2016/02/25 (Thursday)
| Setup: iZIP mode, DIB1/2/3 → cables → 3.2 MHz filters → DCRC55/33/50 | |
| Activating detector with Cf source overnight | |
| 0920 | Tower/MC(H35)/MC sensor/Cold Plate = 31.1/27.3/42/161 mK, Still = 1.25 K / 0.085 mbar, G1/G2 = 120/105 mbar, 1K Pot = 1.51 K / 2.0 mbar, Main bath = 73.1% |
| 0920 | Remove Cf source from fridge. |
| 0925 | Tweak 1K Pot needle valve open additional 5 degrees. |
| 0930 | Fill LN2 cold trap Dewar partially… LN storage Dewar ran dry |
| 1037 | All of a sudden, we hear a loud noise coming from the pump alley. The pressure release valve on the exhaust of the He4 rotary pump is blowing out. Turn off recovery lines and switch yellow valve on He4 pump exhaust line to EXHAUST. A large and immediate release of pressure from that exhaust was enough that the pressure release valve stopped blowing. During all this, the IGH showed no sign that the 1K Pot was affected. 1K Pot temperature stayed around 1.66K, the P2 pressure stayed ~8mbar. No other pressures or temperatures seem affected. Perhaps there's an issue with overpressurizing the He recovery system. We're looking into it. |
| 1155 | Switch on only Feedback Coil and Feedback return lines for all four phonon channels (switches: 37, 21, 2, 18, 41, 25, 22, 6). Attach pi-filter board to DIB3 and power DCRC50. Zap SQUIDs. |
| 1220 | Perform mini IbIs on DIB3 with pi-filter switchboard attached and Feedback coil/return lines filtered. Unpower DCRC50. Detach pi-filter switchboard, attach DSUB filter connector, repower DCRC50. Unpower DCRC55 (DIB1), detach DSUB filter connector, attach pi-filter switchboard with all lines filtered, repower DCRC55. Zap SQUIDs. |
| 1455 | Fill LN2 cold trap full with new LN2 dewar. |
| 1700 | Finish dismantling Pb and Polyethylene shield. Oofta. |
| Fill LN2 cold trap full. | |
| 1715 | Place Cf source near detector for overnight activation. |
Spreadsheet of Mini-IbIs data