Beam emission diagnostic for estimating neutral beam attenuation

K. Ikeda, M. Osakabe, A. Whiteford, Y. Takeiri, O. Kaneko, T. Kato, I. Murakami, K. Nagaoka, Y. Oka, H. Summers, K. Tsumori, LHD experiment grp

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1 Citation (Scopus)


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.
Original languageEnglish
Pages (from-to)283-285
Number of pages3
JournalFusion Science and Technology
Issue number2T
Publication statusPublished - 1 Feb 2007


  • beam emission
  • beam attenuation
  • quartz optical fiber
  • heavy ions


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