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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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