Beam emission diagnostic for estimating neutral beam attenuation

Ikeda, K. and Osakabe, M. and Whiteford, A. and Takeiri, Y. and Kaneko, O. and Kato, T. and Murakami, I. and Nagaoka, K. and Oka, Y. and Summers, H. and Tsumori, K. and grp, LHD experiment (2007) Beam emission diagnostic for estimating neutral beam attenuation. Fusion Science and Technology, 51 (2T). pp. 283-285. ISSN 1536-1055

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Neutral beam attenuation has been investigated by the beam emission diagnostic system at LHD which consists of a quartz optical fiber, leading to a spectrometer and an ICCD detector. The spectral resolution and the reciprocal dispersion are 0.21 nm and 1.4 nm/mm, respectively. The behavior of the beam-stopping cross-section derived from the beam emission is consistent with that of the cross-section from the Atomic Data and Analysis Structure (ADAS) database. The intensity of the beam emission decreases with increasing stopping cross-section from the use of heavy ions in a discharge. We have also observed that the measured cross-section of the hydrogen is larger than that of the ADAS calculation.