Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Effects of Front-Surface Target Structures on Properties of
  Relativistic Laser-Plasma Electrons   We report the results of a study of the role of prescribed geometrical
structures on the front of a target in determining the energy and spatial
distribution of relativistic laser-plasma electrons. Our 3D PIC simulation
studies apply to short-pulse, high intensity laser pulses, and indicate that a
judicious choice of target front-surface geometry provides the realistic
possibility of greatly enhancing the yield of high energy electrons, while
simultaneously confining the emission to narrow (< 5 degree) angular cones.

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The categories of this paper are: hep-th
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-ph
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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: solv-int
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The categories of this paper are: quant-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: ao-sci
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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: q-bio