Published November 2014 | Version v1
Journal article

Plasma diagnostics at Aditya Tokamak by two views visible light tomography

  • 1. Nuclear Engineering and Technology Programme, Indian Institute of Technology, Kanpur (India)
  • 2. Department of Mechanical Engineering, Indian Institute of Technology, Kanpur (India)
  • 3. Institute for Plasma Research (India)

Description

Graphical abstract: - Highlights: • Improved algorithm works equally well for central as well as for peripherical plasma regions. • Entropy optimized smoothening parameters eliminate user dependencies. • Real time fusion grade plasma diagnostics images. - Abstract: This visible light computerized tomography exercise is a part of a project to establish an auxiliary imaging method to assist other imaging facilities at the Institute of Plasma Research (IPR), India. Space constraints around Aditya Tokamak allow only two orthogonal ports. Each port has one detector array (64 sensors) sensitive to the visual spectrum emitted by Hα emission. The objective here is to report the developments on limited view tomography for hot plasma imaging. Spatially filtered entropy maximization algorithm with non-uniform discretization grids is employed. Estimation of unique kernel smoothening parameters (mask size and exponent factor) depends on entropy function and projection data. It removes requirement of any arbitrary/user-based decision for choosing a regularization factor thus minimizes the chance for biasedness or errors. Synthetic projection data is used to analyse the performance of this modification. The error band in the process of recovery remains under acceptable level (less than 15%) irrespective of the origin of the emissions from the core. Reconstructed hot plasma images/profiles from Aditya Tokamak are shown. These profiles may improve the current understanding about (a) plasma–wall interaction or edge plasma turbulence, (b) control and generation of plasma and (c) correlations between theoretical and engineering advancements in Tokamak reactors

Availability note (English)

Available from http://dx.doi.org/10.1016/j.fusengdes.2014.07.003

Additional details

Identifiers

DOI
10.1016/j.fusengdes.2014.07.003;
PII
S0920-3796(14)00453-0;

Publishing Information

Journal Title
Fusion Engineering and Design
Journal Volume
89
Journal Issue
11
Journal Page Range
p. 2659-2665
ISSN
0920-3796
CODEN
FEDEEE

Optional Information

Copyright
Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.