Abstract
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 language | English |
|---|---|
| Pages (from-to) | 283-285 |
| Number of pages | 3 |
| Journal | Fusion Science and Technology |
| Volume | 51 |
| Issue number | 2T |
| Publication status | Published - 1 Feb 2007 |
Keywords
- beam emission
- beam attenuation
- quartz optical fiber
- heavy ions
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Ikeda, K., Osakabe, M., Whiteford, A., Takeiri, Y., Kaneko, O., Kato, T., ... grp, LHD. E. (2007). Beam emission diagnostic for estimating neutral beam attenuation. Fusion Science and Technology, 51(2T), 283-285.