TITLE

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

AUTHOR(S)
Lee, Jungpyo; Bonoli, Paul; Wright, John
PUB. DATE
January 2011
SOURCE
Physics of Plasmas;Jan2011, Vol. 18 Issue 1, p012503
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
57679412

 

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