Geodesic Acoustic Modes and Alfvén Continuum in Plasma Columns with Rotation

• Grant number: 12/22830-2
• Support type: Scholarships in Brazil - Doctorate
• Effective date (Start): March 01, 2013
• Effective date (End): June 30, 2017
• Field of knowledge: Physical Sciences and Mathematics - Physics - Physics of Fluids, Plasma Physics and Electrical Discharge
• Principal researcher: Ricardo Magnus Osório Galvão
• Grantee: Vinícius Njaim Duarte
• Home Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated research grant: 11/50773-0 - Center of excellence in physics and applications of plasmas, AP.TEM
• Associated scholarship(s): 14/03289-4 - Quasilinear theory of energetic particles interaction with toroidicity-induced Alfvén eigenmodes, BE.EP.DR

Abstract

In the context of the current research in controlled nuclear fusion, mechanisms that allow the existence of improved regimes of confinement (or H mode) have been drawing much attention. This kind of regime, characterized by an effective anomalous transport self-control, is triggered by mechanisms of suppression of intabilities, associated to geodesic acoustic modes (GAMs) and zonal flows (ZF). In studying these modes with realistic plasma configurations, effects due to the plasma column rotation (both poloidal and toroidal) should be taken into account. These effects, object of several studies in recent years, can substantially modify the modes frequency and besides, it may introduce new frequency branches associated to the modified dispertion relation. This project aims to study the column rotation effects on GAMs, ZF and the Alfvén Continuum. The latter may have a frequency coinciding with the GAMs one. We intend to analyze configurations with realistic experimental parameters, with a special focus on TCABR and JET tokamaks. Both fluid and kinetic descriptions will be considered. The work will be mostly analytical however, numerical works will be eventually performed.

Scientific publications

(7)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

DUARTE, V. N.; GORELENKOV, N. N.; SCHNELLER, M.; FREDRICKSON, E. D.; PEDESTA, M.; BERK, H. L. Study of the likelihood of Alfvenic mode bifurcation in NSTX and predictions for ITER baseline scenarios. NUCLEAR FUSION, v. 58, n. 8 AUG 2018. Web of Science Citations: 2.

GORELENKOV, N. N.; DUARTE, V. N.; PODESTA, M.; BERK, H. L. Resonance broadened quasi-linear (RBQ) model for fast ion distribution relaxation due to Alfvenic eigenmodes. NUCLEAR FUSION, v. 58, n. 8 AUG 2018. Web of Science Citations: 10.

MENG, G.; GORELENKOV, N. N.; DUARTE, V. N.; BERK, H. L.; WHITE, R. B.; WANG, X. G. Resonance frequency broadening of wave-particle interaction in tokamaks due to Alfvenic eigenmode. NUCLEAR FUSION, v. 58, n. 8 AUG 2018. Web of Science Citations: 7.

WOODS, B. J. Q.; DUARTE, V. N.; DE-GAL, A. J.; GORELENKOV, N. N.; VANN, R. G. L. Stochastic effects on phase-space holes and clumps in kinetic systems near marginal stability. NUCLEAR FUSION, v. 58, n. 8 AUG 2018. Web of Science Citations: 3.

DUARTE, V. N.; BERK, H. L.; GORELENKOV, N. N.; HEIDBRINK, W. W.; KRAMER, G. J.; NAZIKIAN, R.; PACE, D. C.; PODESTA, M.; VAN ZEELAND, M. A. Theory and observation of the onset of nonlinear structures due to eigenmode destabilization by fast ions in tokamaks. Physics of Plasmas, v. 24, n. 12 DEC 2017. Web of Science Citations: 14.

DUARTE, V. N.; BERK, H. L.; GORELENKOV, N. N.; HEIDBRINK, W. W.; KRAMER, G. J.; NAZIKIAN, R.; PACE, D. C.; PODESTA, M.; TOBIAS, B. J.; VAN ZEELAND, M. A. Prediction of nonlinear evolution character of energetic-particle-driven instabilities. NUCLEAR FUSION, v. 57, n. 5 MAY 2017. Web of Science Citations: 20.

DUARTE, V. N.; CLEMENTE, R. A.; FARENGO, R. Traveling wave current drive theory for an arbitrary m-polar configuration. Physics of Plasmas, v. 20, n. 3 MAR 2013. Web of Science Citations: 0.