2017/04/26 (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/DCRC33 | |
| Stronger 88Y source is out, hanging from a string on the left side (south side) of the fridge by the wall, just above the fridge hoist crank. | |
| 0902 | Tower = 32.9 mK, Main Bath = 65.7% |
| 0905 | Fill LN2 cold trap bath |
| 1010 | HV = 49.47 V, Vtest = 1.2 mV |
| 1040 | Finish IbIs on DCRC1pA/DIB1pA/Side1pE at 50V |
| 1043 | Dial HV down to 0V |
| 1100 | Finish IbIs on DCRC1pA/DIB1pA/Side1pE at 0V |
| 1106 | Flash detector for 30 seconds |
| 1110 | Put 88Y source back in safe |
| 1115 | Move PuBe neutron source into lab. It is in its paraffin-filled transport barrel, behind the shield on the west side of the fridge on top of the stool. |
| 1125 | Measure raw rate in HV#4 with PuBe source present, 133 counts in 1 second = 133 Hz |
| 1154 | Start 1-hour data series of 1-sided 0V HV data with Frontend Gain = (20/20/5)/(3/5/2), OG = 4/2, QET biases = table no flashing, and a 17ADC bin threshold trigger on DCRC1 pA |
| 1419 | Start 1-hour data series of 1-sided 0V HV data with Frontend Gain = (20/20/5)/(3/5/2), OG = 4/2, QET biases = table no flashing, and a 17ADC bin threshold trigger on DCRC1 pA |
| New standardized QET biases for HV mode based on most recent IbIs: | |||
|---|---|---|---|
| channel | QET bias | QETbias*prefactor [uA] | Date |
| DCRC1pA/DIB1pA/Side1pE | 127.6 | 30 | April 26 |
| DCRC1pB/DIB1pB/Side1pB | 139.8 | 30 | April 21 |
| DCRC1pC/DIB1pC/Side1pD | 127.6 | 30 | April 5 |
| DCRC2pB/DIB3pC/Side1pA | -117.9 | 30 | April 19 |
| DCRC2pC/DIB4pC/Side1pC | -149.5 | 30 | April 5 |
| DCRC2pD/DIB4pD/Side1pF | -147.7 | 30 | April 5 |
| 1525 | Prebias HV = 65 V |
|---|---|
| 1529 | Set QET biases as per above table |
| 1535 | Reduce HV = 50 V |
| 1541 | Start a 1-hour data series of 1-sided 50V HV coincidence data with Frontend Gain = (20/20/5)/(3/5/2), OG = 4/2, QET biases = table above, with 10000 beginning randoms, no flashing, and a 1500ADC bin threshold trigger on DCRC4 pA (TTL signal) Running OR trigger of NaI detectors with PuBe source on west side of shield. |
| 1723 | Start 12 1-hour data series of 1-sided 50V HV coincidence data with Frontend Gain = (20/20/5)/(3/5/2), OG = 4/2, QET biases = table above except DIB 1 C, modified to 134uA, with 10000 beginning randoms, no flashing, and a 1500ADC bin threshold trigger on DCRC4 pA (TTL signal) 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 |
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