Articolo in rivista, 2013, ENG, 10.1063/1.4792764

Plasma grid shape and size effects on the extraction of negative ions

Taccogna, F. and Minelli, P. and Capitelli, M. and Longo, S. and Schneider, R.

Istituto di Metodologie Inorganiche e dei Plasmi (IMIP); Institute of Physics, Ernst-Moritz Arndt University, Greifswald

By means of a self-consistent three-dimensional particle model of the source-extraction transition region of a surface-produced negative ion source, the characteristics of negative ion transport have been revealed. It is purely electrostatic and collision-induced (charge exchange with atoms) and magnetic-induced (gyration around filter field) transport contributions play no relevant role for the H- transport. In fact, the key point is the penetration of the EG field inside the source, which helps removing negative ions produced on the surface. This study suggests that the best PG shape is characterized such to allow the extraction EG field from attaching the surface from where H- are produced and that the best aperture size is directly related to this particular shape.

AIP conference proceedings 1515 , pp. 3–11

Keywords

Particle-in-Cell Model, Plasma Sheath, Surface-produced negative Ion

CNR authors

Capitelli Mario, Longo Savino, Taccogna Francesco, Minelli Pierpaolo

CNR institutes