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

Journal Article · Thu Mar 12 04:00:00 EDT 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3112549· OSTI ID:21269135

Kuppel, S; Matsushita, D; Hatayama, A ^[1]; Bacal, M ^[2]

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1. Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, 223-8522 Yokohama (Japan)
2. Laboratoire de Physique et Technologie des Plasmas, UMR 7648 du CNRS, Ecole Polytechnique, 91128 Palaiseau (France)

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.

• OSTI ID: 21269135
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1097; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANIONS
COMPUTERIZED SIMULATION
CURRENT DENSITY
ELECTRIC FIELDS
ELECTRONS
MAGNETIC FIELDS
NUMERICAL ANALYSIS
PLASMA
PLASMA POTENTIAL
PLASMA PRODUCTION
TWO-DIMENSIONAL CALCULATIONS