Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multi-scale analysis of global electromagnetic instabilities in ITER
  Pre-Fusion-Power Operation plasmas   Global electromagnetic gyrokinetic simulations are performed with the
Particle-in-Cell code ORB5 for an ITER Pre-Fusion-Power-Operation (PFPO) plasma
scenario, with half-field (2.65 T) and half-current (7.5 MA). We report on a
'multi-scale' analysis of the discharge, considering eigenmodes and instabilies
across three scale-lengths. Although the scenario will nominally have neutral
beam heating with particles injected with 1 MeV, Alfv\'en eigenmodes are
investigated in the absence of such source, and Reversed Shear (RSAE), Toroidal
(TAE) and Elliptical (EAE) Alfv\'en eigenmodes are found with weak damping for
moderately low toroidal mode numbers ($10 \leq n \leq 35$). At higher toroidal
mode numbers ($40 \leq n \leq 70$), unstable Alfv\'enic modes have been
observed close to rational surfaces and are labelled as Beta-induced Alfv\'en
eigenmodes (BAE)/Alfv\'enic Ion Temperature Gradient (AITG) modes, since their
frequency is associated with the BAE gap and they are driven by the bulk plasma
on the Alfv\'enic continuum. These modes are unstable in the absence of
energetic particles, and adding a species of energetic particles (with an
isotropic 1 MeV slowing down distribution) has negligible impact on their
growth rate. At higher toroidal mode numbers ($150 \lessapprox n < 220$), low
frequency microscale instabilities are observed.

31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
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The categories of this paper are: patt-sol
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The categories of this paper are: nlin
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The categories of this paper are: stat
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The categories of this paper are: nucl-ex
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The categories of this paper are: funct-an
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The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat