Investigation of the validity of quasilinear theory for electron Landau damping in a tokamak using a broad-band wave effect
- MIT (Massachusetts Inst. of Technology), Cambridge, MA (United States)
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.
- Research Organization:
- MIT (Massachusetts Inst. of Technology), Cambridge, MA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- FC02-99ER54512
- OSTI ID:
- 1076458
- Journal Information:
- Physics of Plasmas, Vol. 18, Issue 1; ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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