2016/08/16 (Tuesday)
| 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 5:34). Tower = 0.4 K during bake. | |
| 0840 | Tower/MC/Coldplate = 40.6/32.7/157 mK, Still = 1.29 K / 60 μbar, G1/G2 = 220/205 mbar, 1K Pot = 1.56 K / 5.5 mbar, MB = 49.2%. Boiloff rate: good. |
| 0845 | Fill LN2 cold trap bath |
| 0855 | All phonon channels look good, much better than yesterday, normal fall times, all channels show pulses. Adjust driver offsets so that all baselines are around -0.7 |
| 0858 | Flash detector for 6 seconds using flashandflash script |
| 0905 | Turn off DIB2 FETs using wr 30 0 in telnet session. Tower rises to 180 mK then falls again. |
| 0926 | 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. |
| 0955 | Begin filling HPGe dewar again. |
| 0956 | Stop data. After randoms finish, zero Qbias. Flash for 30s, and let cool. |
| 0959 | Flash finished. Begin 25min cooldown. |
| 1022 | With 23 minutes passed, turn off DIB2 FETs to allow for temperature spike. Tower temp spikes to 150mK, then falls again. |
| 1030 | Tower temp = 41.8mK and still dropping. Check phonon and DIB1 charge channels: all showing pulses. Wait for a few more minutes to let tower temp get below 40mK. |
| 1037 | Tower temp = 40.0mK. 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. |
| 1108 | Stop data. Tower temp = 38.6mK. After randoms finish, zero Qbias. Flash for 30s, and let cool. |
| 1111 | Flash finished. Begin 25min cooldown. |
| 1120 | Turn off DIB2 FETs to allow for temperature spike. |
| 1136 | Tower temp = 40.2mK. 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. |
| Forgot to set Qbias, so for the first couple randoms, the Qbias was set to 0, but 30 seconds later, the Qbias was properly set to -6/+6V. | |
| 1208 | Stop data. Tower temp = 38.7mK. After randoms finish, zero Qbias. Begin closing V6 to begin warmup procedure. |
| 1210 | Turbo pressure at 1nbar. Isolate turbopump from IVC during warmup. |
| 1215 | V6 closed. Close V13B and turn off He3 pump. Turn on MC heater to 1mW. Tower temp = 250mK and rising. |
| 1235 | Lower mu-metal shield 180cm below standard position |
| 1240 | Tower = 1.11 K and rising, G1 (condenser) = 35 mbar and falling. IVC = 7.4 nbar |
| 1248 | Tower 1.3 K → 3.0 K. IVC = 250 nbar. G1 (condenser) reached 30 mbar minimum, now 95 mbar and rising. Open turbo pump valve to pump out IVC. |
| 1300 | Tower = 3.3 K, G1 (condenser) = 125 mbar and rising. Turn off MC heater. 1K Pot rises to 1.68 K / 10 mbar, no longer oscillating, might be empty. Tweak needle valve open a little more. |
| 1315 | Tower = 2.6 K, G1 (condenser) peaked at 160 mbar, now 135 mbar and falling. 1KPot = 1.65 K / 19 mbar. |
| 1330 | Tower = 2.5 K, G1 (condenser) 100 mbar and falling more slowly. Open V13b and turn on 3He pump. G1/G2 settle at 135/125 mbar. |
| 1335 | Open V6 to 13.3%, G1/G2 begin to rise. Begin opening V6 in steps. |
| 1400 | V6 = 13.7%, Tower = 1.5 K, G1/G2 = 300 mbar, Still pressure (P1) falls into readable range. |
| 1430 | V6 = 14.4%, Tower = 1.1 K, G1/G2 = 310 mbar, Still pressure (P1) = 3.4 mbar |
| 1450 | V6 = 15.0%, Tower = 0.80 K, G1/G2 = 330 mbar, Still pressure (P1) = 1.6 mbar. Open V6 100%. |
| 1510 | Tower = 95 mK, G1/G2 = 335/305 mbar and falling (peaked at 370/340 mbar), Still = 150 μbar |
| 1535 | Tower = 44 mK, G1/G2 = 250/230 mbar and falling, Still = 110 μbar |
| Tower has been cooled below Al transition with mu-metal shield 180cm below standard position | |
| 1540 | Raise mu-metal shield back to its standard position. |
| 1545 | Commence LHe transfer (38.8%) |
| 1620 | Check phonon pulses, most railed, all restored by adjusting driver offsets and baselines set to near -0.7. All have good pulses and reasonable noise. |
| 1650 | Cease LHe transfer (92.2%) |
| 1653 | Fill LN2 cold trap. |
| 1700 | Commence 12 hour overnight bake using Flash&Flash script. |
| Release pressure from main bath. | |
| 1720 | Release pressure from main bath. |