Resonance broadened quasilinear (RBQ) model for fast ion distribution relaxation due to Alfvénic eigenmodes
The burning plasma performance is limited by the confinement of the superalfvénic 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 quasilinear (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 DIIID plasma with elevated qprofile where the beam ions show stiff transport properties (Collins et al (The DIIID Team) 2016 Phys. Rev. Lett. 116 095001). In conclusion, AEmore »
 Authors:

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 Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
 Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Univ. of Sao Paulo (Brazil). Inst. of Physics
 Univ. of Texas, Austin, TX (United States). Inst. for Fusion Studies
 Publication Date:
 Grant/Contract Number:
 AC0209CH11466; FG0295ER54309; 2012/228302; 2014/032894
 Type:
 Accepted Manuscript
 Journal Name:
 Nuclear Fusion
 Additional Journal Information:
 Journal Volume: 58; Journal Issue: 8; Journal ID: ISSN 00295515
 Publisher:
 IOP Science
 Research Org:
 Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
 Sponsoring Org:
 USDOE; Sao Paulo Research Foundation
 Country of Publication:
 United States
 Language:
 English
 Subject:
 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Alfvenic eigenmodes; fast ion distribution; quasilinear theory
 OSTI Identifier:
 1463326
Gorelenkov, N. N., Duarte, V. N., Podesta, M., and Berk, H. L.. Resonance broadened quasilinear (RBQ) model for fast ion distribution relaxation due to Alfvénic eigenmodes. United States: N. p.,
Web. doi:10.1088/17414326/aac72b.
Gorelenkov, N. N., Duarte, V. N., Podesta, M., & Berk, H. L.. Resonance broadened quasilinear (RBQ) model for fast ion distribution relaxation due to Alfvénic eigenmodes. United States. doi:10.1088/17414326/aac72b.
Gorelenkov, N. N., Duarte, V. N., Podesta, M., and Berk, H. L.. 2018.
"Resonance broadened quasilinear (RBQ) model for fast ion distribution relaxation due to Alfvénic eigenmodes". United States.
doi:10.1088/17414326/aac72b.
@article{osti_1463326,
title = {Resonance broadened quasilinear (RBQ) model for fast ion distribution relaxation due to Alfvénic eigenmodes},
author = {Gorelenkov, N. N. and Duarte, V. N. and Podesta, M. and Berk, H. L.},
abstractNote = {The burning plasma performance is limited by the confinement of the superalfvénic 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 quasilinear (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 DIIID plasma with elevated qprofile where the beam ions show stiff transport properties (Collins et al (The DIIID 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 DIIID.},
doi = {10.1088/17414326/aac72b},
journal = {Nuclear Fusion},
number = 8,
volume = 58,
place = {United States},
year = {2018},
month = {6}
}