2016/01/19 (Tuesday)
| Setup: iZIP mode, DIB1/2/3 → cables → 3.2 MHz filters → DCRC55/33/50 | |
| Taking Y-88 data overnight. Last flash at 06:32. | |
| 0935 | Tower/MC(H35)/MC sensor/Cold Plate = 31.6/27.4/40/154 mK, Still = 1.15 K / 0.12 mbar, G1/G2 = 160/135 mbar, 1K Pot = 1.73 K / 19 mbar, Main bath = 68.1% |
| 0940 | Fill LN2 cold trap Dewar. |
| 0945 | Looking at pulses to see if they stayed overnight. Also eventually going to run a mini-IbIs to determine if QET biases are close to optimized. |
| All there, and all good. Slight ~200Hz noise. | |
| 0955 | Perform “mini IbIs” calculations, observing phonon baseline voltages at varied QET biases: the standard bias and two large biases: |
| Vo (250 μA) | Vo (300 μA) | Ibias (μA) | Vo (Ibias) | ||
|---|---|---|---|---|---|
| DIB 1 | pA | -0.212 | -0.552 | 114.2 | -0.696 |
| pB | 0.228 | -0.094 | 127.1 | -0.668 | |
| pC | 0.274 | -0.033 | 117.8 | -0.714 | |
| pD | -0.052 | -0.3755 | 100.8 | -0.645 | |
| DIB 2 | pA | -0.321 | -0.5485 | -112.6 | -0.932 |
| pB | -0.1545 | -0.3545 | -112.6 | -0.798 | |
| pC | 0.108 | -0.0745 | -138.8 | -0.860 | |
| pD | -0.166 | -0.4025 | -97.7 | -0.828 | |
| DIB 3 | pA | 0.763 | 0.514 | 110 | -0.640 |
| pB | -0.166 | -0.473 | 100.7 | -0.788 | |
| pC | -0.0725 | -0.367 | 92.5 | -0.552 | |
| pD | 0.426 | 0.080 | 119.2 | -0.631 | |
| note: for DIB2 (RevC) -250 and -300 μA were used | |||||
Resistances of TESs at the current QET bias settings are derived below following the method described on 2015 Sep 25:
| Derived TES resistances (Ω) | |||
|---|---|---|---|
| DIB 1 | DIB 2 | DIB 3 | |
| pA | 0.197 | 0.23 | 0.152 |
| pB | 0.19 | 0.246 | 0.173 |
| pC | 0.173 | 0.267 | 0.176 |
| pD | 0.169 | 0.186 | 0.157 |
| 1140 | Set QET biases back to previous values. All the phonon channels show pulses. No obvious sign of 200Hz noise. |
|---|---|
| 1148 | Start 20 hours of 30min 88-Y series at +4/-4V with FG=5/2/5, OG=3, with 1000 initial randoms, 1000 ending randoms, 30s flash and 25 minute cooldown before series. Trigger on DIB1 phA with threshold of 30ADC bins. |
| 1701 | Fill LN2 cold trap full. |