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| Status | Run 74 in progress. First cooldown after IVC rebuild. |
| | Tower thermometer is reading high, probably this is a thermometer problem and the actual temperature is much lower. High noise in some of the charge channels. |
| | Setup: DIB1/2+acc → SL 41/43 → 3.2 MHz filters → cables 2/3 → nothing/Source_mover_board+HV_diverter_board → DCRC50(3)/55(1). Kepco 40V supplye → HV BNC. No lead/poly shield. (actually currently DCRC55(1) is disconnected. DIB2+acc→SL43→filter→cable3→Source_mover_board) |
| 1125 | Tower/MC/Coldplate = 386/38.1/188 mK, Still = 1.33 K / 0.075 mbar / 0 mW, G1/G2= 233/209 mbar, 1K Pot = 1.63 K / 20±2 mbar. MB = 66.0% |
| 1130 | Fill LN2 cold trap bath |
| 1140 | Inspect SiHV detector S104 which was shipped to us this week. Matt Cherry wirebonded all twelve channels, some of them to charge channels. But as it turns out many of the wirebonds broke during shipment. |
| S104 in three sealed bags | S104 housing. DIBs numbered 1, 3, 4 |
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| DIB1 | DIB 3 | DIB4 |
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| Side 2 Wirebonds (this is toward-tower(crown) side) |
| DIB1 | DIB3 | DIB4 |
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| Side 1 Wirebonds (this is away-from-tower(lid) side) |
| DIB1 | DIB3 | DIB4 |
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| Side 1 full view |
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| Detector Electrical Checkout |
| DIB chan | Det chan | [Ω] |
| |
| DIB1pA | Side1pD | OL |
| DIB1pB | Side1pB | 929 |
| DIB1pC | Side2pE | OL |
| DIB1pD | Side2pD | OL |
| DIB1Q | Side1pE | 278 |
| |
| DIB3pA | Side1pF | OL |
| DIB3pB | Side2pF | 452.3 |
| DIB3pC | Side2pC | 314.6 |
| DIB3pD | Side2pB | 83.1 |
| DIB3Q | Side1pC | 374 |
| |
| DIB4pA | nc | - |
| DIB4pB | nc | - |
| DIB4pC | Side1pA | 45 |
| DIB4pD | Side2pA | OL |
| DIB4Q | nc | - |
Note: it looks like DIB3 and DIB4, as indicated by scratched numbers on the housing, are opposite to the naming convention as used previously, see e.g. Run 61 summary. Here out for this detector we're using the scratched labels.
| 1520 | Set up DCRCs to look at detector again. I disconnected the source mover board - only the HV board is connected between Cable 3 and DCRC55(1). |
| 1530 | At 10kHz noise in DCRC3qI/qO/DCRC1qI/qO = 8.0/1.2/28/12 e-6. This is q3/q1/q4/q2
At 3kHz (peak) noise in DCRC3qI/qO/DCRC1qI/qO = 114/16/38/239 e-6 |
| 1600 | Experiment with triggering and thresholds. For q4(DCRC1qI) we tried reducing the ChargeTriggerSampleLength from 12 to 6. Then saw how low we could set the threshold until it triggered into the noise: around 1500. For q1(DCRC3qO) at SampleLength 24 we could set the threshold down to 40; changed to SampleLength 6, now the lowest threshold is 60. |
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