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The velocity distribution of neon atoms recycling at a carbon limiter has been determined from the Doppler broadening of a NeI line at a wavelength of 585.248 nm. The measured velocity distribution matches well the radial intensity distribution from line emission of neon atoms released from the limiter. The velocity distribution of two components, thermally desorbed particles at 0.3 eV and fast particles with an averaged energy of 15 eV. With increasing line averaged central electron density (corresponding to a decreasing edge temperature), the fraction of fast particles increases up to 50 %, while the average velocity of fast particles decreases, as would be expected from the reflection process. The particle reflection of neon projectiles at the carbon surface is modelled using the TRIM and EIRENE codes, but the calculated velocity distribution shows some discrepancy.

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Authors: UNTERBERG B ET AL., Forschungszentrum Jülich GmbH (KFA) (DE)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vols. 220-222 (1995) pp. 462-466
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