Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multipactor suppression in dielectric-assist accelerating structures via
  diamond-like carbon coatings   Multipactor discharges are widely observed in the accelerator field, and
their suppression has been studied to improve accelerator performance.
  A dielectric-assist accelerating (DAA) cavity is a standing-wave accelerating
cavity that attains a Q-value of over 100,000 at room temperature by using the
reflection of the dielectric layer; the DAA cavity is expected to be used with
a small RF power source and high-duty operation.
  Thus far, the maximum accelerating field of DAA cavities has been limited to
a few MV/m by the multipactor.
  By applying a diamond-like carbon (DLC) coating to reduce the secondary
electron emission coefficient without sacrificing the Q-value of the cavity, we
have demonstrated that a $6~[{\rm \mu s}]$ RF pulse can be injected into a DAA
cavity with a field of more than 10~[MV/m] while suppressing the multipactor.

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The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
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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: alg-geom
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The categories of this paper are: patt-sol
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
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The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math