Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nanostructured Tube Wakefield Accelerator   Unprecedented $\rm TeVm^{-1}$ acceleration gradients are modeled to be
realizable using a nonlinear surface crunch-in mode in nanostructured tubes.
This mode is realizable using advances in nanofabrication and solid energy
density attosecond bunch compression. Three dimensional computational and
analytical modeling demonstrates GeV energy gain in sub-millimeter long tubes
with effective wall densities $n_{\rm t}\sim10^{22-24}\rm cm^{-3}$ and hundreds
of nanometer core radius when driven by submicron near solid electron beams,
$n_{\rm b}\sim0.05n_{\rm t}$. Besides the many $\rm TVm^{-1}$ average
gradients, strong self-focusing and nanomodulation of the beam which increases
its peak density and the wakefield strength also opens up controlled
high-energy photon production.

23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
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The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
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The categories of this paper are: adap-org
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg