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 journalArticle

    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

    Fingerprint

    Antenna phased arrays
    Wave effects
    antennas
    Launching
    phased arrays
    launching
    Receiving antennas
    standing waves
    Test facilities
    forming techniques
    Experiments
    Microwaves
    Antennas
    Derivatives
    beamforming
    directivity
    test facilities
    reflectors
    Metals
    microwaves

    All Science Journal Classification (ASJC) codes

    • Instrumentation

    Cite this

    Idei, H., Nagata, K., Mishra, K., Yamamoto, M. K., Itado, T., Akimoto, R., ... Zushi, H. (2014). Adaptive array technique for differential-phase reflectometry in QUEST. Review of Scientific Instruments, 85(11), [11D842]. https://doi.org/10.1063/1.4891710

    Adaptive array technique for differential-phase reflectometry in QUEST. / Idei, H.; Nagata, K.; Mishra, K.; Yamamoto, M. K.; Itado, T.; Akimoto, R.; Hanada, K.; Zushi, H.

    In: Review of Scientific Instruments, Vol. 85, No. 11, 11D842, 01.11.2014.

    Research output: Contribution to journalArticle

    Idei, H, Nagata, K, Mishra, K, Yamamoto, MK, Itado, T, Akimoto, R, Hanada, K & Zushi, H 2014, 'Adaptive array technique for differential-phase reflectometry in QUEST', Review of Scientific Instruments, vol. 85, no. 11, 11D842. https://doi.org/10.1063/1.4891710
    Idei, H. ; Nagata, K. ; Mishra, K. ; Yamamoto, M. K. ; Itado, T. ; Akimoto, R. ; Hanada, K. ; Zushi, H. / Adaptive array technique for differential-phase reflectometry in QUEST. In: Review of Scientific Instruments. 2014 ; Vol. 85, No. 11.
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    AU - Itado, T.

    AU - Akimoto, R.

    AU - Hanada, K.

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