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Effect of Laval Nozzle in the GAMMA 10 SMBI Experiments

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Abstract

<p>Gas fueling by supersonic molecular beam injection (SMBI) has been performed at the central-cell in GAMMA 10. The results of SMBI experiment with plenum pressure from 0.3 MPa to 2.0 MPa were obtained using a laval nozzle. The distribution of the emission intensity during SMBI was investigated by the 2-dimensional image captured by the fast camera as an index of the neutral transport. The experimental results indicates that the effect of the laval nozzle reduces the dispersion of injected hydrogen molecules in the peripheral region. In this paper, we also studied the line density at the central-cell (NLcc) and Hα emission intensity during SMBI. Comparison between SMBI and conventional gas puffing is also discussed from the view point of the fueling efficiency.</p>

Journal

  • Plasma and Fusion Research

    Plasma and Fusion Research 11 (0), 2402053-2402053, 2016

    The Japan Society of Plasma Science and Nuclear Fusion Research

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