2017/10/26 (Thursday)
| Setup: DIB 1/3/4 → 3.2 MHz filters 1/2/3 → cable 1/3/2 → gender changers → rerouting boards 1/3/4 → DCRC55(1)/33(2)/50(3) | |
| Overnight baked for 12 hours. | |
| 1027 | Tower/MC/Coldplate = 82.7/57.3/366 mK, Still = 1.26 K / 0.20 mbar, G1/G2 = 265/258 mbar, 1K Pot = 1.60 K / 19 mbar. MB = 60.5% |
| 1034 | Fill LN2 cold trap full. |
| 1045 | Redo a couple of these from yesterday that looked a little strange in data. |
| 1047 | Start series of data with Vbias(external) = -10.00 V, with 1000 beginning randoms, and a 40/30/15/40/40 ADC bin threshold trigger on DCRC1qI/qO/DCRC2qO/DCRC3qI/qO, with trigger baseline = 32 samples and trigger length = 10 samples (these are 2x the usual values). |
| 1110 | Stop run, ground and flash for 60 s |
| 1141 | Start series of data with Vbias(external) = -25.01 V, with 1000 beginning randoms, and a 40/30/15/40/40 ADC bin threshold trigger on DCRC1qI/qO/DCRC2qO/DCRC3qI/qO, with trigger baseline = 32 samples and trigger length = 10 samples (these are 2x the usual values). |
| 1208 | Stop run, ground and flash for 60 s |
| 1230 | Start series of data with Vbias(external) = -40.01 V, with 1000 beginning randoms, and a 40/30/15/40/40 ADC bin threshold trigger on DCRC1qI/qO/DCRC2qO/DCRC3qI/qO, with trigger baseline = 32 samples and trigger length = 10 samples (these are 2x the usual values). |
| 1251 | Stop run, |
| 1312 | Oops, forgot to ground it. Ground and flash for 60 s |
| 1339 | Start series of data with Vbias(external) = -70.0 V, with 1000 beginning randoms, and a 40/30/15/40/40 ADC bin threshold trigger on DCRC1qI/qO/DCRC2qO/DCRC3qI/qO, with trigger baseline = 32 samples and trigger length = 10 samples (these are 2x the usual values). |
| 1401 | Stop run, ground and flash for 60 s |
| 1423 | Start series of data with Vbias(external) = -90.0 V, with 1000 beginning randoms, and a 40/30/15/40/40 ADC bin threshold trigger on DCRC1qI/qO/DCRC2qO/DCRC3qI/qO, with trigger baseline = 32 samples and trigger length = 10 samples (these are 2x the usual values). |
| 1446 | Stop run, ground and flash for 60 s |
| 1509 | Let's take a long series just triggering on the central channel to try and see the lower 241Am lines. |
| 1510 | Start series of data with Vbias(external) = 90.0 V, with 1000 beginning randoms, and a 40 ADC bin threshold trigger on DCRC3qO, with trigger baseline = 32 samples and trigger length = 10 samples (these are 2x the usual values). This threshold was about 30 keV, not low enough |
| 1643 | Stop run. Dump sizes began to fall around minute 60 |
| 1655 | Stop programs, power down DCRCs. Put DCRC1 on DIB3 to try and operate the vacuum electrode LEDs. |
| 1656 | On DIB2 switchboard, turn off DIB LED switches (U6-1,U6-2) and turn on external IR LED switches. Power DIB3 IR LED1 using DCRC1 with standard LED settings: LEDPulseWidth/LEDRepRate/LED1Current = 100/5000/0.6. Tower temp rises to 92.5 mK |
| 1701 | Power DIB3 IR LED 1 using DCRC1 with LED settings: LEDPulseWidth/LEDRepRate/LED1Current = 100/5000/0.8. Tower temp rises to ~250 mK |
| 1703 | Power DIB3 IR LED 1 using DCRC1 with LED settings: LEDPulseWidth/LEDRepRate/LED1Current = 100/5000/1. Tower temp rises to ~310 mK |
| 1703 | Also enable LED2. Power DIB3 IR LEDs using DCRC1 with LED settings: LEDPulseWidth/LEDRepRate/LED1Current/LED2Current = 100/5000/1/1. Tower temp rises to ~410 mK |
| 1708 | Also enable LED2. Power DIB3 IR LEDs using DCRC1 with LED settings: LEDPulseWidth/LEDRepRate/LED1Current/LED2Current = 100/5000/2/2. Tower temp rises to ~710 mK |
| 1710 | Turn off LEDs. Set DIB3 switchboard to connect UV LEDs. Wait for tower to cool. |
| 1712 | Fill LN2 cold trap full. |
| 1718 | Tower = 340 mK. It's taking much longer to cool than when we baked/flashed using the DIB LEDs. Looking back, it also seemed to heat more slowly. Maybe these electrode LEDs, which are pointed right at the crystal face, heat the crystal more than the DIB LEDs and we're now seeing the slow crystal cooling. |
| 1728 | With the DIB IR LEDs, it usually takes 1.5 min to cool from ~700mK to ~200mK. Now it's taking ~20 min |
| 1954 | Tower = 72.5 mK |
| 1955 | Power DIB3 UV LED 1 using DCRC1 with LED settings: LEDPulseWidth/LEDRepRate/LED1Current = 100/5000/-0.6. Tower temp rises to ~170 mK |
| 2015 | Also enable UV LED2. Power DIB3 UV LEDs using DCRC1 with LED settings: LEDPulseWidth/LEDRepRate/LED1Current/LED2Current = 100/5000/-0.6/-0.6. Tower temp rises to ~215 mK |
| 2029 | Power DIB3 UV LEDs using DCRC1 with LED settings: LEDPulseWidth/LEDRepRate/LED1Current/LED2Current = 100/5000/-0.8/-0.8. Tower temp rises to ~320 mK |
| 2100 | Power DIB3 UV LEDs using DCRC1 with LED settings: LEDPulseWidth/LEDRepRate/LED1Current/LED2Current = 100/5000/-1.5/-1.5. Tower temp rises to ~415 mK |
| 2115 | Power DIB3 UV LEDs using DCRC1 with LED settings: LEDPulseWidth/LEDRepRate/LED1Current/LED2Current = 100/5000/-2/-2. Tower temp rises to ~500 mK |
| 2128 | Power DIB3 UV LEDs using DCRC1 with LED settings: LEDPulseWidth/LEDRepRate/LED1Current/LED2Current = 100/5000/-2.5/-2.5. Tower temp rises to ~560 mK |
| 2139 | Power DIB3 UV LEDs using DCRC1 with LED settings: LEDPulseWidth/LEDRepRate/LED1Current/LED2Current = 100/5000/-3.5/-3.5. Tower temp rises to ~665 mK |
| 2217 | Power DIB3 UV LEDs using DCRC1 with LED settings: LEDPulseWidth/LEDRepRate/LED1Current/LED2Current = 100/5000/-4.0/-4.0. Tower temp rises to ~700 mK |
| 2305 | Let's leave this to UV bake overnight. Run simple sequence to wait 5 hours and then turn off DCRC1 LEDs. |
| Conclusion: It seems that the LEDs are operating with the RevC.1 DCRC, albeit at higher current settings than we've used in the past. We can also achieve the same tower temperature of ~700 mK using either set of LEDs. |