Collisional dependence of Alfven mode saturation in tokamaks

Dataset · Thu Dec 01 00:00:00 EST 2016

DOI:https://doi.org/10.11578/1367170· OSTI ID:1367170

Zhou, M. ^[1]; White, R.  ^[1]

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1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Saturation of \alfven modes driven unstable by a distribution of high energy particles as a function of collisionality is investigated with a guiding center code, using numerical eigenfunctions produced by linear theory and numerical high energy particle distributions. The most important resonance is found and it is shown that when the resonance domain is bounded, not allowing particles to collisionlessly escape, the saturation amplitude is given by the balance of the resonance mixing time with the time for nearby particles to collisionally diffuse across the resonance width. Saturation amplitudes are in agreement with theoretical predictions as long as the mode amplitude is not so large that it produces stochastic loss from the resonance domain.

• Research Organization: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Fusion Energy Sciences (FES)
• DOE Contract Number: AC02-09CH11466
• OSTI ID: 1367170
• Resource Relation: Related Information: Plasma Physics and Controlled Fusion, vol. 58 p. 125006, (December 2016)
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
TAE modes Saturation Tokamaks