Fluid Model Analysis of the Distribution of the Negative Ion Density before the Extraction from a Tandem Type of a Plasma Source

Journal Article · Mon Sep 26 00:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3637374· OSTI ID:21611695

St Lishev, Stiliyan; Shivarova, Antonia P ^[1]; Tarnev, Khristo Ts ^[2]

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1. Faculty of Physics, Sofia University, BG-1164 Sofia (Bulgaria)
2. Department of Applied Physics, Technical University-Sofia, BG-1000 Sofia (Bulgaria)

Unified description of the expansion (through a magnetic filter) and extraction regions, including also the driver, of volume-production based sources of negative hydrogen ions is presented in the study. The model is one-dimensional, developed within the fluid plasma theory. It covers description of both the second chamber of the tandem sources and a single inductively-driven (with a planar coil) discharge of a matrix source. Four parameters have been varied in the analysis of the results: type, position and magnitude of the filter field and rf power applied for the discharge maintenance. The obtained results for the spatial distribution of the plasma parameters as well as for the electronegativity, for the negative ion beam current and its ratio to the electron current at the position of the extraction are discussed regarding optimum conditions for the source operation. The conclusion is that a magnetic field extended over a large region till the extraction favors locality in the discharge behavior and, respectively, the local production of the negative ions. This leads to high density of the extracted negative ion beam current at reasonable values of its ratio to the electron current density.

• OSTI ID: 21611695
• Journal Information: AIP Conference Proceedings, Vol. 1390, Issue 1; Conference: 2. international symposium on negative ions, beams and sources, Takayama City (Japan), 16-19 Nov 2010; Other Information: DOI: 10.1063/1.3637374; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANIONS
BEAM CURRENTS
BEAM EXTRACTION
BEAM TRANSPORT
CURRENT DENSITY
ELECTRONEGATIVITY
ELECTRONS
HYDROGEN IONS
ION BEAMS
MAGNETIC FIELDS
MAGNETIC FILTERS
PLASMA
PLASMA EXPANSION
PLASMA FLUID EQUATIONS
PLASMA HEATING
SPATIAL DISTRIBUTION
BEAMS
BOLTZMANN-VLASOV EQUATION
CHARGED PARTICLES
CURRENTS
DIFFERENTIAL EQUATIONS
DISTRIBUTION
ELEMENTARY PARTICLES
EQUATIONS
EXPANSION
FERMIONS
FILTERS
HEATING
IONS
LEPTONS
PARTIAL DIFFERENTIAL EQUATIONS