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Communication Dans Un Congrès Année : 2013

Effects due to adsorbed atoms upon angular and energy distributions of surface produced negative hydrogen ions

M. Wada
M. Bacal
  • Fonction : Auteur
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T. Kasuya
  • Fonction : Auteur
S. Kato
  • Fonction : Auteur
T. Kenmotsu
  • Fonction : Auteur
M. Sasao

Résumé

Exposure to Cs added hydrogen discharge makes surface of plasma grid of a negative hydrogen ion source covered with Cs and hydrogen. A Monte-Carlo particle simulation code ACAT was run to evaluate the effects due to adsorbed Cs and H atoms upon the angular and energy distributions of H atoms leaving the surface. Accumulation of H atoms on the surface reduces particle reflection coefficients and the mean energy of backscattered H atoms. Angular distributions of H atoms reflected from the hydrogen covered surface tend to be under-cosine at lower energies. Desorption of adsorbed H atoms is more efficient for hydrogen positive ions than for Cs positive ions at lower incident energy. At higher energy more than 100 eV, Cs ions desorb adsorbed H atoms more efficiently than hydrogen ions.
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Dates et versions

hal-02893262 , version 1 (08-07-2020)

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  • HAL Id : hal-02893262 , version 1

Citer

M. Wada, M. Bacal, T. Kasuya, S. Kato, T. Kenmotsu, et al.. Effects due to adsorbed atoms upon angular and energy distributions of surface produced negative hydrogen ions. 3RD INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2012), Sep 2012, Jyväskylä, Finland. pp.59-65. ⟨hal-02893262⟩
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