Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Positron Driven High-Field Terahertz Waves in Dielectric Material   Advanced acceleration methods based on wakefields generated by high energy
electron bunches passing through dielectric-based structures have demonstrated
$>$GV/m fields, paving the first steps on a path to applications such as future
compact linear colliders. For a collider scenario, it is desirable that, in
contrast to plasmas, wakefields in dielectrics do not behave differently for
positron and electron bunches. In this Letter, we present measurements of large
amplitude fields excited by positron bunches with collider-relevant parameters
(energy 20 GeV, and $0.7 \times 10^{10}$ particles per bunch) in a 0.4 THz,
cylindrically symmetric dielectric structure. Interferometric measurements of
emitted coherent Cerenkov radiation permit spectral characterization of the
positron-generated wakefields, which are compared to those excited by electron
bunches. Statistical equivalence tests are incorporated to show the charge-sign
invariance of the induced wakefield spectra. Transverse effects on positron
beams resulting from off-axis excitation are examined and found to be
consistent with the known linear response of the DWA system. The results are
supported by numerical simulations and demonstrate high-gradient wakefield
excitation in dielectrics for positron beams.

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The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
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The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
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The categories of this paper are: quant-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: plasm-ph