skip to main content

DOE PAGESDOE PAGES

Title: Investigation of the validity of quasilinear theory for electron Landau damping in a tokamak using a broad-band wave effect

The quasilinear diffusion coefficient assuming a constant magnetic field along the electron orbit is widely used to describe electron Landau damping of waves in a tokamak where the magnitude of the magnetic field varies on a flux surface. To understand the impact of violating the constant magnetic field assumption, we introduce the effect of a broad-bandwidth wave spectrum which has been used in the past to validate quasilinear theory for the fast decorrelation process between resonances. By the reevaluation of the diffusion coefficient through the level of the phase integral for the tokamak geometry with the broad-band wave effect included, we identify the three acceptable errors for the use of the quasilinear diffusion coefficient.
Authors:
 [1] ;  [1] ;  [1]
  1. MIT (Massachusetts Inst. of Technology), Cambridge, MA (United States)
Publication Date:
OSTI Identifier:
1076458
Grant/Contract Number:
FC02-99ER54512
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 18; Journal Issue: 1; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
MIT (Massachusetts Inst. of Technology), Cambridge, MA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY