Results 81 to 90 of about 20,493 (125)

A model for Alfvén-eigenmode-induced transport of fast ions in stellarators

Nuclear Fusion
A novel model for Alfvén-eigenmode-induced transport of fast ions in stellarators is introduced. A variety of reduced transport models exists for tokamaks, but nothing comparable currently exists for stellarators.
C. Slaby, R. Kleiber, A. Könies, M.I. Wolf, M. Borchardt   +4 more
doaj   +1 more source

Hybrid kinetic-MHD modeling of alpha-driven TAEs in the SPARC tokamak

Nuclear Fusion
As the magnetic confinement fusion community prepares for the next generation of fusion devices and burning plasmas, there is still a question of whether fast ions (FIs) will drive MHD instabilities, causing significant redistribution or even loss of FIs,
R.A. Tinguely, J. Gonzalez-Martin, Y. Todo   +2 more
doaj   +1 more source

Overview of fast particle experiments in the first MAST Upgrade experimental campaigns

Nuclear Fusion
MAST-U is equipped with on-axis and off-axis neutral beam injectors (NBI), and these external sources of super-Alfvénic deuterium fast-ions provide opportunities for studying a wide range of phenomena relevant to the physics of alpha-particles in burning
J.F. Rivero-Rodríguez, K.G. McClements, M. Fitzgerald, S.E. Sharapov, M. Cecconello, N.A. Crocker, I. Dolby, M. Dreval, N. Fil, J. Galdón-Quiroga, M. García-Muñoz, S. Blackmore, W. Heidbrink, S. Henderson, A. Jackson, A. Kappatou, D. Keeling, D. Liu, Y.Q. Liu, C. Michael, H.J.C. Oliver, P. Ollus, E. Parr, G. Prechel, T. Rhodes, D. Ryan, P. Shi, M. Vallar, L. Velarde, T. Williams, H. Wong, the EUROfusion Tokamak Exploitation Team, the MAST-U Team   +32 more
doaj   +1 more source

Axisymmetric global Alfvén eigenmodes within the ellipticity-induced frequency gap in the Joint European Torus

, 2017
Alfvén eigenmodes (AEs) with toroidal mode number n = 0 (i.e., axisymmetric) have been observed in the ellipticity-induced frequency range in the Joint European Torus.
Zheng, L.J., Salmi, Antti, Hakola, Antti; id_orcid, Koivuranta, Seppo, Sirén, Paula, Oliver, H.J.C., Tala, Tuomas, Aho-Mantila, Leena, Breizman, B.N., Likonen, Jari; id_orcid, Airila, Markus; id_orcid, Sharapov, S.E.   +11 more
core   +1 more source

Suprathermal Electrons and Alfvén Eigenmodes in Sawtoothing Tokamak Plasmas

, 2007
In the Joint European Torus (JET) tokamak, monster sawtooth stabilisation by ICRH-accelerated hot ions is lost if plasma density falls below a certain density threshold, or if energetic-ion driven Alfvén eigenmodes inside q = 1 occur.
Sandquist, Patrik
core  

Observation of multiple beta-induced Alfvén eigenmodes driven by runaway electrons in EAST Ohmic discharge

Nuclear Fusion
Multiple Beta-induced Alfvén eigenmodes (BAEs) excited by runaway electrons (REs) have been observed in low-density Ohmic discharges in the EAST tokamak.
C.X. Luo, L. Zeng, J. Bao, X. Zhu, T. Tang, R.R. Ma, S.Y. Lin, T.H. Shi, J.P. Qian, H.Q. Liu, Z.Y. Qiu, Y.F. Liang, X. Gao   +12 more
doaj   +1 more source

Development of slow and fast wave coupling and heating from the C-Stellarator to NSTX

EPJ Web of Conferences, 2017
A historical perspective on key discoveries which contributed to understanding the properties of coupling both slow and fast waves and the effects on plasma heating and current drive will be presented.
Hosea Joel
doaj   +1 more source

Microturbulence Suppression by Alfvén Eigenmodes in the DIII-D Tokamak

Mitigation and suppression of low-k turbulence are observed during the nonlinear evolution of toroidicity-induced Alfvén eigenmodes (TAEs) in DIII-D experiments.
Schmitz, L, Heidbrink, WW, Austin, ME, Van Zeeland, MA, Callahan, KJ, Wang, HQ, Yan, Z, Shi, N, Diamond, PH, Liu, L, McKee, GR, Du, XD   +11 more
core   +1 more source

Generation of shear flows induced by AE / EPM in LHD plasma

Nuclear Fusion
The generation of shear flows (SFs) by Alfven Eigenmodes (AEs) and energetic particle modes (EPMs) have important effects on the operation of future nuclear fusion reactors, because SFs regulate the saturation of the AEs/EPMs, the transport of EPs and ...
J. Varela, C. Hidalgo, T. Tokuzawa, K. Nagaoka, K. Tanaka, K. Nagasaki, S. Ohdachi, K. Ida, X. Du, A. Cappa, S. Sharapov, D. Zarzoso, D.A. Spong, L. Garcia, Y. Ghai, J. Ortiz   +15 more
doaj   +1 more source

Perturbative model for the saturation of energetic-particle-driven modes limited by self-generated zonal modes

Nuclear Fusion
We present a simplified energy-conserving approach to incorporate wave–wave nonlinear effects within the framework commonly used to describe wave–particle nonlinearities.
T. Barberis, V.N. Duarte, E.J. Hartigan-O’Connor, N.N. Gorelenkov   +3 more
doaj   +1 more source