Adaptive array technique for differential-phase reflectometry in QUEST

H. Idei, K. Nagata, K. Mishra, M. K. Yamamoto, T. Itado, R. Akimoto, K. Hanada, H. Zushi

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    4 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Article number11D842
    JournalReview of Scientific Instruments
    Volume85
    Issue number11
    DOIs
    Publication statusPublished - Nov 1 2014

    All Science Journal Classification (ASJC) codes

    • Instrumentation

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