Evaluation of Measurement Signal of Heavy Ion Beam Probe of Energetic-Particle Driven Geodesic Acoustic Modes

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Author(s)

    • SASAKI Makoto
    • Research Institute for Applied Mechanics, Kyushu University|Research Center for Plasma Turbulence, Kyushu University
    • ITOH Kimitaka
    • Research Center for Plasma Turbulence, Kyushu University|Institute of Science and Technology Research, Chubu University
    • KASUYA Naohiro
    • Research Institute for Applied Mechanics, Kyushu University|Research Center for Plasma Turbulence, Kyushu University
    • FUJISAWA Akihide
    • Research Institute for Applied Mechanics, Kyushu University|Research Center for Plasma Turbulence, Kyushu University
    • ITOH Sanae-I.
    • Research Institute for Applied Mechanics, Kyushu University|Research Center for Plasma Turbulence, Kyushu University

Abstract

<p>In order to observe spatial profiles of energetic particle driven modes, measurement signal of Heavy Ion Beam Probe (HIBP) is formulated theoretically, focusing on effects of the fast ion density fluctuation and attenuation of the injected beam (line-integral effect). Obtained formula is applied to the density fluctuation measurement of energetic-particle driven geodesic acoustic modes (EGAMs). Intensity of the fluctuation obtained by the HIBP can be up-down asymmetric in the poloidal cross-section due to the effect of the fast ion density fluctuation, when the electron loss cross-section of HIBP due to fast ions is comparable to that due to electrons. A possibility to measure the fast ion density by HIBP is discussed, and the experimental guideline for the specification of the resonance which drives the EGAM is presented.</p>

Journal

  • Plasma and Fusion Research

    Plasma and Fusion Research 13(0), 3403040-3403040, 2018

    The Japan Society of Plasma Science and Nuclear Fusion Research

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