Optical boundary reconstruction of tokamak plasmas for feedback control of plasma position and shape

TitleOptical boundary reconstruction of tokamak plasmas for feedback control of plasma position and shape
Publication TypeJournal Article
Year of Publication2010
AuthorsG. Hommen, M. de Baar, P. Nuij, G. McArdle, R. Akers, M. Steinbuch
JournalReview of Scientific Instruments
Volume81
Number11
Pagination13
Date PublishedNov
Type of ArticleArticle
ISBN Number0034-6748
Accession NumberISI:000285006500015
KeywordsASDEX, CONFINEMENT, EDGE, H-mode, MAST
Abstract

A new diagnostic is developed to reconstruct the plasma boundary using visible wavelength images. Exploiting the plasma's edge localized and toroidally symmetric emission profile, a new coordinate transform is presented to reconstruct the plasma boundary from a poloidal view image. The plasma boundary reconstruction is implemented in MATLAB and applied to camera images of Mega-Ampere Spherical Tokamak discharges. The optically reconstructed plasma boundaries are compared to magnetic reconstructions from the offline reconstruction code EFIT, showing very good qualitative and quantitative agreement. Average errors are within 2 cm and correlation is high. In the current software implementation, plasma boundary reconstruction from a single image takes 3 ms. The applicability and system requirements of the new optical boundary reconstruction, called OFIT, for use in both feedback control of plasma position and shape and in offline reconstruction tools are discussed. (C) 2010 American Institute of Physics. [doi:10.1063/1.3499219]

URL<Go to ISI>://000285006500015
Division

Fusion Physics

PID

b2621ad816ab5a99b4a34f0b6fb88c71

Alternate TitleRev. Sci. Instrum.

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