Nonlinear Splitting of Fast Particle Driven Waves in a Plasma: Observation and Theory

Journal Article · Mon Nov 30 23:00:00 EST 1998 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.81.5564· OSTI ID:675134

Fasoli, A; Borba, D; Heeter, R F; Sharapov, S E ^[1]; Fasoli, A ^[2]; Breizman, B N; Pekker, M S ^[3]; Borba, D ^[4]; Heeter, R F ^[5]

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1. JET Joint Undertaking, Abingdon, Oxon OX14 3EA (United Kingdom)
2. Plasma Science and Fusion Center, MIT, Cambridge, Massachusetts 02139 (United States)
3. Institute for Fusion Studies, UT Austin, Austin, Texas 78712 (United States)
4. Association EURATOM/IST, Avenue Rovisto Pais, 1096 Lisbon (Portugal)
5. Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543 (United States)

The measured spectra of fast particle driven Alfv{acute e}n eigenmodes in the JET tokamak plasma are interpreted on the basis of a nonlinear model of near-threshold kinetic instabilities. The observed mode splitting is a manifestation of the general nonlinear phenomena due to the combination of resonant wave-particle interaction and collisionlike relaxation of the resonant particles. The instability growth rate and the effective collision frequency of the resonant particles are determined. {copyright} {ital 1998} {ital The American Physical Society }

• Research Organization: Univesity of Texas
• DOE Contract Number: FG03-96ER54346
• OSTI ID: 675134
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 25 Vol. 81; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALFVEN WAVES
EIGENSTATES
INSTABILITY GROWTH RATES
PLASMA INSTABILITY
PLASMA SIMULATION
TOKAMAK DEVICES