skip to main content

Title: Development of electron cyclotron emission imaging system on the HL-2A tokamak

A 2D electron cyclotron emission imaging (ECEI) system has been developed for measurement of electron temperature fluctuations in the HL-2A tokamak. It is comprised of a front-end 24 channel heterodyne imaging array with a tunable RF range spanning 75–110 GHz, and a set of back-end ECEI electronics that together generate 24 × 8 = 192 channel images of the 2nd harmonic X-mode electron cyclotron emission from the HL-2A plasma. The simulated performance of the local oscillator (LO) optics and radio frequency (RF) optics is presented, together with the laboratory characterization results. The Gaussian beams from the LO optics are observed to properly cover the entire detector array. The ECE signals from the plasma are mixed with the LO signal in the array box, then delivered to the electronics system by low-loss microwave cables, and finally to the digitizers. The ECEI system can achieve temporal resolutions of ∼μs, and spatial resolutions of 1 cm (radially) and 2 cm (poloidally)
Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;  [1] ; ; ; ; ;  [2]
  1. Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041 (China)
  2. Department of Electrical and Computer Engineering, University of California at Davis, Davis, California 95616 (United States)
Publication Date:
OSTI Identifier:
22220324
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 84; Journal Issue: 11; Other Information: (c) 2013 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; BEAMS; CYCLOTRON RESONANCE; CYCLOTRONS; DIGITIZERS; ELECTRON TEMPERATURE; ELECTRONS; EMISSION; FLUCTUATIONS; GHZ RANGE; HL-2A TOKAMAK; ION TEMPERATURE; MAGNETOHYDRODYNAMICS; MICROWAVE RADIATION; OSCILLATORS; PLASMA DIAGNOSTICS; PLASMA INSTABILITY; RADIOWAVE RADIATION; SIGNALS; SPATIAL RESOLUTION