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Title: Mode conversion and absorption of fast waves at high ion cyclotron harmonics in inhomogeneous magnetic fields

The propagation and absorption of high harmonic fast waves is of interest for non-inductive current drives in fusion experiments. The fast wave can be coupled with the ion Bernstein wave that propagates in the high magnetic field side of an ion cyclotron harmonic resonance layer. This coupling and the absorption are analyzed using the hot plasma dispersion relation and a wave equation that was converted from an approximate dispersion relation for the case where λ{sub i}=k{sub ⊥}{sup 2}ρ{sub i}{sup 2}/2≳1 (where k{sub ⊥} is the perpendicular wave number and ρ{sub i} is the ion Larmor radius). It is found that both reflection and conversion may occur near the harmonic resonance layer but that they decrease rapidly, giving rise to a sharp increase in the absorption as the parallel wave number increases.
Authors:
 [1] ;  [2]
  1. Department of Physics, Kyonggi University, Suwon, Kyonggi-Do 443-760 (Korea, Republic of)
  2. National Fusion Research Institute, Daejeon 305-806 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22252996
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 4; Other Information: (c) 2014 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; ABSORPTION; BERNSTEIN MODE; CYCLOTRON HARMONICS; CYCLOTRONS; DISPERSION RELATIONS; HOT PLASMA; LARMOR RADIUS; MAGNETIC FIELDS; MODE CONVERSION; NON-INDUCTIVE CURRENT DRIVE; PLASMA WAVES; RESONANCE; WAVE EQUATIONS