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Title: Alternative optical concept for electron cyclotron emission imaging

The implementation of advanced electron cyclotron emission imaging (ECEI) systems on tokamak experiments has revolutionized the diagnosis of magnetohydrodynamic (MHD) activities and improved our understanding of instabilities, which lead to disruptions. It is therefore desirable to have an ECEI system on the ITER tokamak. However, the large size of optical components in presently used ECEI systems have, up to now, precluded the implementation of an ECEI system on ITER. This paper describes a new optical ECEI concept that employs a single spherical mirror as the only optical component and exploits the astigmatism of such a mirror to produce an image with one-dimensional spatial resolution on the detector. Since this alternative approach would only require a thin slit as the viewing port to the plasma, it would make the implementation of an ECEI system on ITER feasible. The results obtained from proof-of-principle experiments with a 125 GHz microwave system are presented.
Authors:
 [1] ;  [2] ; ; ; ; ; ; ; ; ;  [3] ;  [4] ;  [5] ;  [6] ;  [7]
  1. Department of Physics, University of California Berkeley, Berkeley, California 94720 (United States)
  2. Department of Physics, College of William and Mary, Williamsburg, Virginia 23185 (United States)
  3. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540 (United States)
  4. Department of Physics, University of California Los Angeles, Los Angeles, California 90095 (United States)
  5. Department of Electrical Engineering, University of Stuttgart, Stuttgart (Germany)
  6. Department of Physics, Chongqing University, Chongqing 400044 (China)
  7. Ulsan National Institute of Science and Technology, Ulsan 689-798 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22308788
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 11; 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; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ELECTRON CYCLOTRON-RESONANCE; EMISSION; GHZ RANGE; IMAGES; ITER TOKAMAK; MAGNETOHYDRODYNAMICS; MICROWAVE RADIATION; MIRRORS; PLASMA; PLASMA INSTABILITY; SPATIAL RESOLUTION; SPHERICAL CONFIGURATION