2016/06/06 (Monday)
| Status | Slowly cooling to base since last week. 1K Pot keeps running low, need to keep opening needle valve. |
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| 1830 | MC/Tower/Cold Plate: 35.9/51.6/186 mK. Still: 1.09 K / 40 μbar. G1/G2: 105/110mbar. 1K Pot: 1.43K / 1.7 mbar. Main bath = 43.4% |
| Tower temperature somewhat unstable overnight. Open 1K Pot needle valve additional 5 degrees. | |
| 0840 | Fill LN2 cold trap bath |
| 0845 | MC/Tower/Cold Plate: 32.1/45.6/183 mK. Still: 1.18 K / 65 μbar. G1/G2: 135/140mbar. 1K Pot: 1.65K / 16 mbar. |
| Cooling power curve | |
|---|---|
| 0850 | Apply 5 μW power to MC. after 5 minutes, MC/Tower/Coldplate → 44.0/54.7/182 mK |
| 0900 | MC → 10 μW. after 5 minutes, MC/Tower/Coldplate → 56.5/65.6/183 mK |
| 0910 | MC → 20 μW. after 15 minutes, MC/Tower → 71.4/79.4 mK |
| 0930 | MC → 50 μW. after 15 minutes, MC/Tower → 101.1/104.0 mK |
| 0950 | Turn off MC heat |
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| 1050 | Power on DCRCs. DCRC55 attached to DIB1, DCRC50 attached to DIB2. |
| Current Setup: EBox → Cables → Gender Swapper → 3.2MHz Filter → DCRC. | |
| Zap SQUIDs for old times' sake. | |
| 1110 | Flash detector for 30s (i.e. minibake). |
| Had to set LED currents to +0.6mA instead of negative in order to get the LEDs to function properly. | |
| 1140 | Charge channels show only white noise - no pulses. Apply -/+4V to detector. Charge channels show jagged noise - no pulses, which looks somewhat like charge breakdown. Bake the crystal for 10 minutes. |
| 1225 | Set both sides of the detector to +/+4V and look at charge channels. DIB1 Qi shows mainly white noise, with some hint of pulses. All the other three charge channels show good pulses. |
| 1235 | Start 30min background series at +/+4V with 30s flash and 25min cooldown beforehand. Triggering on DIB1 Qo at 30ADC bins. |
| 1400 | Logger wasn't on, so no data from that series… Turn on logger, reset charge bias to +/+4V, and Start 30min background series at +/+4V with 30s flash and 25min cooldown beforehand. Triggering on DIB1 Qo at 30ADC bins. No randoms before or after. |
| As mentioned above, Flash script automatically writes an LED current of -0.6mA, so I had to manually change it after the script started flashing. I quickly went to the ODB → Equipment → Tower1 → Settings → DCRC(x) → LED and changed the LED Current settings from -0.6mA to +0.6mA. Since the Flash script was still flashing the detector, this immediately caused the detector to heat up. This is not a solution that will work for overnight data taking. |
| 1515 | Begin LHe transfer. (32.4%). |
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| 1555 | Cease LHe transfer. (95.6%). |
| 1600 | Increase DIB1 Qo trigger to 40ADC bins. Start 30min background series at +/+4V with 30s flash and 25min cooldown beforehand. Triggering on DIB1 Qo at 40ADC bins. 1000 randoms before and after. |
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| 1650 | Release pressure in main bath. |
| In the flashandflash.py script discussed in the MIDAS Sequencer Section, I found a section that created the MSL sequence file for the Flash And Flash sequence. In those three lines of code, were hardcoded the 0.1, 5.0, and -0.6 that correspond to the flash-on time, flash-off time (both in seconds), and the LED current in mA. I switched the -0.6 to a positive 0.6, and made a comment in the file to make it clear what I had done. Using the flash and flash function on the MIDAS webpage now properly flashes the detector. | |
| 1715 | Open 1K Pot needle valve additional 5 degrees. Pressure had fallen to 1.5 mbar. |
| 1730 | Start 15 hours of 2hour background series at +/+4V with 2min flash and 28min cooldown in between. Triggering on DIB1 Qo at 40ADC bins. 1000 randoms before and after. |