Journal ArticleDOI
Energetic particle drive for toroidicity-induced Alfven eigenmodes and kinetic toroidicity-induced Alfven eigenmodes in a low-shear tokamak
Boris Breizman,S. E. Sharapov +1 more
TLDR
In this article, the structure of toroidicity-induced Alfven eigenmodes and kinetic TAE (KTAE) with large mode numbers is analyzed and the linear power transfer from energetic particles to these modes is calculated in the low-shear limit when each mode is localized near a single gap within an interval whose total width Delta out is much smaller than the radius of the mode location.Abstract:
The structure of toroidicity-induced Alfven eigenmodes (TAE) and kinetic TAE (KTAE) with large mode numbers is analysed and the linear power transfer from energetic particles to these modes is calculated in the low-shear limit when each mode is localized near a single gap within an interval whose total width Delta out is much smaller than the radius rm of the mode location. Near its peak where most of the mode energy is concentrated, the mode has an inner scale length Delta in, which is much smaller than Delta out. The scale Delta in is determined by toroidicity and kinetic effects, which eliminate the singularity of the potential at the resonant surface. This work examines the case when the drift orbit width of energetic particles Delta b is much larger than the inner scale length Delta in, but arbitrary compared to the total width of the mode. It is shown that the particle-to-wave linear power transfer is comparable for the TAE and KTAE modes in this case. The ratio of the energetic particle contributions to the energetic particle drive for the TAE and KTAE modes is then roughly equal to the inverse ratio of the mode energies. It is found that in the low-shear limit the energetic particle drive for the KTAE modes can be larger than that for the TAE modes.read more
Citations
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Journal ArticleDOI
Chapter 5: Physics of energetic ions
Ambrogio Fasoli,C. Gormenzano,Herbert L Berk,Boris Breizman,Sergio Briguglio,D. S. Darrow,Nikolai Gorelenkov,W. W. Heidbrink,A. Jaun,Sergey Konovalov,Raffi Nazikian,J.-M. Noterdaeme,S. E. Sharapov,Kouji Shinohara,Duccio Testa,Kenji Tobita,Yasushi Todo,Gregorio Vlad,Fulvio Zonca +18 more
TL;DR: A review of the progress accomplished since the redaction of the first ITER Physics Basis (1999 Nucl Fusion 39 2137-664) in the field of energetic ion physics and its possible impact on burning plasma regimes is presented in this paper.
Journal ArticleDOI
Energetic particle physics in fusion research in preparation for burning plasma experiments
TL;DR: A broad review of the progress that has been made in EP physics in tokamaks and spherical tori since the first DT experiments on TFTR and JET (Joint European Torus), including stellarator/helical devices is given in this article.
Journal ArticleDOI
The HAGIS self-consistent nonlinear wave-particle interaction model
S. D. Pinches,L. C. Appel,Jeff Candy,S. E. Sharapov,Herbert L Berk,D. N. Borba,Boris Breizman,T. C. Hender,Keith I. Hopcraft,G. T.A. Huysmans,Wolfgang Kerner +10 more
TL;DR: In this article, the problem of modeling the selfconsistent interaction of an energetic particle ensemble with a wave spectrum specific to magnetically confined plasmas in a torus is discussed.
Journal ArticleDOI
Physics of energetic ions
J. Jacquinot,S. Putvinski,G. Bosia,Atsushi Fukuyama,R. Hemsworth,Sergey Konovalov,Yoshihiko Nagashima,W. M. Nevins,K. Rasumova,Francesco Romanelli,Kenji Tobita,Kenkichi Ushigusa,J. W. Van Dam,V. Vdovin,Herbert L Berk,D. N. Borba,Boris Breizman,R.V. Budny,Jeff Candy,Chio-Zong Cheng,C. D. Challis,Ambrogio Fasoli,Guoyong Fu,W. W. Heidbrink,Raffi Nazikian,G. Martin,Francesco Porcelli,M. H. Redi,Marshall N. Rosenbluth,G.J. Sadler,S. E. Sharapov,Donald A. Spong,Ryan M. White,Fulvio Zonca,F. W. Perkins,Douglass E. Post,Nermin A. Uckan,Masafumi Azumi,David Campbell,N. Ivanov,N. R. Sauthoff,Masahiro Wakatani,M. Shimada,J. Van Dam +43 more
TL;DR: In this paper, a review of the physics knowledge relevant to design of a reactor scale tokamak is presented, and projections for ITER are provided in this Chapter of the ITER Physics Basis.
Journal ArticleDOI
Alfvén wave cascades in a tokamak
S. E. Sharapov,B. Alper,Herbert L Berk,D. N. Borba,Boris Breizman,C. D. Challis,Ambrogio Fasoli,N. C. Hawkes,T. C. Hender,J. Mailloux,S. D. Pinches,D. Testa +11 more
TL;DR: In this paper, Rebut et al. studied the time evolution of the Alfven cascades and their safety factor at the point of zero magnetic shear and showed that the safety factor has a maximum at the zero shear point.
References
More filters
Journal ArticleDOI
Variational principles of guiding centre motion
TL;DR: In this article, an elementary but rigorous derivation for a variational principle for guiding center motion is given, and the application of variational principles in the derivation and solution of gyrokinetic equations is discussed.
Journal ArticleDOI
Low-n shear Alfven spectra in axisymmetric toroidal plasmas
Chio-Zong Cheng,M. S. Chance +1 more
TL;DR: In this article, it was shown both analytically and numerically that the toroidicity not only breaks up the shear Alfven continuous spectrum, but also creates new discrete toroidic induced shear eigenmodes with frequencies inside the continuum gaps.
Journal ArticleDOI
High- n ideal and resistive shear Alfvén waves in tokamaks
TL;DR: In this paper, the ideal and resistive MHD equations for the shear Alfven waves are studied in a low-β toroidal model by employing the high-n ballooning formalism.
Journal ArticleDOI
Excitation of the toroidicity-induced shear Alfvén eigenmode by fusion alpha particles in an ignited tokamak
Guoyong Fu,J. W. Van Dam +1 more
TL;DR: In this article, the toroidicity-induced shear Alfven eigenmode was found to be destabilized by fusion alpha particles in an ignited tokamak plasma.
Journal ArticleDOI
Excitation of toroidal Alfvén eigenmodes in TFTR.
K. L. Wong,R. J. Fonck,S. F. Paul,D. Roberts,E.D. Fredrickson,Raffi Nazikian,Hyeon K. Park,M.G. Bell,N. L. Bretz,Robert Budny,Samuel A. Cohen,Gregory W. Hammett,F. C. Jobes,Dale Meade,S. S. Medley,D. Mueller,Yoshio Nagayama,D.K. Owens,E. J. Synakowski +18 more
TL;DR: Deuterium neutral beams with energies up to 110 keV were injected into TFTR (Tokamak Fusion Test Reactor) plasmas at low magnetic field such that the beam injection velocities were comparable to the Alfven velocity.
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