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Updated: Mar 3, 2026

Optimization, Test and Diagnostics of Miniaturized Hall Thrusters
Published on: February 16, 2019
Simultaneous feedback control of plasma rotation and stored energy on NSTX-U using neoclassical toroidal viscosity
I R Goumiri1, C W Rowley2, S A Sabbagh3
1Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA.
Abstract:
A model-based feedback system is presented enabling the simultaneous control of the stored energy through β and the toroidal rotation profile of the plasma in National Spherical Torus eXperiment Upgrade device. Actuation is obtained using the momentum from six injected neutral beams and the neoclassical toroidal viscosity generated by applying three-dimensional magnetic fields. Based on a model of the momentum diffusion and torque balance, a feedback controller is designed and tested in closed-loop simulations using TRANSP, a time dependent transport analysis code, in predictive mode. Promising results for the ongoing experimental implementation of controllers are obtained.
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