Gyrokinetic treatment of GAE modes in cylindrical geometry

Journal Article · Thu Nov 30 04:00:00 EST 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2404563· OSTI ID:20895136

Eremin, D ^[1]

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1. Max-Plank-Institut fuer Plasmaphysik, EUROATOM-Association, D-17491 Greifswald (Germany)

Global Alfven eigenmodes (GAEs) are investigated in cylindrical geometry both analytically and numerically. These modes are of particular importance in low-shear magnetic configurations, such as modern stellarators. Analytical treatment starts from the linearised equations of gyrokinetics and yields a generalized dispersion relation for GAE with FLR and kinetic effects taken into account, which is demonstrated to reduce to the well-known MHD counterpart in the appropriate limit. An eigenvalue code is developed to solve the dispersion relation, which is used to investigate the kinetic analogs of GAE modes in various regimes with different beta. On the other hand, GAE modes are simulated with global linear particle-in-cell (PIC) electromagnetic gyrokinetic code following self-consistent time evolution of electromagnetic fields and plasma. GAE modes are observed and their damping rate agrees with predictions made by the eigenvalue code.

• OSTI ID: 20895136
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 871; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALFVEN WAVES
CYLINDRICAL CONFIGURATION
DISPERSION RELATIONS
EIGENVALUES
ELECTROMAGNETIC FIELDS
EQUATIONS
EVOLUTION
GEOMETRY
MAGNETOHYDRODYNAMICS
PLASMA
PLASMA SIMULATION
PLASMA WAVES
STELLARATORS