Excitation of Geodesic Acoustic Modes by External Fields

K. Hallatschek, G. R. McKee

2012 · Physical Review Letters · vol. 109 · no. 24 · American Physical Society (APS) · 10.1103/PhysRevLett.109.245001

Abstract

It is planned to use external magnetic perturbations at acoustic frequencies at the DIII-D tokamak to attempt to drive geodesic acoustic modes (GAM) to modify the turbulent transport. We show that this might not only be possible--despite the well-known electrostatic nature of the GAMs--but might be a viable and efficient method to generate GAMs in magnetically confined plasmas, by developing an elegant analytic method which allows us to couple numerical dynamic equilibrium calculations with massively parallel non-Boussinesq turbulence code runs and yields practical estimates of the effectivity of the method.

@article{Hallatschek_2012,
 title={Excitation of Geodesic Acoustic Modes by External Fields},
 volume={109},
 ISSN={1079-7114},
 url={http://dx.doi.org/10.1103/PhysRevLett.109.245001},
 DOI={10.1103/physrevlett.109.245001},
 number={24},
 journal={Physical Review Letters},
 publisher={American Physical Society (APS)},
 author={Hallatschek, K. and McKee, G. R.},
 year={2012},
 month=dec }