TITLE

Numerical Analysis of Electronegative Plasma near the Extraction Grid in Negative Ion Sources

AUTHOR(S)
Kuppel, S.; Matsushita, D.; Hatayama, A.; Bacal, M.
PUB. DATE
March 2009
SOURCE
AIP Conference Proceedings;3/12/2009, Vol. 1097 Issue 1, p55
SOURCE TYPE
Conference Proceeding
DOC. TYPE
Article
ABSTRACT
The effects of plasma electrode (PE) bias on the extraction process in a negative ion source are studied with a series of two-dimensional (2D) electrostatic particle simulations. Motion of charged particles in their self-consistent electric field is modeled by the Particle-In-Cell (PIC) method. The effect of a weak transverse magnetic field is also taken into account. Extracted electron current density gradually decreases as the PE bias increases, while the absolute value of PE net current density initially increases and is saturated for higher values of PE bias. The extracted negative ion current density reaches a weak peak when the PE bias approaches the bulk plasma potential (Vpf) in the case without the PE bias, but the decrease afterwards is mild. Physical mechanisms leading to these results are discussed.
ACCESSION #
37044338

 

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