Plasma Shape Control on the National Spherical Torus Experiment (NSTX) using Real-time Equilibrium Reconstruction
- Gates, D.A.
- Ferron, J.R.
- Bell, M.
- Gibney, T.
- Johnson, R.
- Marsala, R.J.
- Mastrovito, D.
- Menard, J.E.
- Mueller, D.
- Penaflor, B.
- Sabbagh, S.A.
- Stevenson, T.
Publication date
April 2005
DOI Publisher
Princeton University. Plasma Physics Laboratory. Citation count (estimate)
1Abstract
Plasma shape control using real-time equilibrium reconstruction has been implemented on the National Spherical Torus Experiment (NSTX). The rtEFIT code originally developed for use on DIII-D was adapted for use on NSTX. The real-time equilibria provide calculations of the flux at points on the plasma boundary, which is used as input to a shape control algorithm known as isoflux control. The flux at the desired boundary location is compared to a reference flux value, and this flux error is used as the basic feedback quantity for the poloidal-field coils on NSTX. The hardware that comprises the control system is described, as well as the software infrastructure. Examples of precise boundary control are also presented
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