Linear and nonlinear dynamics of Alfven eigenmodes in tokamaks

Journal Article · Wed Feb 01 04:00:00 EST 1995 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.870968· OSTI ID:165981

Vlad, G; Kar, C; Zonca, F; Romanelli, F ^[1]

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1. Associazione Euratom-ENEA sulla Fusione, C.R.E. Frascati, C.P. 65-00044 Frascati, Rome (Italy)

Linear and nonlinear dynamics of various toroidicity induced global Alfven eigenmodes is investigated by means of an initial value numerical code. The code uses the reduced magnetohydrodynamic (MHD) model expanded to the third order in the inverse aspect ratio parameter {epsilon} ({epsilon} {equivalent_to} {ital a}/{ital R}{sub 0}, with {ital a} the minor radius of the plasma column and {ital R}{sub 0} the major radius of the vacuum chamber). Nonlinear saturation is shown to occur due to the excitation of a perturbation to the nonlinear mode structure, which dissipates energy on very short scales. In particular, the nonlinear saturation of the Toroidal Alfven Eigenmodes (TAE) and of the Resistive Periodic Shear Alfven Eigenmodes (RPSAE) due to MHD nonlinearities is investigated and compared with analytical predictions. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.

• OSTI ID: 165981
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 2 Vol. 2; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALFVEN WAVES
ASPECT RATIO
COMPUTER CODES
EIGENSTATES
MAGNETIC CONFINEMENT
MAGNETOHYDRODYNAMICS
PLASMA SIMULATION
TOKAMAK DEVICES