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Square wave magnetic field

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Benta:

--- Quote from: David Hess on May 11, 2020, 06:33:49 pm ---This problem is the mirror of driving a capacitance, like with electrostatic deflection plates, with a square voltage; the available current limits the slew rate on each edge.

--- End quote ---

To be precise, it's the mirror of driving a capacitance with a square-wave current.

David Hess:

--- Quote from: Benta on May 11, 2020, 06:51:18 pm ---
--- Quote from: David Hess on May 11, 2020, 06:33:49 pm ---This problem is the mirror of driving a capacitance, like with electrostatic deflection plates, with a square voltage; the available current limits the slew rate on each edge.
--- End quote ---

To be precise, it's the mirror of driving a capacitance with a square-wave current.
--- End quote ---

The electrostatic field is proportional to the voltage.  The magnetic field is proportional to the current.  Driving a capacitance with a current yields a triangular rather than square electrostatic field.

The non-ideal series resistance of the inductor limits performance when driven with a voltage but not when using a current.

awallin:
maybe google for what they typically do in BEC or other atomic physics experiments where they need helmholtz coils around the experiment?

https://www.physics.utoronto.ca/~astummer/Archives/2007%20Mag-O-Matic%202/Mag-O-Matic%202.html
40-100A with rise-time of 100 us (!?) - but probably not at 100% duty cycle, just short bursts.

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