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Updated: Jun 23, 2026

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
Published on: December 22, 2018
A digital control system for external magnetohydrodynamic modes in tokamak plasmas
J M Hanson1, A J Klein, M E Mauel
1Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA. jmh2130@columbia.edu
Abstract:
A feedback system for controlling external, long-wavelength magnetohydrodynamic activity is described. The system is comprised of a network of localized magnetic pickup and control coils driven by four independent, low-latency field-programable gate array controllers. The control algorithm incorporates digital spatial filtering to resolve low mode number activity, temporal filtering to correct for frequency-dependent amplitude and phase transfer effects in the control hardware, and a Kalman filter to distinguish the unstable plasma mode from noise.
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