| | Setup: DIB1/3/4 → SL 27/19/20 → 3.2 MHz filters → cables 2,1,3 → HV board inputs 1,3,2 → HV board outputs 1,2 → DCRC55(1)/50(3). DCRC4 → HV power supply. |
| 1005 | Tower/MC/Coldplate = 21.4/25.0/146 mK, Still = 1.2 K / 0.100 mbar, G1/G2 = 203/175 mbar, 1K Pot = 1.61 K / 24 mbar, MB = 65.9% |
| 1010 | Fill LN2 cold trap bath |
| 1130 | Investigate floating phonon noise by looking at additional noise from breaking dcrc ground connection to fridge chassis. |
| 1148 | Start 5 min long trace randoms transition data series at HV=0V, Driver Gains = 2x, QET biases = (480/360/440)/(480/380/490) uA, Front-End Gains = 10/5 on DCRC1/3, DCRC1,3 trace length = 13.1072ms, Trigger on 20Hz randoms |
| 1154 | Stop dcrc programs, power down dcrcs 1,3. |
| 1158 | Insert switchboards on all 3 DIBs at the ebox. Switchboards have all lines connected but ground plane is broken between board and ebox. |
| | Setup: DIB1/3/4 → SL 27/19/20 → Switchboard1/3/4(broken grounds) → 3.2 MHz filters → cables 2,1,3 → HV board inputs 1,3,2 → HV board outputs 1,2 → DCRC55(1)/50(3). DCRC4 → HV power supply. |
| 1202 | Power on dcrcs 1,3 and start up dcrc programs. Still have pulses, noise doesn't seem terrible. |
| 1206 | Zap SQUIDS on DCRCs 1,3 twice, standard settings |
| 1240 | Snap and re-lock most of the channels. |
| 1245 | Tower = 21.4 mK |
| 1246 | Start 5 min long trace randoms transition data series at HV=0V, Driver Gains = 2x, QET biases = (480/360/440)/(480/380/490) uA, Front-End Gains = 10/5 on DCRC1/3, DCRC1,3 trace length = 13.1072ms, Trigger on 20Hz randoms, switchboards with broken ground planes @ ebox |
| 1329 | Stop dcrc programs, power down dcrcs 1,3, remove switchboards. |
| 1330 | Modify switchboards by bridging ground breaks with 68 uF capacitors to couple high frequency noise. Replace switchboards. |
| | Setup: DIB1/3/4 → SL 27/19/20 → Switchboard1/3/4(68 uF bridging grounds) → 3.2 MHz filters → cables 2,1,3 → HV board inputs 1,3,2 → HV board outputs 1,2 → DCRC55(1)/50(3). DCRC4 → HV power supply. |
| 1340 | Power dcrcs 1,3, start dcrc programs. |
| 1347 | Zap SQUIDS on DCRCs 1,3 twice, standard settings |
| 1350 | Snap and relock channels. All look reasonable except DCRC3pC which has crazy, jagged traces. Probably needs to be re-zapped. |
| 1400 | Tower = 23.5 mK |
| 1404 | Start 5 min long trace randoms transition data series at HV=0V, Driver Gains = 2x, QET biases = (480/360/440)/(480/380/490) uA, Front-End Gains = 10/5 on DCRC1/3, DCRC1,3 trace length = 13.1072ms, Trigger on 20Hz randoms, switchboards with 68 uF ground coupling @ ebox |
| 1411 | Stop dcrc programs, power down dcrcs 1,3 |
| 1412 | 22Na source removed from safe and placed near NaI detectors. |
| | Remove switchboards from dibs. |
| | Setup: DIB1/3/4 → SL 27/19/20 → 3.2 MHz filters → cables 2,1,3 → HV board inputs 1,3,2 → HV board outputs 1,2 → DCRC55(1)/50(3). DCRC4 → HV power supply. |
| 1410 | Power dcrcs 1,3, start dcrc programs. |
| 1416 | Zap SQUIDS on DCRCs 1,3 twice, standard settings |
| 1531 | DCRC3PC is still acting crazy even though we're back in standard mode. It's got noise present at the SQUID (preamp) which kind of looks like a modulation curve. It seems to be in phase with the test signal, though it claims the test signal is not enabled or connected to any lines. |
| 1546 | Stop dcrc programs and do a soft RESET of DCRC3. Start dcrc programs. Same noise on DCRC3PC. |
| 1556 | Actually, it seems that the DCRC3PC noise is in phase with the DCRC4 signal generator. Not sure what sort of garbage is going on here, but lets restart the lot of them. |
| 1620 | Noise still present. Turn off programs and dcrc3, restart programs. Noise still there. Restart programs and dcrcs 1,3. Reseat all cables. Noise still present. |
| 1624 | Zap SQUIDS on DCRCs 1,3 twice, standard settings |
| 1625 | Return 22Na source to safe. |
| 1637 | Noise still present on DCRC3PC. Restart with only DCRC3 powered on and enabled. Noise still there. |
| 1649 | Restart with dcrc1 only in HV2 slot on HV board (i.e. in place of dcrc3). Noise still observed on PC SQUID coil. |
| 1658 | Fill LN2 cold trap full. |
| 1659 | Recheck all cable connections. Put everything back in standard state. |
| 1716 | Noise still present on DCRC3PC and now having trouble getting DCRC3PD in transition. These are the two DIB4 channels. Maybe I killed the DIB4 squids monkeying around with the ground plane coupling? Other channels also seem to be picking up some extra 15 kHz noise now. |