| | Setup: DIB1/3/4 → 3.2 MHz filters → cables 1,2,3 → HV board inputs 1,3,2 → HV board outputs 1,2 → DCRC55(1)/50(3) |
| 0855 | Tower/MC/Coldplate = 31.7/34.6/211 mK, Still = 1.15-1.25 K / 120 μbar, G1/G2 = 165/155 mbar, 1K Pot = 1.74 K / 55 mbar. MB = 63.9%.
Boiloff rate: between slow- and fast-mode. Probably would have been better if pressure were released later yesterday, last release was 45 minutes after fill. |
| 0900 | Return Cf source to safe. |
| 0905 | Fill LN2 cold trap bath. |
| 0940 | Attempt measurement of parasitic resistance Rp for HV1pA. Using the assumption that the shunt resistance Rsh has the same Rp as the TES, we can say:
Rp = (ΔIb/ΔIs - 1)/(2 - ΔIb/ΔIs) * Rsh
Set QET bias to 0, 10, 20 μA, find baselines of 0, -0.382, -0.761 V, with Driver Gain = 2x. This yields Rp = 11 mΩ. |
| 1350 | Using same method as above, measured Rp for remaining channels. Accounting for this changes Rn considerably (c.f. 2016/10/27) |