Hydrogen Atomic and Molecular Emission Locations and Intensities in the LHD Edge Plasma Determined from Simultaneously Observed Polarization Spectra

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Abstract

<p>We observed polarization-resolved emission spectra of the Balmer-<i>α</i>, -<i>β</i>, and -<i>γ</i> lines of hydrogen atoms and the <i>Q </i>branches of the Fulcher-<i>α</i> band of hydrogen molecules simultaneously with six lines of sight in a poloidal cross section of the Large Helical Device (LHD). From the fit of the spectra including the line splits and their polarization dependence due to the Zeeman effect, we determined the emission locations, intensities and temperatures of the atoms and molecules. The determined emission locations of the hydrogen atoms were just outside the last closed flux surface and the intensities showed small dependence on the location. The emission locations of the molecules were rather around the divertor legs and their emission intensities showed location dependences. The determined atomic temperature was about 1 eV and the molecular rotational temperature was 0.04∼0.07 eV, both of which showed no systematic dependence on the location within the experimental accuracy.</p>

Journal

  • Plasma and Fusion Research

    Plasma and Fusion Research 10(0), 3402041-3402041, 2015

    The Japan Society of Plasma Science and Nuclear Fusion Research

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