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Title: Adaptive array technique for differential-phase reflectometry in QUEST

A Phased Array Antenna (PAA) was considered as launching and receiving antennae in reflectometry to attain good directivity in its applied microwave range. A well-focused beam was obtained in a launching antenna application, and differential-phase evolution was properly measured by using a metal reflector plate in the proof-of-principle experiment at low power test facilities. Differential-phase evolution was also evaluated by using the PAA in the Q-shu University Experiment with Steady State Spherical Tokamak (QUEST). A beam-forming technique was applied in receiving phased-array antenna measurements. In the QUEST device that should be considered as a large oversized cavity, standing wave effect was significantly observed with perturbed phase evolution. A new approach using derivative of measured field on propagating wavenumber was proposed to eliminate the standing wave effect.
Authors:
; ;  [1] ; ; ; ;  [2] ;  [3]
  1. Research Institute for Applied Mechanics, Kyushu Univ., Kasuga, 816-8560 Japan (Japan)
  2. Interdisciplinary Grad. School of Eng. Sci., Kyushu Univ., Kasuga, 816-8580 Japan (Japan)
  3. Research Institute for Sustainable Humanosphere, Kyoto Univ., Uji, 611-0011 Japan (Japan)
Publication Date:
OSTI Identifier:
22308928
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; ANTENNAS; BEAM PROFILES; EVALUATION; MEASURING INSTRUMENTS; MICROWAVE RADIATION; REFLECTION; STANDING WAVES; TEST FACILITIES; TESTING; TOKAMAK DEVICES