2018/03/23 (Friday)
| Setup: DIB1/2 → SL 43/41 → 3.2 MHz filters → cables 3/1 → DCRC50(3)/55(1). | |
| Overnight bias-sweep data. Last flash occurred at 5:08. Tower rises to 390 mK during flash. | |
| 0925 | Tower/MC/Coldplate = 40.3/31.9/187 mK, Still = 1.46 K / 0.120 mbar, G1/G2 = 137/120 mbar, 1K Pot = 1.63 K / 28 mbar. Main bath = 66.3% |
| 1K Pot is running lower than before but it was very stable overnight, we'll leave it for now. | |
| 0935 | Fill LN2 cold trap bath |
| 1309 | Flash for 30s using flashandflash tool. |
| 1311 | Start 5min series of 5V data (DCRC bias), |
| 1312 | Tower = 78.8 mK |
| 1315 | Stop Series Triggerfe was set to 20Hz randoms with no BOR randoms |
| 1314 | Start 1hr 50min series of 5V data (DCRC bias), with 1000 beginning randoms, and a 80/80/100/80 bin threshold trigger on DCRC1qI/qO/DCRC3qI/qO, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). |
| 1317 | Tower = 49.1 mK |
| 1324 | Tower = 43.3 mK |
| 1345 | Tower = 40.4 mK |
| 1415 | Tower = 40.0 mK |
| 1416 | Apply 1 μW power to MC. Tower temperature increasing. |
| 1419 | Tower = 47.2 mK. Peaks there, falls to 46.2, oscillating a bit in that region. |
| 1423 | Tower peaked at 47.8 mK, then settled down to 45.4 mK |
| 1426 | Tower falls again, to 44.5 mK, then rises to 44.7, then falls. |
| 1430 | Tower = 43.3 mK Turn off MC heater. Tower falls below 43 mK, settling slowly to base. |
| 1502 | MIDAS crashed, possibly a problem with the network - there were some issues with various computers in the Linux network. 1502 was the time of the last dump… |
|---|---|
| 1605 | Restart MIDAS. |
| 1611 | Restart DAQ programs. |
| 1625 | Looking at low-frequency noise on DCRC3 particularly qI. It comes and goes on a scale of 10s of seconds. Try a soft RESET of DCRC3. Doesn't help. |
| 1630 | Try hard powercycle of DCRC3. Doesn't help. |
| 1630 | Try swapping the DCRCs, so DIB1/2 → DCRC55(1)/50(3) instead of the other way around. The low-frequency noise followed the DIB, not the DCRC. |
| 1640 | Change back to the standard setup, DIB1/2 → DCRC50(3)/55(1) |
| 1655 | Set bias to +5V and experiment with trigger thresholds. Looks like we can get away with DCRC1qI/qO/DCRC3qI/qO = 50/40/60/40 |
| 1707 | Fill LN2 cold trap full. |
| 1710 | Start bias scan sequence of 30 min series , with DCRC bias = (2,4,6,8,10,12,-2,-4,-6,-8,-10,-12), with 30s flash, 30min cooldown, 1000 beginning randoms, and a 50/40/60/40 bin threshold trigger on DCRC1qI/qO/DCRC3qI/qO, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). |