2015/07/06 (Monday)
| overnight status: Cf source near detector, baking detector. DIB1/2/3 → no filter/100 MHz C filter/3.2 MHz pi filter → DCRC55/33/50 | |
| 0840 | Tower = 298 mK, Still = 2 mW / 0.13 mbar, G1/G2 = 260/250 mbar, 1K Pot = 1.69 K / 13 mbar, Main bath = 72.1% |
| 0841 | Turn off flashing |
| 0845 | Fill LN cold trap Dewar |
| 0955 | DCRCs running, QETs at standard settings. Set new thresholds: |
| Current phonon threshold settings | ||||
|---|---|---|---|---|
| pA | pB | pC | pD | |
| DIB1 | 25 | 25 | 30 | 20 |
| DIB2 | 30 | 20 | 30 | 25 |
| DIB3 | 25 | 15 | 10 | 25 |
| Problems with B1 losing lock, requiring relock. Change B1 driver offset from -0.094 V to -0.08 V | |
| note | Oscillation seen in phonon channels ~175 Hz, 10/10/6 mVpp on DIB1/2/3. |
| 1014 | Set -4/+4 V. Start data, DIB3pB shifted: adjust driver offset from -0.012 to -0.098 V, stop data |
| 1018 | Start bkg data |
| 1033 | DAQ is sluggish, 100% CPU - stop run |
| 1041 | Thresholds still look fine, not too low. Test run with 100 randoms, CPU seems fine. |
| 1046 | Set 0/0 V, flash 30 seconds. |
| 1058 | Relock DIB1pB, apply -4/+4 V, start bkg data. Data taking runs fine. |
| 1115 | Stop data |
| 1130 | Scroll pump has been very loud. Prepare to stop using scroll pump as pot pump and try using the actual TRIVAC pot pump |
- open V9 to allow mix to expand into dump
- close 1K Pot needle valve, close 1K Pot speedivalve, close V4a, close valve at pump-end of bellows
- switch off scroll pump, attach bellows to TRIVAC pot pump, start pot pump
- reopen pot valves in reverse order
- close V9, open V14 to allow mix back into dump
| 1148 | V14 closed, all mix back in circulation. Base stayed pretty low during the switchover until opening V14, rose to over 100 mK. Adjusting 1K Pot needle valve to approximate previous pressure and temperature. |
|---|---|
| 1240 | Tower back to base of about 31 mK. Somewhat oscillatory, +/- 0.2 mK. Try doubling still power to 4 mW. |
| 1345 | Set to 0/0 V, flash long enough to hit stable temperature around 290 mK (about 3 minutes) |
| 1455 | Set -4/+4 V. Start bkg data |
| 1514 | Stop data, set 0/0 V, flash 30 seconds |
| 1527 | Set -4/+4 V. Start bkg data |
| 1544 | Stop data, set 0/0 V, flash 30 seconds. |
| 1601 | DIB1pB lost lock, relock |
| 1602 | Set -4/+4 (?) V. Start bkg data |
| 1621 | Stop data, set 0/0 V, flash 30 seconds. Note: DIB1 qI&qO had accidentally been set to -7 V at some unknown time |
| 1623 | Temperature is somewhat oscillatory with TRIVAC pot pump, try 5 mW still heat |
| 1644 | Still = 0.19 mbar, Tower 31.5 mK with ~0.2 mK oscillations. Try still heater at 0 mW |
| 1650 | Set -4/+4 V. Start bkg data |
| 1707 | Stop data, set 0/0 V, flash 30 seconds. |
| 1735 | Set -4/+4 V. Start bkg data. End with 30 second flash. |
| 1742 | Fill LN2 cold trap full. |
| 1817 | Set -4/+4 V. Start bkg data. Relock DIB1pB. End with 30 second flash. |
| 1858 | Set -4/+4 V. Start bkg data. Relock DIB1pB. End with 30 second flash. |
| 1944 | Set -4/+4 V. Start bkg data. Relock DIB1pB. End with 30 second flash. |
| 2000 | Start overnight bake. |
| 2005 | Tower at 295 mK. Put Cf source on fridge for overnight activation. |