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Helmholtz Coils
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The 2D scan box is surrounded by a large Helmholtz Coil cage.
They are there for magnetic field suppression and divided into a x, y, and z
component.

.. figure:: ../../images/instruments/powersupplies/Helmholtz_power_supplies.png
    :align: right

    The powersupplies for the x, z, and y stages.

The voltage settings for the following scenarios are:

**Chiba B-Field**:

- X-stage: 0.0V

- Y-stage: 0.0V

- Z-stage: 0.0V

**South Pole B-Field**:

- X-stage: 5.5V

- Y-stage: 9.5V

- Z-stage: 0.0V

**Chiba B-Field**:

- X-stage: 18.0V

- Y-stage: 12.0V

- Z-stage: 0.0V