A digital control system for external magnetohydrodynamic modes in tokamak plasmas.
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.
Hanson
J M
JM
Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA. jmh2130@columbia.edu
Klein
A J
AJ
Mauel
M E
ME
Maurer
D A
DA
Navratil
G A
GA
Pedersen
T Sunn
TS