Saturation of Alfvén modes in tokamaks. (20th September 2016)

• Record Type: Journal Article
• Authors: White, Roscoe; Gorelenkov, Nikolai; Gorelenkova, Marina; Podesta, Mario; Ethier, Stephane; Chen, Yang
• Is Part Of: Plasma physics and controlled fusion. Volume 58:Number 11(2016:Nov.)
• Publication Date: 2016-09-20
• Subjects: Alfven modes -- tokamaks -- saturation -- beam particles; Plasma (Ionized gases) -- Periodicals; Controlled fusion -- Periodicals; 530.44
• DOI: 10.1088/0741-3335/58/11/115007
• Languages: English
• ISSNs: 0741-3335

Abstract

Abstract: Growth of Alfvén modes driven unstable by a distribution of high energy particles up to saturation is investigated with a guiding center code, using numerical eigenfunctions produced by linear theory and a numerical high energy particle distribution, in order to make detailed comparison with experiment and with models for saturation amplitudes and the modification of beam profiles. Two innovations are introduced. First, a very noise free means of obtaining the mode-particle energy and momentum transfer is introduced, and secondly, a spline representation of the actual beam particle distribution is used.