Tow11-SL21 | 0.5 Ω |
| Gate to Source | Tow15-SL36 | 549 kΩ | Tow12-SL33 | 549 kΩ |
| Gate to Drain | Tow15-SL25 | 549 kΩ | Tow12-SL22 | 549 kΩ |
| Feedback | Tow16-SL38 | 0.5 Ω | Tow13-SL23 | 0.4 Ω |
| ZC26 | ||||
|---|---|---|---|---|
| date: | 2015-06-20 | who: | NM GR | |
| FET Heater + to - | SL34-SL35 | 1.01 kΩ | ||
| FET tsense- to heater- | SL37-SL35 | 450.9 kΩ | ||
| Qi | Qo | |||
| Bias | Tow14-SL24 | 0.3 Ω | Tow11-SL21 | 0.4 Ω |
| Gate to Source | Tow15-SL36 | 549 kΩ | Tow12-SL33 | 510 kΩ |
| Gate to Drain | Tow15-SL25 | 549 kΩ | Tow12-SL22 | 510 kΩ |
| Feedback | Tow16-SL38 | 0.4 Ω | Tow13-SL23 | 0.4 Ω |
| ZC39 | ||||
|---|---|---|---|---|
| date: | 2015-06-20 | who: | NM GR | |
| FET Heater + to - | SL34-SL35 | 1.01 kΩ | ||
| FET tsense- to heater- | SL37-SL35 | 450 kΩ | ||
| Qi | Qo | |||
| Bias | Tow14-SL24 | 0.4 Ω | Tow11-SL21 | 0.3 Ω |
| Gate to Source | Tow15-SL36 | 545 kΩ | Tow12-SL33 | 552 kΩ |
| Gate to Drain | Tow15-SL25 | 545 kΩ | Tow12-SL22 | 552 kΩ |
| Feedback | Tow16-SL38 | 0.5 Ω | Tow13-SL23 | 0.4 Ω |
| 1505 | Remove Soudan tower from purge cabinet |
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| Soudan Tower | ||||||
|---|---|---|---|---|---|---|
| date: | 2015-06-20 | who: | NM GR | |||
| Face | 1 | 2 | 3 | 4 | 5 | 6 |
| Channels | All around 30 Ω | ~30Ω | ~30Ω | ~30Ω | ~30Ω | ~30Ω |
Checked that each channel was continuous and not grounded to chassis.
| 1520 | Remove Am source from 150 mm electrode and put on bottom shelf of cabinet above (not clean bench). Visual inspection shows that the kapton tape came loose, but otherwise nothing troubling. Did not inspect the crystal itself. |
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| Pb source holder |
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| We want to use a particular Am source holder this run so that the others can be modified for the 150mm setup. But if we use the Pb holder as is, we need the small Am holder with the offset collimator. Or we could drill a new hole in the plate centered between the screw holes. Need to assess in either case whether the source position would be too close to the outer rim. |