Journal ArticleDOI
Linear algebraic algorithms for high speed and stable reconstruction of plasma image
TLDR
The singular value and QR decompositions of the projection matrix give new types of series expansions of the plasma image and present stable and high speed imaging which might be useful for monitoring the time evolution of plasma in a fusion device with angular-limited, sparse and noisy data in projection observation.About:
This article is published in Fusion Engineering and Design.The article was published on 1997-03-01. It has received 14 citations till now. The article focuses on the topics: Algebraic Reconstruction Technique & Iterative reconstruction.read more
Citations
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Journal ArticleDOI
Soft X ray tomography during ELMs and impurity injection in JET
L. C. Ingesson,B. Alper,H. Chen,A. W. Edwards,G. C. Fehmers,Julia Fuchs,R. Giannella,Richard D. Gill,L. Lauro-Taroni,M. Romanelli +9 more
TL;DR: In this paper, a grid-based constrained optimization method that uses anisotropic smoothness on flux surfaces as regularization has been used to reconstruct very localized soft X ray emission from the wall during edge localized modes.
Journal ArticleDOI
Chapter 7: Tomography Diagnostics: Bolometry and Soft-X-Ray Detection
TL;DR: In this paper, a multichannel broadband measurement of the soft-X-ray radiation and total radiation in magnetically confined fusion plasma experiments is presented, along with the application of computed tomography methods in the mathematical reconstruction of emission profiles from multiple (approximately) line-integral measurements.
Journal ArticleDOI
Modern numerical methods for plasma tomography optimisation
Michal Odstrcil,Michal Odstrcil,Jan Mlynar,T. Odstrcil,B. Alper,Andrea Murari,Jet-Efda Contributors +6 more
TL;DR: In this article, an optimised version of robust and fast tomographic algorithm based on the Tikhonov regularisation constrained to minimum Fisher information is presented. And the resulting speed of reconstruction is compared to other referenced tomographic algorithms.
Journal ArticleDOI
Optimized tomography methods for plasma emissivity reconstruction at the ASDEX Upgrade tokamak.
TL;DR: This paper provides a detailed description of several tomography algorithms, which solve the inversion problem of Tikhonov regularization with linear computational complexity in the number of basis functions.
Journal ArticleDOI
Inversion Techniques in the Soft-X-Ray Tomography of Fusion Plasmas: Toward Real-Time Applications
TL;DR: In this contribution, the main inversion techniques used today are reviewed, with working results and challenges outlined, and special attention is given to techniques that allow for rapid tomography inversions, because of their future potential for real-time applications.
References
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Phillips–Tikhonov regularization of plasma image reconstruction with the generalized cross validation
Naofumi Iwama,Hiromasa Yoshida,Hitoshi Takimoto,Yun Shen,Shuichi Takamura,Takashige Tsukishima +5 more
TL;DR: In this article, the use of the Phillips-Tikhonov regularization is proposed for numerically stabilizing the ill-conditioned plasma image reconstructions, which leads to a linear estimator of the image intensity distribution and makes it possible to use the generalized cross validation for optimizing a regularization parameter.