2016/08/11 (Thursday)
| 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. | |
| Last night's data is bad, 4 railed channels. | |
| 0745 | Tower/MC/Coldplate = 39.3/32.9/159 mK, Still = 1.36 K / 60 μbar, G1/G2 = 220/205 mbar, 1K Pot = 1.54 K / 5.0 mbar, MB = 45.0%. Boiloff rate: good. |
| 1K Pot has been somewhat oscillatory, 1.52-1.56 K, 4-6 mbar. Somewhat smaller oscillations than yesterday. | |
| 0750 | Fill LN2 cold trap bath. |
| 0800 | Adjust driver offsets to unrail all phonon channels and set the baselines between -0.8 and -0.7 V. |
| 0801 | Flash detector for 30 seconds manually. Tower peaks at 255 mK. |
| 0805 | Turn off DIB2 FETs (using “wr 30 0” in telnet session). This causes a temperature spike to 115 mK. |
| 0825 | Check all channels. Phonon baselines have shifted a little bit. DIB2 charge channels have the lower noise indicative of cold FETs. |
| 0828 | With DIB2 FETs turned off, Manually start one 30min background series at -4/+4 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. |
| 0845 | Tower/MC/Coldplate = 37.9/34.7(?)/153 mK. Tower and Coldplate are both colder now, maybe because the DIB2 FETs are off. |
| 0858 | Stop data series. After randoms finish, turn Qbias to 0/0 V, and flash for 30s using Flash & Flash script. |
| 0905 | Something strange happened with the flashing. The sequence continued well past 30 seconds. The Tower temperature rose to 180 mK and stayed there, rather than reaching 255 mK as before. Turn off sequence manually. |
| 0910 | Apparently the settings in DCRC_UI/Tools get changed back to their defaults. This is true for both flashandflash and flashandtake. Need to check these carefully. Resetting the flashandflash to 30 seconds on, 5 seconds off, duration 0.01 hours. |
| 0912 | Flash detector for 30 seconds manually. Tower peaks at 255 mK. |
| 0915 | Turn off DIB2 FETs. Again a brief temperature increase during the cooldown. |
| 0940 | Check channels, all look OK |
| 0944 | With DIB2 FETs turned off, Manually start one 30min background series at -4/+4 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. |
| 1014 | Stop data series. After randoms finish, turn Qbias to 0/0 V, and flash for 30s using Flash & Flash script. |
| 1018 | Flashing done. Wait 25 minutes for cooldown. |
| 1042 | Tower temp at 40mK. Turn off DIB2 FETs with still enough time in the cooldown to cope w/ the minor temperature spike caused by the FETs. |
| 1046 | Check channels, all look OK |
| 1048 | With DIB2 FETs turned off, Manually start one 30min background series at -4/+4 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. |
| 1119 | Stop data series. After randoms finish, turn Qbias to 0/0 V. |
| 1232 | Perform mini-IbIs on all 3 DIBs. This is to investigate whether anything has changed since the last data taken after cooldown with the shield at standard position, because the data looks different. The TES resistances are pretty similar except for DIB2pB (Side2pA), which previously had a biased resistance of 209 mΩ, now 281 mΩ. It's normal resistance also looks different, previously 951 mΩ, now 1209 mΩ. This channel has the highest Rn. |
| 1245 | Because DIB2pB has the highest Rn, try redoing the IbIs with higher biases (instead of -250 and -300, use -300 and -350 μA). But the biased and normal resistances come out pretty similar. |
| 1251 | Start one 30min background series at -4/+4 V using the Flash & Take script (i.e. FETs on) 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. |
| 1400 | Set the detector to bake for 1 hour. Tower rises to 400 mK during bake. |
| 1415 | Commence LHe transfer (35.8%). |
| 1510 | End LHe transfer (81.0%). |
| 1537 | Release pressure from Main Bath. |
| 1600 | Tower temp below 40mK. Turn off FETs on DIB2 and check phonon channels. DIB2 pB is exhibiting some noise that occasionally looks like upside down pulses, but other channels look fine. |
| 1602 | Release pressure from main bath. |
| 1612 | DIB2 pB is looking better now. Tower temp = 39mK. With DIB2 FETs turned off, Manually start one 30min background series at -4/+4 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. |
| 1643 | Fill LN2 cold trap full. |
| 1644 | Stop data series. After randoms finish, take a look at the pulses and turn on DIB2's FETs. |
| 1651 | Pulses look good, and DIB2's FETs are on. Start 8 30min background series at -4/+4 V using the Flash & Take script (i.e. FETs on) 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. |