Lena/Dec 2016
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December 2016
BACK/NEXT
12/07/2016
The signal amplitude from the OTS cell seems to be smaller than from the buffer gas cells. I talked to Mike and we are concerned that this might be because of the large field gradients due to the small shell coils. It might be possible that the field is not zero in all parts of the cell.
For this reason I've made a larger Helmholtz coil system. Here is the calibration of the coil system. There is also an anti-helmholtz coil in the Y direction, but it's not connected and not calibrated.
Calibration data
| Direction | B at Imax (240 mA), nT | B at -Imax (-240 mA), nT |
|---|---|---|
| X | 11380 | -10250 |
| Y | 13180 | -11600 |
| Z | 8140 | -9760 |
Coil calibration
| Direction | nT/mA |
|---|---|
| X | 45.06 |
| Y | 51.95 |
| Z | 37.29 |
Shell pinout (left to right)
- orange, yellow = X coil
- green, blue = Y coil
- purple, gray = Z coil
- black, white = thermoresistor