2016/10/21 (Friday)
| Setup: DIB1/3/4 → 3.2 MHz filters → cables → DCRC55(1)/33(2)/50(3) taking 0-bias data overnight, no flashing Unfortunately DIB4pD railed at the beginning of the 15-hour data set last night |
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| 0855 | Tower/MC/Coldplate = 34.6/36.4/220 mK, Still = 1.21 K / 55 μbar, G1/G2 = 110/100 mbar, 1K Pot = 1.51 K / 3.8 mbar. MB = 71.8% Boiloff rate: good, slow-mode. Released pressure after yesterdays 90.9% fill at 14 and 41 minutes. |
| 0900 | Fill LN2 cold trap bath |
| 0900 | Tweak 1K Pot needle valve open a few more degrees. |
| 0858 | Stop data early to fix the railed channel. Besides DIB4pD a couple of other channels railed. Adjust all driver offsets (including unconnected channels) to place the baselines near -0.5 V. |
| 0913 | Start sequence of one-hour data series of 0V data with Frontend Gain = 5/2/5, OG = 8/3/8, with 1000 beginning and ending randoms, with no flashing in between series, and a 40ADC bin threshold trigger on DIB1 pB. (It's the 15-hour sequence but I plan to stop it early.) |
| 0915 | After LN2 fill and 1K Pot tweak, base is lower and pressures are higher: Tower = 32.8 mK, Still = 80 mbar, G1/G2 = 135/120 mbar, 1K Pot = 1.68 K / 22 mbar |
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| 1110 | Notice DIB2pC is railed. Stop data to fix it. |
|---|---|
| 1118 | Start sequence of one-hour data series of 0V data with Frontend Gain = 5/2/5, OG = 8/3/8, with 1000 beginning and ending randoms, with no flashing in between series, and a 40ADC bin threshold trigger on DIB1 pB. (It's the 15-hour sequence but I plan to stop it early.) |
| 1545 | Stop data taking |
| 1655 | Finish mini-IbIs on DIB1 to get biased resistances at new QET biases. |
| 1710 | Finish mini-IbIs on DIB3 to get biased resistances at new QET biases. |
| 1725 | Finish mini-IbIs on DIB4 to get biased resistances at new QET biases. |
| Channel | TES | QET bias [μA] | Rnormal [mΩ] | Rbiased [mΩ] | Rbiased/Rnormal |
|---|---|---|---|---|---|
| DIB1 pA | 4 | 179 | 87.4 | 47.8 | 54.7% |
| DIB1 pB | 3 | 182 | 82.2 | 42.2 | 51.3% |
| DIB1 pC | 2 | 184 | 73.5 | 50.7 | 69.1% |
| DIB1 pD | 9 | 191 | 88.5 | 50.3 | 56.9% |
| DIB3 pB | 11 | -176 | 95.8 | 66 | 68.9% |
| DIB3 pC | 5 | -175 | 99.7 | 59.5 | 59.7% |
| DIB4 pB | 8 | 225 | 86.5 | 55.4 | 64.1% |
| DIB4 pC | 1 | 190 | 96.2 | 47.1 | 49% |
| DIB4 pD | 0 | 199 | 80.4 | 45.5 | 56.6% |
Some of the Rnormal values are rather different from those measured yesterday. All the bias points seem to be around the halfway point of the transition.
| 1730 | Fill LN2 cold trap full. |
|---|---|
| 1750 | Put Cf source near fridge for overnight activation. |