skip to main content

Title: Parallel momentum input by tangential neutral beam injections in stellarator and heliotron plasmas

The configuration dependence of parallel momentum inputs to target plasma particle species by tangentially injected neutral beams is investigated in non-axisymmetric stellarator/heliotron model magnetic fields by assuming the existence of magnetic flux-surfaces. In parallel friction integrals of the full Rosenbluth-MacDonald-Judd collision operator in thermal particles' kinetic equations, numerically obtained eigenfunctions are used for excluding trapped fast ions that cannot contribute to the friction integrals. It is found that the momentum inputs to thermal ions strongly depend on magnetic field strength modulations on the flux-surfaces, while the input to electrons is insensitive to the modulation. In future plasma flow studies requiring flow calculations of all particle species in more general non-symmetric toroidal configurations, the eigenfunction method investigated here will be useful.
Authors:
 [1] ; ;  [2]
  1. National Institute for Fusion Science, Toki 509-5292 (Japan)
  2. Graduate School of Energy Science, Kyoto University, Uji 611-0011 (Japan)
Publication Date:
OSTI Identifier:
22490162
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AXIAL SYMMETRY; BEAM INJECTION; COLLISIONS; EIGENFUNCTIONS; ELECTRONS; FRICTION; HELIOTRON; INTEGRALS; KINETIC EQUATIONS; MAGNETIC FIELDS; MAGNETIC FLUX; MAGNETIC SURFACES; MODULATION; NEUTRAL PARTICLES; PARTICLE BEAMS; PLASMA; SPACE DEPENDENCE; STELLARATORS; TOROIDAL CONFIGURATION; TRAPPING