2016/08/18 (Thursday)
| 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. Pumping on IVC with turbo pump overnight. Baked detector for 12 hours (ended at 5:26). Tower = 0.4 K during bake. | |
| 0850 | Tower/MC/Coldplate = 40.5/32.7/158 mK, Still = 1.34 K / 100 μbar, G1/G2 = 220/205 mbar, 1K Pot = 1.54 K / 4.5 mbar, MB = 42.9%. Boiloff rate: good |
| 0855 | Fill LN2 cold trap bath |
| 0855 | Turn off DIB2 FET power using the ODB: /Equipment/Tower01/Settings/DCRC2/LED/Enable15VPower. Tower temperature spikes to 105 mK then falls again. |
| 0900 | All phonon channels look good and baselines are around -0.7, no adjustment necessary after bake. |
| 0903 | Flash detector for 30 seconds using flashandflash script. Note: it was not necessary to turn off the FET power after the sequence finished. Apparently the sequence turned it on (because there was definitely a flash, tower temperature spiked to 205 mK as normal) then turned it off again to return it to its state before the flash. |
| 0929 | Started a run by mistake without turning on the bias |
| 0932 | With DIB2 FETs turned off on the ODB, Manually start one 30min background series at -6/+6 V with FG=5/2/5, OG=8/3/8, with 1000 initial randoms, 1000 ending randoms. Trigger on DIB1 phA with threshold of 30ADC bins, with 150 us pileup cut window. |
| 1002 | Stop data. Wait for randoms to finish. Now attempting to use the flashandtake script, see whether it turns off the DIB2 FET power if you start with it off on the ODB |
| 1006 | Take an accidental series and abort, flash was only set to 6 seconds. |
| 1007 | With DIB2 FETs turned off, Start 2 hours of 30min background series at -6/+6 V with FG=5/2/5, OG=8/3/8, with 1000 initial randoms, 1000 ending randoms. Trigger on DIB1 phA with threshold of 30ADC bins, with 150 us pileup cut window. Using flashandtake script. |
| 1010 | After flash, Telnet session and ODB settings both indicate that DIB2 FET power is off. So this seems to work. |
| 1105 | During the second flash, it was observed that the Flash script did not turn on the 15V power supply when enabling the LEDs, so in fact the LEDs on DIB2 were not used during the flash. As such, the flashes today only reached a tower temperature of 205mK, instead of the usual ~260mK. So it appears that the Flash script has no interaction with the /Equipment/Tower01/Settings/DCRC2/LED/Enable15VPower entry in the ODB. This will need to be changed in order to properly flash with the automated script. |
| 1109 | Manually turn on the Enable15VPower ODB entry for DIB2, then run Flash&Flash script for 30s. After flashing, disable Enable15VPower ODB entry for DIB2. Let cool for 25 minutes, then take data. |
| 1136 | With DIB2 FETs turned off, manually start 30min background series at -6/+6 V with FG=5/2/5, OG=8/3/8, with 1000 initial randoms, 1000 ending randoms. Trigger on DIB1 phA with threshold of 30ADC bins, with 150 us pileup cut window. |
| 1207 | Stop data. Wait for randoms to finish. Zero Qbias. Turn on DIB2 FETs and flash for 30s. Then turn off DIB2 FETs and cooldown for 25min. |
| 1324 | Begin closing V6 to commence warm up procedure. Isolate turbopump. IVC pressure currently at 1.0nbar. |
| 1330 | V6 closed. Close V13B, and turn off He3 pump. Turn on MC Heater to 1.0mW. |
| 1345 | Lower mu-metal shield to 56.8cm below its standard position |
| 1400 | Tower = 1.29K, then jumps up to ~3K. |
| 1405 | Tower = 3.36K. IVC pressure = 250nbar. Open turbopump to commence pumping on IVC. Turn off MC Heater to let tower start cooling. |
| 1410 | Tower = 3.3 K, G1 = 110 mbar and rising. 1K Pot = 1.64 K / 7.5 mbar, not oscillating so maybe it's dry. Tweak needle valve open a little more. |
| 1420 | G1 peaked at 133 mbar and now falling, Tower cooling. Tower = 2.6K, G1 = 120 mbar |
| 1440 | Tower temp has stabilized at 2.5K. G1/G2 stabilized at 95/118mbar. Turn on He3 pump, open V13B, and begin opening V6. |
| 1505 | V6 = 13.7%, Tower = 1.6 K, G1/G2 = 340 mbar, Still (P1) falls into readable range. |
| 1551 | Commence LHe transfer (32.7%) |
| 1550 | Tower temp = 480mK and dropping. V6 at 15.6%. G1/G2 ~350 mbar. Open V6 fully. |
| 1615 | Tower = 59.6 mK. G1/G2 = 300/275 mbar and falling slowly. Still = 120 μbar. |
| Tower has been cooled below Al transition with mu-metal shield 56.8 cm below its standard position | |
| 1625 | Adjust Driver Offsets to bring all phonon channels to life. All showing good pulses. |
| 1630 | Raise mu-metal shield back to standard position. Tower = 47.1 mK. G1/G2 = 265/245 mbar and falling slowly, Still = 110 μbar |
| 1645 | Finish LHe transfer (91.6%). |
| 1648 | Fill LN2 cold trap full. |
| 1653 | Let pressure out of main bath. |
| 1715 | Let pressure out of main bath. |
| 1716 | Commence overnight bake of 12 hours. |