2016/08/17 (Wednesday)
| 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 180cm below standard position | |
| DCRCs powered overnight. Pumping on IVC with turbo pump overnight. Baked detector for 12 hours (ended at 4:58). Tower = 0.4 K during bake. | |
| 0840 | Tower/MC/Coldplate = 40.7/32.7/155 mK, Still = 1.28 K / 100 μbar, G1/G2 = 225/205 mbar, 1K Pot = 1.55 K / 5.5 mbar, MB = 75.6%. Boiloff rate: good. Released pressure at 10min and 30min yesterday after filling to 92.2%. |
| 0845 | Fill LN2 cold trap bath |
| 0850 | All phonon channels look good and baselines are around -0.7, no adjustment necessary after bake. |
| 0850 | Flash detector for 30 seconds using flashandflash script. As soon as sequence is finished and tower begins cooling, turn off DIB2 FETs. |
| 0917 | With DIB2 FETs turned off, 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. |
| 0947 | Stop data. After randoms finish, zero Qbias. Flash for 30s. Turn off DIB2 FETs after tower starts cooling again. |
| 1013 | With DIB2 FETs turned off, 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. |
| 1045 | Stop data. After randoms finish, zero Qbias. Flash for 30s. Turn off DIB2 FETs after tower starts cooling again. |
| 1110 | All phonon channels and DIB1 charge channels showing pulses. |
| 1113 | With DIB2 FETs turned off, 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. |
| 1145 | Stop data. After randoms finish, zero Qbias. Flash for 30s. Turn off DIB2 FETs after tower starts cooling again. |
| 1227 | Begin closing V6 to commence warm up procedure. |
| 1233 | V6 closed. Close V13B, and turn off He3 pump. Isolate Turbopump. Turn on MC Heater to 1.0mW. IVC pressure reads 1.0nbar. |
| 1258 | Tower temp = 1.36K, then jumps up to ~3K. |
| 1310 | Tower temp = 3.13K. IVC pressure = 220nbar. Open turbopump to commence pumping on IVC. Turn off MC Heater to let tower start cooling. |
| 1325 | Unlike yesterday the 1K Pot went back to oscillating on its own, so no need to open the needle valve more |
| 1340 | Tower = 2.3 K and flattish, G1 had peaked at 120 mbar, now 70 mbar and flattish. |
| 1345 | Open V13B and turn on 3He pump. G1/G2 settle at 130/115 mbar. |
| 1350 | Open V6 to 13.3%, G1/G2 begin to rise. Begin opening V6 in steps. |
| 1405 | V6 = 13.8%, Tower = 1.6 K, G1/G2 = 350 mbar, Still (P1) falls into readable range. 1K Pot = 1.55 K / 5.5 mbar, stopped oscillating briefly but then returned, may have emptied but seems to have refilled. |
| 1439 | Tower temp = 475mK and dropping. V6 at 15.4%, and G1/G2 are stable at ~305mbar. Open V6 all the way. |
| 1535 | Tower = 41.8 mK. G1/G2 = 230/205 mbar and falling slowly. Still = 90 μbar. |
| Tower has been cooled below Al transition with mu-metal shield at standard position | |
| 1550 | Adjust Driver Offsets to bring all phonon channels to life. All showing good pulses. |
| 1615 | After discussion with Anthony we discovered that another way to turn off FET power is in the ODB: Equipment/Tower01/Settings/DCRC2/LED/Enable15VPower. Enabling/disabling this is the same as writing 0800/0000 to the 30 address in a telnet session. We also learned that this is the LED power too, so that flashing won't work if the FET power is off. |
| 1630 | Fill LN2 cold trap full. |
| 1730 | Commence overnight bake of 12 hours. |