Table of Contents
2016/03/28
Magnetometer Check
| 1530 | Attempt to calibrate newly acquired magnetometer by comparing values to previously measured values. While the fridge is open, we cannot take measurements in the pit because the dewar is there. Once we've started the run, we'll take measurements in the pit. Measurements taken using z-axis of magnetometer and pointed by hand. More stabilized measurements may be necessary: |
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| Magnetic field (μT) as measured on 2016/03/09 | ||
|---|---|---|
| With shield | Without shield | |
| North | -2 | 13 |
| West | 0 | -5 |
| Up | -4 | -61 |
| Measurement uncertainty: 2-3 μT | ||
| Magnetic field (V) as measured with new magnetometer | |
|---|---|
| North | 0.51 |
| West | 0.67 |
| Up | -4.61 |
| Measurement uncertainty: ~0.03 V | |
| According to an email, each volt should correspond to 100mGauss or 10uT. If that were the case, the measurements would be as follows: |
| Magnetic field (uT) if new magnetometer is properly calibrated | |
|---|---|
| North | 5.1 |
| West | 6.7 |
| Up | -46.1 |
| Measurement uncertainty: ~0.3 uT | |
| The difference in measurements don't line up to a nice ratio, so perhaps we need to take the measurements in the pit as we did before. |
Broken phonon connection observations
| 1600 | Observations on the broken phonon channel connection on G114, Pin1 on DIB1 (DIB1pA): |
|---|---|
| On Pin 1, low resistance between pin and DIB pad | |
| On Pin 2, connection evident between DIB pad and wirebond (gently touching wirebond with ohmmeter probe) | |
| On Pin 1, no connection evident between DIB pad and wirebond | |
| Looking closely while gently pushing Pin 1 wirebonds down with tweezers, could see the DIB-pad end slide along the pad. So not really connected to the pad, just slides across. |
We intend to try to fix this connection with the wirebonder on the third floor, in lab 388A
| Photos of wirebond connections for DIB1pA pin1 on G114. It's the one at the end of the DIB, nearest to the cirlex clamp. | |
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