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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 lambda = 585.248 nm. The measured velocity distribution matches well the radial intensity distribution from line emission (NeI, lambda = 640.2 nm) of neon atoms released from the limiter. It has been found that the velocity distribution consists of two components, thermally desorbed particles at E = 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 a reflection process. It has been tried to reproduce the observed velocity distribution by modelling the particle reflection of neon projectiles at the carbon surface with the help of the TRIM and EIRENE codes. The calculated velocity distribution, however, shows significantly less fast particles than the measured one.

Additional information

Authors: UNTERBERG B ET AL., Forschungszentrum Jülich GmbH (KFA) (DE)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 220-222 (1995) pp. 462-466
Record Number: 199510758 / Last updated on: 1995-07-12
Original language: en
Available languages: en