Plasma and Fusion Research

Volume 6, 2402041 (2011)

Regular Articles

Soft X-Ray Imaging Design and Analysis Methods on DIII-D

Morgan W. SHAFER, Devon J. BATTAGLIA, Ezekial A. UNTERBERG, John M. CANIK, Todd E. EVANS¹⁾, Jeffrey H. HARRIS and Steven J. MEITNER

: Oak Ridge National Laboratory, Oak Ridge, TN, USA
1): General Atomics, San Diego, CA, USA

(Received 7 December 2010 / Accepted 11 February 2011 / Published 12 July 2011)

Abstract

A new tangential 2D Soft X-Ray Imaging System (SXRIS) is being designed to examine the edge magnetic island structure in the lower X-point region of DIII-D. A synthetic diagnostic calculation coupled to 3D emissivity estimates is used to generate phantom images. Phillips-Tikhonov regularization is used to invert the phantom images for comparison to the original emissivity model. Noise level, island size, and equilibrium accuracy are scanned to assess the feasibility of detecting edge island structures. Models of typical DIII-D discharges indicate integration times > 1 ms with accurate equilibrium reconstruction are needed for small island (< 3 cm) detection.

Keywords

soft X-ray, imaging, ELMs, inversion, diagnostics, resonant magnetic perturbation

DOI: 10.1585/pfr.6.2402041

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This paper may be cited as follows:

Morgan W. SHAFER, Devon J. BATTAGLIA, Ezekial A. UNTERBERG, John M. CANIK, Todd E. EVANS, Jeffrey H. HARRIS and Steven J. MEITNER, Plasma Fusion Res. 6, 2402041 (2011).