Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mode structure symmetry breaking of reversed shear Alfv\'en eigenmodes
  and its impact on the generation of parallel velocity asymmetries in
  energetic particle distribution   In this work, the gyrokinetic eigenvalue code LIGKA, the drift-kinetic/MHD
hybrid code HMGC and the gyrokinetic full-f code TRIMEG-GKX are employed to
study the mode structure details of Reversed Shear Alfv\'en Eigenmodes (RSAEs).
Using the parameters from an ASDEX-Upgrade plasma, a benchmark with the three
different physical models for RSAE without and with Energetic Particles (EPs)
is carried out. Reasonable agreement has been found for the mode frequency and
the growth rate. Mode structure symmetry breaking (MSSB) is observed when EPs
are included, due to the EPs' non-perturbative effects. It is found that the
MSSB properties are featured by a finite radial wave phase velocity, and the
linear mode structure can be well described by an analytical complex Gaussian
expression $A(s)=e^{- \sigma (s-s_0)^2}$ with complex parameters $\sigma$ and
$s_0$, where $s$ is the normalized radial coordinate. The mode structure is
distorted in opposite {manners} when the EP drive shifted from one side of
$q_{min}$ to the other side, and specifically, a non-zero average radial wave
number $\langle k_s\rangle$ with opposite signs is generated. The initial EP
density profiles and the corresponding mode structures have been used as the
input of HAGIS code to study the EP transport. The parallel velocity of EPs is
generated in opposite directions, due to different values of the average radial
wave number $\langle k_s\rangle$, corresponding to different initial EP density
profiles with EP drive shifted away from the $q_{min}$.

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The categories of this paper are: dg-ga
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The categories of this paper are: mtrl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: stat
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The categories of this paper are: math
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con
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The categories of this paper are: nlin
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The categories of this paper are: hep-th
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The categories of this paper are: cond-mat
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The categories of this paper are: quant-ph