TEMPEST simulations of collisionless damping of the geodesic-acoustic mode in edge-plasma pedestals

The fully nonlinear (full-f) four-dimensional TEMPEST gyrokinetic continuum code correctly produces the frequency and collisionless damping of geodesic-acoustic modes (GAMs) and zonal flow, with fully nonlinear Boltzmann electrons for the inverse aspect ratio scan and the tokamak safety factor q sca...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Veröffentlicht in:	Physical review letters 2008-05, Vol.100 (21), p.215001-215001, Article 215001
Hauptverfasser:	Xu, X Q, Xiong, Z, Gao, Z, Nevins, W M, McKee, G R
Format:	Artikel
Sprache:	eng
Schlagworte:	70 PLASMA PHYSICS AND FUSION TECHNOLOGY ASPECT RATIO COMPUTERIZED SIMULATION ELECTRONS EMISSION SPECTROSCOPY FOUR-DIMENSIONAL CALCULATIONS HOMOGENEOUS PLASMA NONLINEAR PROBLEMS TEMPERATURE GRADIENTS TOKAMAK DEVICES
Online-Zugang:	Volltext
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	The fully nonlinear (full-f) four-dimensional TEMPEST gyrokinetic continuum code correctly produces the frequency and collisionless damping of geodesic-acoustic modes (GAMs) and zonal flow, with fully nonlinear Boltzmann electrons for the inverse aspect ratio scan and the tokamak safety factor q scan in homogeneous plasmas. TEMPEST simulations show that the GAMs exist in the edge pedestal for steep density and temperature gradients in the form of outgoing waves. The enhanced GAM damping may explain experimental beam emission spectroscopy measurements on the edge q scaling of the GAM amplitude.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/physrevlett.100.215001