Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transition from wakefield generation to soliton formation   It is well known that when a short laser pulse propagates in an underdense
plasma, it induces longitudinal plasma oscillations at the plasma frequency
after the pulse, typically referred to as the 'wakefield'. However, for plasma
densities approaching the critical density wakefield generation is suppressed,
and instead the EM-pulse undergoes nonlinear self-modulation. In this article
we have studied the transition from the wakefield generation to formation of
quasi-solitons as the plasma density is increased. For this purpose we have
applied a one dimensional (1D) relativistic cold fluid model, which has also
been compared with particle-in-cell simulations. A key result is that the
energy loss of the EM-pulse due to wakefield generation has its maximum for a
plasma density of the order 10 percent of the critical density, but that
wakefield generation is sharply suppressed when the density is increased
further.

19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph