Spatiotemporal Structure of Hα Emission from the Detached Plasma in GAMMA 10/PDX

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<p>High-speed camera measurement was performed for analyses of detached plasma fluctuation in the GAMMA 10/PDX tandem mirror device. Significant spectral peaks at frequencies of 1.5 and 3 kHz were observed to have several local maxima along the vertical, near the entrance of the V-shaped target. Wavelet analysis indicated that 1.5- and 3-kHz fluctuations became non-simultaneously strong. Their phase relationships demonstrated inversion-symmetric and symmetric features with respect to the midplane. Such spectral patterns were interpreted as the line-integral of odd- and even-mode structures. It is suspected that the vertical edge part was due to radially elongated structures with an azimuthal phase shift.</p>

Journal

  • Plasma and Fusion Research

    Plasma and Fusion Research 14 (0), 2402036-2402036, 2019-02-12

    The Japan Society of Plasma Science and Nuclear Fusion Research

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