skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Resonance broadened quasi-linear (RBQ) model for fast ion distribution relaxation due to Alfvénic eigenmodes

Journal Article · · Nuclear Fusion
 [1]; ORCiD logo [2]; ORCiD logo [1];  [3]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Univ. of Sao Paulo (Brazil). Inst. of Physics
  3. Univ. of Texas, Austin, TX (United States). Inst. for Fusion Studies

The burning plasma performance is limited by the confinement of the super-alfvénic fusion products such as alpha particles and the auxiliary heating ions capable of exciting the Alfvénic eigenmodes (AEs) (Gorelenkov et al 2014 Nucl. Fusion 54 125001). Here in this work the effect of AEs on fast ions is formulated within the quasi-linear (QL) theory generalized for this problem recently (Duarte 2017 PhD Thesis University of São Paulo, Brazil). The generalization involves the resonance line broadened interaction of energetic particles (EP) with AEs supplemented by the diffusion coefficients depending on EP position in the velocity space. A new resonance broadened QL code (or RBQ1D) based on this formulation allowing for EP diffusion in radial direction is built and presented in details. In RBQ1D applications we reduce the wave particle interaction (WPI) dynamics to 1D case when the particle kinetic energy is nearly constant. The diffusion equation for EP distribution evolution is then solved simultaneously for all particles along the angular momentum direction. We make initial applications of the RBQ1D to a DIII-D plasma with elevated q-profile where the beam ions show stiff transport properties (Collins et al (The DIII-D Team) 2016 Phys. Rev. Lett. 116 095001). In conclusion, AE driven fast ion profile relaxation is studied for validations of the QL approach in realistic conditions of beam ion driven instabilities in DIII-D.

Research Organization:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Organization:
USDOE; Sao Paulo Research Foundation
Grant/Contract Number:
AC02-09CH11466; FG02-95ER54309; 2012/22830-2; 2014/03289-4
OSTI ID:
1463326
Journal Information:
Nuclear Fusion, Vol. 58, Issue 8; ISSN 0029-5515
Publisher:
IOP ScienceCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

References (34)

Nonlinear response of driven systems in weak turbulence theory journal May 1996
Prediction of nonlinear evolution character of energetic-particle-driven instabilities journal March 2017
A reduced fast ion transport model for the tokamak transport code TRANSP journal April 2014
Hamiltonian guiding center drift orbit calculation for plasmas of arbitrary cross section journal January 1984
Central flattening of the fast-ion profile in reversed-shear DIII-D discharges journal June 2008
Fast-ion transport by Alfvén eigenmodes above a critical gradient threshold journal May 2017
Effects of MHD instabilities on neutral beam current drive journal April 2015
Quasilinear Diffusion of an Axisymmetric Toroidal Plasma journal January 1972
A Perturbation Theory for Strong Plasma Turbulence journal January 1966
Fast particle finite orbit width and Larmor radius effects on low- n toroidicity induced Alfvén eigenmode excitation journal July 1999
Theory and observation of the onset of nonlinear structures due to eigenmode destabilization by fast ions in tokamaks journal December 2017
Kinetic extensions of magnetohydrodynamics for axisymmetric toroidal plasmas journal February 1992
Phase space effects on fast ion distribution function modeling in tokamaks journal May 2016
Energetic particle physics in fusion research in preparation for burning plasma experiments journal November 2014
Validating predictive models for fast ion profile relaxation in burning plasmas journal July 2016
Effect of dynamical friction on nonlinear energetic particle modes journal September 2010
Modification of particle distributions by MHD instabilities I journal May 2012
Resonance processes in magnetic traps journal January 1960
Computation of Alfvèn eigenmode stability and saturation through a reduced fast ion transport model in the TRANSP tokamak transport code journal July 2017
High-n ideal and resistive shear Alfvén waves in tokamaks journal April 1985
Observation of Critical-Gradient Behavior in Alfvén-Eigenmode-Induced Fast-Ion Transport journal February 2016
Saturation of a single mode driven by an energetic injected beam. III. Alfvén wave problem journal September 1990
Saturation of a single mode driven by an energetic injected beam. II. Electrostatic ‘‘universal’’ destabilization mechanism journal September 1990
Saturation of alpha particle driven instability in Tokamak Fusion Test Reactor journal February 1999
The tokamak Monte Carlo fast ion module NUBEAM in the National Transport Code Collaboration library journal June 2004
Comparing the line broadened quasilinear model to Vlasov code journal March 2014
Resonance frequency broadening of wave-particle interaction in tokamaks due to Alfvénic eigenmode journal June 2018
Effects of energetic particle phase space modifications by instabilities on integrated modeling journal July 2016
Stability of Plasma journal February 1961
Line broadened quasi-linear burst model [fusion plasma] journal December 1995
New techniques for calculating heat and particle source rates due to neutral beam injection in axisymmetric tokamaks journal September 1981
Nonlinear Dynamics of a Driven Mode near Marginal Stability journal February 1996
Resonance processes in magnetic traps journal December 1960
Prediction of Nonlinear Evolution Character of Energetic-Particle-Driven Instabilities text January 2016

Cited By (6)

Verification and application of resonance broadened quasi-linear (RBQ) model with multiple Alfvénic instabilities journal July 2019
Study of the likelihood of Alfvénic mode bifurcation in NSTX and predictions for ITER baseline scenarios journal June 2018
Collisional enhancement of energetic particle Alfvénic resonance width in tokamaks journal March 2019
Resonance frequency broadening of wave-particle interaction in tokamaks due to Alfvénic eigenmode journal June 2018
Resonances between high energy particles and ideal magnetohydrodynamic modes in tokamaks journal October 2018
Study of the likelihood of Alfvénic mode bifurcation in NSTX and predictions for ITER baseline scenarios text January 2018