Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Motion of the Plasma Critical Layer During Relativistic-electron Laser
  Interaction with Immobile and Comoving Ion Plasma for Ion Acceleration   We analyze the motion of the plasma critical layer by two different processes
in the relativistic-electron laser-plasma interaction regime ($a_0>1$). The
differences are highlighted when the critical layer ions are stationary in
contrast to when they move with it. Controlling the speed of the plasma
critical layer in this regime is essential for creating low-$\beta$ traveling
acceleration structures of sufficient laser-excited potential for laser ion
accelerators (LIA). In Relativistically Induced Transparency Acceleration
(RITA) scheme the heavy plasma-ions are fixed and only trace-density light-ions
are accelerated. The relativistic critical layer and the acceleration structure
move longitudinally forward by laser inducing transparency through apparent
relativistic increase in electron mass. In the Radiation Pressure Acceleration
(RPA) scheme the whole plasma is longitudinally pushed forward under the action
of the laser radiation pressure, possible only when plasma ions co-propagate
with the laser front. In RPA the acceleration structure velocity critically
depends upon plasma-ion mass in addition to the laser intensity and plasma
density. In RITA, mass of the heavy immobile plasma-ions does not affect the
speed of the critical layer. Inertia of the bared immobile ions in RITA excites
the charge separation potential whereas RPA is not possible when ions are
stationary.

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The categories of this paper are: chem-ph
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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: bayes-an
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The categories of this paper are: stat
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The categories of this paper are: funct-an
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The categories of this paper are: cond-mat
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The categories of this paper are: q-alg
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The categories of this paper are: cs
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The categories of this paper are: math-ph
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: atom-ph