2016/08/14 (Sunday)
| Setup: iZIP mode, DIB1/2/3 → 3.2 MHz filters → cables → DCRC55(1)/33(2)/50(3), Tower has been cooled below Al transition with mu-metal shield at standard position | |
| DCRCs powered overnight. Tower temperature was stable at ~40mK. Pumping on IVC with turbo pump overnight. | |
| Some channels railed in yesterday's data, should redo. | |
| 1137 | Tower/MC/Coldplate = 40.5/38.1/156 mK, Still = 1.31 K / 60 μbar, G1/G2 = 201/182 mbar, 1K Pot = 1.51 K / 5.0 mbar, MB = 53.6%. Boiloff rate is bad. Pressure was released at 5 and 30 minutes after the fill yesterday, apparently this didn't work. |
| Fill LN2 cold trap full. | |
| 2020 | Tower = 41.8 mK, Still = 60 μbar, G1/G2 = 200/180 mbar, 1K Pot = 1.50 K / 4.5 mbar, MB = 37.9%. |
| 2027 | Start LHe transfer @ 37.1% |
| 2100 | Felt the inlet and outlet of the recovery meter during transfer. The inlet (i.e. where our fridge recovery plumbing enters the meter) is indeed cooler to the touch than the outlet. Not that much cooler, but it could be that the gas is much cooler than room temperature. If so this will undercount our recovery since the gas is denser than at room temperature. This is a possible argument for doing slower transfers. |
| 2115 | Adjust driver offsets on phonon channels to unrail them and get the baselines close to -0.7. Couldn't unrail DIB3 pB with offset adjustment or relock. Try zapping this channel twice. |
| 2120 | The zap sequence is over but strangely the base temperature and circulation pressures have gone up significantly and are not coming down. Tower = 65 mK, Still = 140 μbar, G1/G2 = 150/230 mbar. Maybe there is something wrong with the sequence when you select only DCRC 3, Channel B (which is what I chose). |
| 2123 | Try standard zap sequence of all DCRCs, all channels. Tower temp and Still pressure start falling immediately. It must have been stuck in permanent zap. Tower and Still spike in normal fashion during zap sequence and then fall again. |
| 2125 | Fill LN2 cold trap bath |
| 2129 | End transfer at 91.9% |
| 2130 | Tower = 48.6 mK and falling slowly. G1/G2 = 260/210 mbar and falling. Still = 65 μbar. |
| 2135 | Let pressure out of main bath |
| 2150 | Tower reached minimum of 45 mK, but while checking phonon channels it started rising for no damn reason. Pressures aren't changing. Tower rises to 54 mK, then flattens, decreasing again. |
| 2205 | Let pressure out of main bath |
| 2210 | Temperature looks ok, Tower = 41.9 mK. Check/adjust phonon channels: DIB3pC and DIB2pB are not showing pulses. (DIB2pB seemed to be acting up before.) |
| 2214 | Using TEST_n10-n13_flashandsweep.msl in sequencer, Start 6 hours of 30min background series. 2 at -4/+4 V, 2 at -4/0 V, 2 at -4/+6 V with FG=5/2/5, OG=8/3/8, with 1000 initial randoms, 1000 ending randoms, with 30s flash and 25 minute cooldown between series. Trigger on DIB1 phA with threshold of 30ADC bins, with 150 us pileup cut window. |