2012/07/10
| 0931 | G1=72mbar, G2=64mbar. 1K pot=1.837K. P2=1000mbar, P1=1000mbar, MC=2.1K. Stop condensing. Start circulation |
|---|---|
| 1015 | Fed Cricket (3 pieces) |
| 1030 | Filled LN2 cold trap. |
| 1032 | Abort circulation sequence. MC H35=93mK. 1K pot = 1.841K. |
| 1054 | Set 1K pot to 1.5K. Pushed the He cold trap pass the G10 plate. The quick coupling nut can not be fully tightened because the He cold trap is bent. Need to straighten it. |
| 1400 | Measure resistances and temperatures. Mixing chamber temperature: 62.9 mK |
| 1815 | Fed Cricket (4 pieces). |
| Table 1: Temperature of Stages. | |
|---|---|
| Stage | Measured Resistance [kΩ] |
| Still | 4.5 |
| Cold plate | 14.5 |
| Mixing chamber | 32.1 |
| Table 2: DIB 2, DCRC 33 | ||||||
|---|---|---|---|---|---|---|
| Phonon Channel | SQUID Bias (micro A) | Lockpoint (mV) | Modulation Depth (mV) | QET Bias (uA) | Front End Gain | Comment |
| A | 68.35 | 3.50 | 4.6 | -65 (NI) | 2.5 | |
| B | 68.35 | 1.85 | 3.3 | -105 (NI) | 3.2 | |
| C | 85.92 | 3.79 | 4.7 | -567 (NI) | 3 | |
| D | 96.66 | 3.60 | 4.3 | -90 (I) | - | 1.5 Front end gain? |
| Table 3: DIB 3, DCRC 30 | ||||||
|---|---|---|---|---|---|---|
| Phonon Channel | SQUID Bias (micro A) | Lockpoint (mV) | Modulation Depth (mV) | QET Bias (uA) | Front End Gain | Comment |
| A | 64.45 | 3.99 | 3.5 | -130 | 2.8 | |
| B | 71.28 | 5.25 | 4.7 | -110 | 4.2 | Driver Offset = 1.08 |
| C | 85 | 4.38 | 4.4 | -140 | 3 | |
| D | 82.02 | 2.72 | 4.8 | -140 | 2.6 | |