2017/04/19 (Wednesday)
| Setup: DIB1/3/4 → 3.2 MHz filters 3/1/2 → cable 3/1/2 → gender changer 3/1/2 → DCRC55(1)/33(2)/X(4) | |
| 0930 | Fill LN2 cold trap full. |
| 1010 | Tower/MC/Coldplate = 34.1/31.5/199 mK, Still = 1.4 K / 0.120 mbar, G1/G2 = 260/237 mbar, 1K Pot = 1.697 K / 30 mbar. Main Bath = 31.6%. Boil off rate: faster than slow mode (predicted level: 35.1%) |
| 1035 | Installing NaI detectors on south shield wall. Isolate IVC from turbo pump, turn off turbo pump in preparation to move it. |
| 1040 | Power down DCRCs |
| 1100 | Modify HV board to bridge ground planes spanned by “crossover” channel, S1PA. |
| 1140 | Start LHe transfer (MB = 29.6%) |
| 1146 | Set up HV mode Setup: DIB1/3/4 → 3.2 MHz filters 3/1/2 → cable 3/1/2 →gender changer 3/1/2 → HVConn 1/3/2 → HV 1/2 → DCRC55/DCRC33 |
| 1156 | Power DCRCs 55,33 |
| 1206 | Restore DCRC1,2 phonon HV settings by inputting those present in the last saved HV .odb file (livedata/run06056.odb) |
| 1209 | Zap SQUIDs |
| 1240 | End LHe transfer (MB = 91.9%) |
| 1334 | Pulses seen on all 6 channels, DCRC2 PB looks a little noisy, but can definitely see pulses on it now! |
| 1425 | Finish IbIs on DCRC2pB |
| 1530 | Attach south shield frame with NaI detectors attached. |
| 1622 | Re-attach turbo pump manifold to IVC line. Rough pump on pump manifold and start up turbo pump while isolated. |
| 1704 | Rough pump turbo manifold and line up to IVC manual valves which are still closed. Begin turbo pumping on line up to IVC manual valves. Let's leave this pumping over night with IVC isolated. |
| 1717 | Prebias HV = 65 V. |
| 1715 | From April 11 it seems that the current QET biases give Ib*prefactor=40. This may be too high, but for now, set DCRC2pB's to be similar for consistency's sake. Based on IbIs, DCRC2pB should have QET bias = -121.17 uA to achieve Ib*pf = 40 |
| 1725 | Reduce HV to 50V |
| 1727 | Start sequence of |
| 1730 | HV = 49.99 V, V_leak = 2.8 mV, V_crystal = 48.76 V |
| 1737 | Turbo pressure is 4.0e-6 mbar |
| 1740 | Fill LN2 cold trap full |
| 1743 | Stop the run prematurely, DCRC1pC has some HF noise at the top of pulses, DCRC2PB and DCRC2pC are railed. |
| 1747 | Reduce DCRC1pC FE gain to 5. This helps a little bit. Probably it needs to be zapped though. Adjust other channel driver offsets. |
| 1751 | Start sequence of 12, 1-hour data series of 1-sided 50V data with Frontend Gain = (20/20/10/-)/(-/3/4/2), OG = 4/2, QET biases = described above at 1715, with 1000 beginning randoms, no flashing, and a 17ADC bin threshold trigger on DCRC1 pA |
