2016/08/09 (Tuesday)
| Setup: iZIP mode, DIB1/2/3 → cables → 3.2 MHz filters → DCRC55(1)/33(2)/50(3), Tower has been cooled below Al transition with mu-metal shield at standard position | |
| DCRCs powered overnight, took bg data last night. Pumping on IVC with turbo pump overnight. | |
| 0850 | Tower/MC/Coldplate = 39.9/47.8(?)/153 mK, Still = 1.30 K / 55 μbar, G1/G2 = 170/155 mbar, 1K Pot = 1.48 K / 2.8 mbar, MB = 36.9%. Boiloff rate: good. |
| 1K Pot has been somewhat oscillatory, 1.46-1.54 K, 2.5-4.0 mbar. Leave it for now, maybe this is an OK state. | |
| 0900 | Fill LN2 cold trap bath. |
| 0930 | Only six series of data were taken last night, expected 9. Last one started at 21:47. It looks like there were flashes at about 21:30 and 22:21… so there was a flash after the final series at the correct time but no data taken after that. Sequencer shows an error “Cannot start run: Cannot start run: or timeout froun: or timeout fro_01' on host c fro_01' on host”. So something went wrong with the DAQ apparently. On Messages there were some errors, the first was “22:39:10.169 2016/08/08 [mhttpd,ERROR] [system.c:4584:recv_tcp2,ERROR] unexpected connection closure”, so maybe an interruption in the network? |
| 1218 | Isolating turbo pump from IVC (gauge reads 1.4nbar) Begin warm up procedure. Closing v6. |
| 1230 | Tower temp = 320mK. V6 closed all the way. Close V13B and turn off He3 pump. Turn on MC Heater to 1.0mW. IVC pressure = 7.4nbar. |
| 1245 | Tower suddenly jumps from 0.9 K to >3 K, another He boiloff it seems. IVC = 630 nbar. |
| 1300 | Turn off MC heater. Lower mu-metal shield to 180 cm below standard position. Begin pumping on IVC with turbopump. Turn on 3He pump, open V13b. |
| 1310 | Tower/MC/Coldplate/Still = 3.3(falling)/3.7/6.7(?)/4.6 K |
| 1315 | Tower temperature = 3.6 K and rising, G1/G2 = 330/300 mbar and rising, 1K Pot = 2.30 K / 3.4 mbar. I think the 1K pot is dry. Tweak 1K Pot needle valve open a little more. 1K pot temperature falls quickly. G1/G2 begin to fall. |
| 1310 | Tower/MC/Coldplate/Still = 2.7(falling)/2.9/4.5/2.5 K, G1/G2 = 220 mbar and falling, 1K Pot = 1.64 K / 16 mbar and falling |
| 1355 | Tower = 2.3 K, G1/G2 = 85/75 mbar and flattening, 1K Pot = 1.61 K / 9.5 mbar and oscillating |
| 1400 | Open V6 to 13.4%, G2 starts rising. |
| 1430 | V6 has been opened to 13.8%. Still pressure drops into readable range. Tower = 1.4 K. G1/G2 peaking around 300 mbar between V6 adjustments. |
| 1438 | Take HPGe test data measuring pre-amp output directly with DCRC |
| 1455 | Open V6 all the way. Tower temp = 1.05K and falling. |
| 1505 | Tower = 440 mK and falling. G1/G2 = 325/300 mK and falling slowly. Still = 140 μbar and falling slowly. 1K Pot = 1.53 K / 5.5 mbar |
| 1510 | Tower = 200 mK and falling |
| 1515 | Tower = 100 mK and falling. G1/G2 = 275/255 mK and falling. Still = 95 μbar. 1K Pot = 1.56 K / 5.5 mbar |
| 1535 | Tower = 63 mK and falling. G1/G2 = 215/200 mK and falling. Still = 65 μbar. 1K Pot = 1.54 K / 4.5 mbar |
| 1600 | Tower = 47.8 mK, G1/G2 = 195/180 mK, Still = 60 μbar |
| 1601 | Raise mu metal shield. Tower has been cooled below Al transition with mu-metal shield 180 cm below standard position |
| 1604 | Commence LHe transfer (25.7%) |
| 1610 | Reset timing link on DCRCs (after reconfiguring for HPGe data and switching back to iZIP mode) |
| 1620 | Tower = 43.1 mK |
| 1630 | Adjust phonon driver offsets to get all the baselines around -0.7-something. Some noise in some of them but maybe just from the transfer. |
| 1635 | Tower = 41.3 mK, G1/G2 = 200/185 mbar and flattish, Still = 70 μbar |
| 1707 | Cease LHe transfer (91.8%) |
| 1715 | Let pressure out of Main Bath. |
| 1730 | Fill LN2 cold trap full. |
| 1740 | Let pressure out of Main Bath. |
| 1748 | Start 8 hours of 30min background series at -4/+4 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. |