2021/12/27 (Monday)
- Lab in-personnel: Matt
| Status | Run 75 in progress |
|---|---|
| Setup | Tower Faces 5/3/2 → Cables 2/1/3 → nothing/diverter_board/nothing → DCRC55(1)/DCRC50(3)/DCRCx(4) Lead shield in place |
| 1105 | Goldman/Tower/MC(H35)/Coldplate = 50.0/121/37.7/213 mK, Still = 1.69±0.06 K / 0.130 mbar / 0 mW, G1/G2= 231/228 mbar, 1K Pot = 1.63 K / 19±1 mbar, MB = 23.6%. |
| 1110 | Fill LN2 cold trap bath |
| 1300 | Tried applying some Still heat. Goldman thermometer was at 50.8 mK after LN2 fill. Still = 0 mW : 49.8 mK. Still = 3 mW → 49.8 mK. Still = 6 mW → 49.6 mK. Still = 0 mW → 50.7 mK. |
| 1355 | Perform mini IbIs on DCRC1pA to find QET bias corresponding to dP/dI = 1 uV: 241 uA. |
| 1505 | Finish mini-IbIs on all channels, find QET biases for dP/dI = 1 uV on each: see below: |
| Goldman temperature | 50.85 mK |
|---|---|
| Channel | QET bias (uA) |
| DCRC1pA | 241 |
| DCRC1pB | 314 |
| DCRC1pC | 274 |
| DCRC1pD | 178 |
| DCRC3pA | 160 |
| DCRC3pB | 162 |
| DCRC3pC | 217 |
| DCRC3pD | - |
| DCRC4pA | 205 |
| DCRC4pB | 148 |
| DCRC4pC | 256 |
| DCRC4pD | 189 |
note: DCRC1pB has a weird normal part of the IbIs curve so it's hard to do mini-IbIs. QET bias above is a guess based on how each QET bias changed from that calculated from IbIs taken a few weeks ago.
| 1522 | Begin LHe transfer @ MB = 14.9% |
|---|---|
| 1558 | End LHe transfer @ MB = 93.6% |