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

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)


    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
    Issue number11
    Publication statusPublished - Nov 1 2014

    All Science Journal Classification (ASJC) codes

    • Instrumentation


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