期刊
PHYSICS OF PLASMAS
卷 26, 期 8, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.5098982
关键词
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资金
- Euratom research and training programme [633053]
The equations describing the continuous spectrum of shear Alfven and ion sound waves propagating along magnetic field lines are introduced and solved in the ballooning space for general geometry in the ideal MHD limit. This approach is equivalent to earlier analyses by Chu et al. 1992 [Phys. Fluids B 4, 3713 (1992)], but the present formulation in the ballooning space allows us to readily extend it to include gyrokinetic and three-dimensional equilibrium effects. In particular, following Chen and Zonca 2017 [Phys. Plasmas 24, 072511 (2017)], the MHD limit is adopted to illustrate the general methodology in a simple case, and the equations are solved within the framework of Floquet and Hill's equation theory. The connection of shear Alfven and ion sound wave continuum structures to the generalized plasma inertia in the general fishbonelike dispersion relation is also illustrated and discussed. As an application, the continuous frequency spectrum is calculated for a reference equilibrium of the Divertor Tokamak Test facility. The results are compared with those obtained by the MARS code adopting the standard methodology, demonstrating excellent agreement.
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