Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Characterisation of beam driven ionisation injection in the blowout
  regime of Plasma Acceleration   Beam driven ionisation injection is characterised for a variety of high-Z
dopant. We discuss the region of extraction and why the position where
electrons are captured influences the final quality of the internally-injected
bunch. The beam driven ionisation injection relies on the capability to produce
a high gradient fields at the bubble closure, with magnitudes high enough to
ionise by tunnelling effect the still bounded electrons (of a high-Z dopant).
The ionised electrons are captured by the nonlinear plasma wave at the
accelerating and focusing wake phase leading to high-brightness trailing
bunches. The high transformer ratio guarantees that the ionisation only occurs
at the bubble closure. The quality of the ionisation-injected trailing bunches
strongly and non-linearly depends on the properties of the dopant gas (density
and initial ionisation state). We use the full 3D PIC code ${\tt ALaDyn}$ to
consider the highly three-dimensional nature of the effect. By means of a
systematic approach we have investigated the emittance and energy spread
formation and the evolution for different dopant gases and configurations.

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The categories of this paper are: patt-sol
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The categories of this paper are: math
29
The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: plasm-ph
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The categories of this paper are: stat
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The categories of this paper are: hep-th
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys