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2011/04/09

0024 Stop flashing.
0104 Start 07110409_0104_F0001. DAQ flashed the detector again. Need to wait to cool down.
0154 Start 07110409_0154_F0001. Calibrated +6V on Q1-4. Trigger: Q1(60ADC) OR Q2(36ADC) OR Q3(30ADC) OR Q4(30ADC); coincidence time 50us. Trace length 1024, lookback time 100us. DCRC30 on DIB1, ZIP2, master; DCRC33 on DIB2, ZIP1, slave. Auto run enabled, take data 15min, flash 20min, cooldown 40min. Flash settings: DIB2, LED 1&2; DIB1, LED1; LED current 0.6mA, 100us ON, 2500us OFF. Tower T 60.8mK.
0949 1K pot ran away at about 7am in the morning. Stop taking data at 07110409_0925. Stop flashing started by DAQ. Pump mixture into dump. The data sets up to 07110409_0655 are good.

0953 Close V4A, stop 1K pot. See if warming up the 1K pot to 4K would help.
1031 Filled N2 cold trap.
1115 Open V4A to start 1K pot. P2 drops quickly. The blockage is still there. Open the 1K pot needle value a little bit more. 1K pot temperature and p2 both increase. The fridge can still operate in this mode.
1121 Close V5 and V6. Open V4 and V3 to condense mixture. G1=206mbar, G2=361mbar. P2=20mbar, 1Kpot 1.646K. It maybe a better idea to let mixture run through N2 cold trap when condensing.
1136 The 1K pot still running down. But I'll start circulation anyway.
1138 1K pot is very sensitive to the change in circulation line. I think the pot doesn't have much liquid helium in it. This may be due to a blockage in the he intake line.
1546 Tower temperature 60.7mK. 1K pot still keeps running down but the fridge otherwise is running OK. I'll take more data.
1547 Start data 07110409_1547_F0001. Calibrated +8V on Q1-4. Trigger: Q1(60ADC) OR Q2(36ADC) OR Q3(30ADC) OR Q4(30ADC); coincidence time 50us. Trace length 1024, lookback time 100us. DCRC30 on DIB1, ZIP2, master; DCRC33 on DIB2, ZIP1, slave. Auto run enabled, take data 15min, flash 20min, cooldown 40min. Flash settings: DIB2, LED 1&2; DIB1, LED1; LED current 0.6mA, 100us ON, 2500us OFF. Tower T 60.7mK.
1556 Stop the run. Q2 and Q4 have a baseline around -2V. Q2 actually railed. After setting bias to 0V. Q2 and Q4 still behave the same. I'll flash the detector for a while and see if it'll be fixed.
1930 Begun Helium transfer.
2028 Finished Helium transfer. With -4V bias Q2 and Q4 still have -2V offset. Cycle power of two boards.
2030 After cycle the power, Q2 and Q4 come back. Q1 and Q3 are still fine.
2100 Flash detector. Tower temperature went up to 547mK. Looked fine.
2120 Stop flashing the detector.
2128 Created DAQ setting files with different biases.
2133 Fill N2 cold trap.
2335 Start taking data 07110409_2335_F0001. Calibrated -1V on Q1-4. Trigger: Q1(60ADC) OR Q2(36ADC) OR Q3(30ADC) OR Q4(30ADC); coincidence time 50us. Trace length 1024, lookback time 100us. DCRC30 on DIB1, ZIP2, master; DCRC33 on DIB2, ZIP1, slave. Take data 60min after 20min flashing. Tower T 61.5mK. The polarity was flipped.
2343 1K pot 1.345K, keeps dropping

Calibrated +6V bias

Data:

07110409_0154
07110409_0309
07110409_0425
07110409_0540
07110409_0655

Scipt

The cuts are defined as

  • cQ# = max([Q1, Q2, Q3, Q4], [], 2)==#
  • cQCchisq = cQ1chisq & cQ2chisq & cQ3chisq & cQ4chisq
  • cE1 = 15 < Q1;
  • cE2 = 15 < Q2;
  • cE3 = 10 < Q3;
  • cE4 = 20 < Q4;
  • cE = 50 < Qsum.

Comments:

Plots

-1V 1 hour neutralization

Data:

07110409_2335

Script

I don't know where the gap in the event time is from. This maybe due to computer time error or labview.

Plots