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Title: A novel electron density reconstruction method for asymmetrical toroidal plasmas

A novel reconstruction method is developed for acquiring the electron density profile from multi-channel interferometric measurements of strongly asymmetrical toroidal plasmas. It is based on a regularization technique, and a generalized cross-validation function is used to optimize the regularization parameter with the aid of singular value decomposition. The feasibility of method could be testified by simulated measurements based on a magnetic configuration of the flexible helical-axis heliotron device, Heliotron J, which has an asymmetrical poloidal cross section. And the successful reconstruction makes possible to construct a multi-channel Far-infrared laser interferometry on this device. The advantages of this method are demonstrated by comparison with a conventional method. The factors which may affect the accuracy of the results are investigated, and an error analysis is carried out. Based on the obtained results, the proposed method is highly promising for accurately reconstructing the electron density in the asymmetrical toroidal plasma.
Authors:
; ; ; ; ; ; ; ; ; ;  [1] ;  [2] ; ; ;  [3]
  1. Institute of Advanced Energy, Kyoto University, Gokasyo, Uji (Japan)
  2. National Institute for Fusion Science, Toki (Japan)
  3. Graduate School of Energy Science, Kyoto University, Uji (Japan)
Publication Date:
OSTI Identifier:
22254891
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ACCURACY; CROSS SECTIONS; DECOMPOSITION; ELECTRON DENSITY; EQUIPMENT; HELIOTRON; INTERFEROMETRY; LASERS; PLASMA; SIMULATION; VALIDATION