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Debye Length in a Neutral‐beam‐heated Plasma
Author(s) -
Wolle B.
Publication year - 1997
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.2150370403
Subject(s) - debye length , plasma , debye , physics , atomic physics , beam (structure) , electromagnetic shielding , thermal velocity , debye sheath , length scale , poisson's equation , computational physics , flow velocity , mechanics , optics , condensed matter physics , quantum mechanics , flow (mathematics)
The scale length for an effective shielding of a charged particle in a plasma is the Debye length, which is for Maxwellian velocity distributions determined by the ratio of the temperature to the density. However, fusion plasmas heated by neutral‐beam injection (NBI) exhibit highly non‐Maxwellian slowing‐down velocity distributions. In this case, the evaluation of the characteristic shielding distance from these velocity distributions requires the solution of Fokker‐Planck‐Poisson equations. In this paper, the effect of NBI slowing‐down velocity distributions on the shielding distance are discussed. Analytic expressions for the Debye length of a neutral‐beam‐heated plasma are given. The results are compared to the Maxwellian case.