2D Model of a Tandem Plasma Source: The Role of the Transport Processes
- Faculty of Physics, Sofia University, BG-1164 Sofia (Bulgaria)
- Department of Applied Physics, Technical University-Sofia, BG-1000 Sofia (Bulgaria)
A 2D fluid-plasma model of a tandem two-chamber plasma source operating in hydrogen gas is presented in the study. The configuration of the source is of the type of the inductively-driven sources developed for neutral beam injection heating of fusion plasmas: the rf power deposition is in the first smaller-radius chamber of the source and the second bigger-radius chamber is a volume for plasma expansion from the driver. Plasma maintenance in the source governed by transport processes--charged-particle and electron-energy fluxes--is the main conclusion stemming from the results. Moreover, the metal walls of the source and its different dimensions in the longitudinal and transverse directions determine a regime of a rf discharge characterized by a dc current in the source: electrons and ions flowing in different directions determine a solenoidal current in the discharge. This is accompanied by a strong drop of electron temperature, charged-particle and hydrogen-atom densities and plasma potential at the transition between the two chambers of the source. In general, the results from the model lead to the conclusion that analysis of the transport processes should be in the basis of the optimization of the tandem-plasma-source operation.
- OSTI ID:
- 21269092
- Journal Information:
- AIP Conference Proceedings, Vol. 1097, Issue 1; Conference: 1. international symposium on negative ions, beams and sources, Aix-en-Provence (France), 9-12 Sep 2008; Other Information: DOI: 10.1063/1.3112506; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BEAM INJECTION HEATING
COMPUTERIZED SIMULATION
ELECTRIC DISCHARGES
ELECTRON TEMPERATURE
ELECTRONS
HYDROGEN
IONS
MATHEMATICAL MODELS
OPTIMIZATION
PLASMA
PLASMA BEAM INJECTION
PLASMA EXPANSION
PLASMA POTENTIAL
PLASMA PRODUCTION
PLASMA SIMULATION
RADIATION TRANSPORT
TWO-DIMENSIONAL CALCULATIONS