2016/09/18 (Sunday)
| Status: LHe in bath, mixture circulating, DCRC1 and DCRC3 powered on and connected through HV setup EBoxDIB 2/3 → 3.2 MHz filters → Cables → remapping board I/remapping board II → HVside2board “DIB1”/“DIB2” → DCRC55(1)/50(3). Remapping boards have all possible lines switched off. . | |
| Baked using UV LEDs for 12 hours last night | |
| 1338 | MC(Cernox)/Tower/1K Pot = 60 mK/90 mK/1.44 K,P2 = 2.0 mbar G1/G2 = 115/1117 mbar, MB = 48.5% |
| Fill LN2 cold trap full. Tweak 1K Pot needle valve. | |
| 1342 | Noise still seen on DCRC1 Qo, with no voltage applied. Applying +4V to Qouter results in pulses similar to those posted yesterday which feature the damped harmonic effect. |
| 1358 | Return to DAQ after 15 minutes to find pulses no longer triggering. Reducing the trigger value to 3000 shows very fuzzy noise, and no pulses. Switching the Qo bias to -4V makes pulses reappear, though they are fuzzier at times. Perhaps we can only take 10-15 minutes of data at a time? |
| 1407 | Pulses are starting to breakdown. It appears that pulses were clean for 10 minutes. |
| 1458 | After some fiddling with the switchboard but not wanting to solder permanent changes on to it, we have given up. Power up the boards and start a 12 hour bake with IR. |
| 1508 | Tweak needle valve one last time. |
| 1510 | G1/G2 = 142/143 mbar, P1=0. 14 mbar, 1K Pot = 2.25 K / 1 bar (off charts) and falling, Tower temperature at 455 mK and still slowly rising due to bake. DCRCs are still powered on in HV setup. He level at 46.4%. Boiloff rate bad. Yesterday pressure was only released one time, 7 minutes after a 90.5% fill. |