2017/06/07 (Wednesday)
| Setup: DIB1/3/4 → 3.2 MHz filters 3/1/2 → cable 3/1/2 →gender changer 3/1/2 → HVConn 1/3/2 → HV 1/2 → DCRC55(1)/DCRC33(2) | |
| PuBe source in paraffin barrel behind shield (west side) | |
| was there a bake here?? temperature log indicates bake was started at 23:39 with 20 minute duration |
|
| 0011 | retrolog (Anthony) 1600s bake |
| 0011 | pre-bias to V=65.56V apparent |
| 0036 | finally tuned detector to HV=51.28, Vtest=3.25 mV –> Vdetector = 49.98 V |
| 0038 | Start 7 1-hour data series of 1-sided 50V HV coincidence data with Frontend Gain = (15/15/5)/(3/4/4), OG = 4/2, QET biases = 30 column from table from May 24, with 1000 beginning randoms, no flashing, and a 500ADC bin threshold trigger on DCRC4 pA (external trigger). Running OR trigger of NaI detectors with PuBe source on west side of shield. NaI detector C has 311 mV threshold and detector B has 288 mV threshold |
| 0043 | before leaving Vtest has creeped to 3.36 mV |
| 0730 | heading to lab, should be there by 8. -mf |
| 0753 | Tower = 33.1 mK, Main bath = 74.2% |
| 0755 | HV = 51.28 V, Vtest = 4.02 mV → Vdetector = 49.67 V |
| 0755 | Dial HV down to 0 V, then short leads. |
| About to bake, noticed the duration had been changed to 20 minutes. Not sure why. For the last two data sets there is no indication in the run diary of a bake at all. I'm sure they were done but I don't know why they're not noted. | |
| 0805 | Begin 30 minute bake with DCRCs 1&2. |
| 0810 | Fill LN2 cold trap bath |
| 0852 | Dial HV up to 65 V |
| 0905 | Dial HV down to 52.1 V, targeting Vdetector = 50.0 V |
| 0920 | There is “hair” on the tops of pulses in DCRC1pC. Only high-amplitude pulses are affected. In the affected pulses the PSD shows a high frequency oscillation peak, 200 kHz, like we see when front-end gain is too high. But reducing it doesn't help. Increasing the QET bias doesn't help either - I think that suggests that the problem is not at the TES itself. |
| 0930 | Changed DCRC1pC SQUID bias from -82 to -75. This gets rid of the hair. Maybe should redo the SQUID tuning to optimize the response, but for now will just leave this setting. |
| 0930 | Tower = 33.4 mK, a little warmer than base but pretty close |
| 0936 | Start 2 1-hour data series of 1-sided 50V HV coincidence data with Frontend Gain = (15/10/10)/(5/4/4), OG = 4/2, QET biases = 30 column from table from May 24, with 1000 beginning randoms, no flashing, and a 500ADC bin threshold trigger on DCRC4 pA (external trigger). Running OR trigger of NaI detectors with PuBe source on west side of shield. NaI detector C has 311 mV threshold and detector B has 288 mV threshold |
| 0945 | HV = 51.54 V, Vtest = 3.69 mV → Vdetector = 50.06 V. Adjust HV downward a little. |
| 0950 | Tower = 33.3 mK |
| 1140 | HV = 51.47 V, Vtest = 3.59 mV → Vdetector = 50.03 V |
| 1140 | Dial HV down to zero and short leads |
| 1145 | Begin 30 minute bake with DCRCs 1&2 |
| 1235 | pre-bias to HV = 68.1V |
| 1302 | got voltage to HV=51.6V, Vtest = 4 mV → Vdetector = 49.998 V |
| 1305 | Start 5 1-hour data series of 1-sided 50V HV coincidence data with Frontend Gain = (15/15/5)/(3/4/4), OG = 4/2, QET biases = 30 column from table from May 24, with 1000 beginning randoms, no flashing, and a 500ADC bin threshold trigger on DCRC4 pA (external trigger). Running OR trigger of NaI detectors with PuBe source on west side of shield. NaI detector C has 311 mV threshold and detector B has 288 mV threshold |
| 1306 | Vtest has migrated to 3.94 mV |
| 1314 | Tower/MC/Coldplate = 33.4/31.2/191 mK, Still = 1.21 K / 0.110 mbar, G1/G2 = 226/205 mbar, 1K Pot = 1.674 K / 22.0 mbar. Main bath = 66.6%. Predicted level: 67.8% |
| 1659 | Fill LN2 cold trap full. |
| 1818 | Vtest is 3.37 |
| 1818 | turn down voltage |
| 1818 | retrolog (Anthony) 900s bake |
was there a bake here??
| 1851 | pre-bias to HV = 68.8 |
|---|---|
| 1859 | settled to HV = 68.8, Vtest = 7.26 → Vdetector = 65.89V |
| 1912 | HV = 51.47 V, Vtest = 3.65 mV → Vdetector = 50.013V good enough for me! |
| 1913 | Start 5 1-hour data series of 1-sided 50V HV coincidence data with Frontend Gain = (15/15/5)/(3/4/4), OG = 4/2, QET biases = 30 column from table from May 24, with 1000 beginning randoms, no flashing, and a 500ADC bin threshold trigger on DCRC4 pA (external trigger). Running OR trigger of NaI detectors with PuBe source on west side of shield. NaI detector C has 311 mV threshold and detector B has 288 mV threshold |