| 0849 | Fill LN cold trap Dewar |
| 0920 | Currently there is an oscillation in the phonon channels (seen in DIB2 but likely present in the others too), low frequency: period is about 5 ms (so it's more clearly seen with the pulse window set to 20 ms). It is varying in amplitude and there are spikes in Tower temperature every few minutes, between around 2 and 20 mK. |
| 0922 | MC/Tower = 26.3/33 mK, Cold plate = 146 mK, Still = 1.11 K / 0.080 mbar, G1/G2 = 175/165 mbar, 1K Pot = 1.70 K / 18 mbar, Main bath = 14.5%. |
| 0934 | Problem with low-frequency oscillation seen in all phonon channels. Period is about 5 ms, about 40/20 mVpp in DIB1/2 with both gains set to 1. Also there are tower temperature spikes every few minutes around 2-20 mK high. |
| | overnight temperature was stable, until starting at 6:10 temperature spikes were seen at 20 minute intervals repeating four times (last at 7:20), each a little stronger than the last, from about 1 mK to 5 mK in height. Then stable till about 8:30 when Anthony came in and began doing stuff with DCRCs. |
| 0938 | DIB1 Qouter also shows a lowish amplitude oscillation, period around 1 ms. |
| 0939 | attempted power cycling each DCRC one at a time, did not remove oscillation. |
| 0950 | Turning off DIB1 FETs seems related - at one point leaving them off for a while seemed to make oscillation go away. But as we sometimes saw in the previous run, turning off the FETs with DCRC31 often caused the temperature to increase. |
| 1123 | Disconnected power to all DCRCs. Strangely there were additional temperature spikes: |
| 1136 | Tower spiked to 63 mK |
| 1145 | MC spike from 28 to 38 mK |
| 1156 | Tower spike from 33 to 75 mK, MC spike from 27 to 38 mK, MC spike seems delayed rel. to Tower. Some heat coming from Tower for some reason…? |
| 1227 | No more temperature spikes. MC/Tower = 25/32 mK. Still pressure is rather low, around 0.075 mbar, so try apply 2 mW to still. Still P increases to 0.100 mbar, MC stabilizes a little colder, 24 mK. |
| 1334 | MC/Tower stable at 24/31 mK (even lower base for tower!). |
| 1411 | Commence LHe transfer (5.0%). |
| 1446 | Cease LHe transfer (64.3%). |
| 1655 | Commence retaking SQUID lockpoint sweep data taking after a 20 minutes flash and 2 hour cooldown: 7 data series each of length 10 minutes, taken at -/+4.0 V bias, interspersed by 6-second flash and 20-minute cooldown periods. OR trigger on phonon channels each with a threshold of 50 ADC Bins. Front End Gain of 7, Output Gain of 1. Squid Lockpoints used included in table below: |