Implementation of BN Control in the National Spherical Torus Experiment
Authors: S. Gerhardt, D. Mastrovito, M.G. Bell, M. Cropper, D.A. Gates, E. Kolemen, J. Lawson, B. Marsala, J.E. Menard, D. Mueller and T. Stevenson
Abstract:
We have designed and constructed a system for control of the normalized B in the
National Spherical Torus Experiment [M. Ono, et al., Nuclear Fusion 40, 557 (2000)]. A
PID operator is applied to the difference between the present value of B N (from realtime
equilibrium reconstruction) and a time-dependent request, in order to calculate the
required injected power. This injected power request is then turned into modulations of
the neutral beams. The details of this algorithm are described, including the techniques
used to develop the appropriate control gains. Example uses of the system are shown.
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Submitted to: Fusion Science and Technology, (October 2010)
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Download PPPL-4810 (pdf 283 KB 26 pp)
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