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Title: Microturbulence study of the isotope effect

The influence of the ion mass on the dynamics of magnetized plasmas is an important challenge in fusion research. The discrepancies between the improvement of the magnetic confinement with the ion mass in tokamak experiments and diffusive turbulent transport predictions have remained unexplained for several decades. We refer to this phenomenon as the isotope effect. In this paper, we study this effect with gyrokinetic theory using the GENE code. We find several sets of plasma parameters that correspond to low wavenumber turbulence for which the isotope effect is present, although the intensity is smaller than the experimental observations. We also relate these results to the zonal flow intensity of the system, which is characterized by the average shear flow rate.
Authors:
; ;  [1] ;  [1] ;  [2] ;  [3]
  1. Max-Planck-Institut für Plasmaphysik, Boltzmannstrasse 2, 85748 Garching (Germany)
  2. (United States)
  3. Laboratorio Nacional de Fusion, CIEMAT, 28040 Madrid (Spain)
Publication Date:
OSTI Identifier:
22407991
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 1; Other Information: (c) 2015 EURATOM; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; DYNAMICS; EXPERIMENTAL DATA; FLOW RATE; MAGNETIC CONFINEMENT; MASS; PLASMA; SHEAR; TOKAMAK DEVICES; TRANSPORT; TURBULENCE