About the Extraction of Surface Produced Ions in Negative Ion Sources

被引：1
|
作者：
Taccogna, Francesco [1 ]
Minelli, Pierpaolo [1 ]
Longo, Savino [1 ]
Capitelli, Mario [1 ]
机构：
[1] CNR, IMIP, I-70126 Bari, Italy
来源：
SECOND INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES | 2011年 / 1390卷
关键词：
Particle-in-Cell model; Monte Carlo Collision methodology;
D O I：
10.1063/1.3637378
中图分类号：
O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号：
070203 ; 070304 ; 081704 ; 1406 ;
摘要：
The enhancement of extracted negative ion current in cesiated sources is usually explained by the surface production of negative ions. In this contribution, the self-consistent production and transport of H- in the extraction region of a radio-frequency driven negative ion source is modelled by means of a parallel two-dimensional Particle-in-Cell/Monte Carlo Collision simulation. It is shown that the number of surface-produced negative ions extracted is regulated by a potential well developed in front of the plasma grid such that the extracted current does not proportionally increase with the flux of negative ions emitted at the surface.
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页数：9
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