Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: How do the barrier thickness and dielectric material influence the
  filamentary mode and CO2 conversion in a flowing DBD?   Dielectric barrier discharges (DBDs) are commonly used to generate cold
plasmas at atmospheric pressure. Whatever their configuration (tubular or
planar), the presence of a dielectric barrier is mandatory to prevent too much
charge build up in the plasma and the formation of a thermal arc. In this
article, the role of the barrier thickness (2.0, 2.4 and 2.8 mm) and of the
kind of dielectric material (alumina, mullite, pyrex, quartz) is investigated
on the filamentary behavior in the plasma and on the CO2 conversion in a
tubular flowing DBD, by means of mass spectrometry measurements correlated with
electrical characterization and IR imaging. Increasing the barrier thickness
decreases the capacitance, while preserving the electrical charge. As a result,
the voltage over the dielectric increases and a larger number of
microdischarges is generated, which enhances the CO2 conversion. Furthermore,
changing the dielectric material of the barrier, while keeping the same
geometry and dimensions, also affects the CO2 conversion. The highest CO2
conversion and energy efficiency are obtained for quartz and alumina, thus not
following the trend of the relative permittivity. From the electrical
characterization, we clearly demonstrate that the most important parameters are
the somewhat higher effective plasma voltage (yielding a somewhat higher
electric field and electron energy in the plasma) for quartz, as well as the
higher plasma current (and thus larger electron density) and the larger number
of microdischarge filaments (mainly for alumina, but also for quartz). The
latter could be correlated to the higher surface roughness for alumina and to
the higher voltage over the dielectric for quartz.

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The categories of this paper are: nucl-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: math
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The categories of this paper are: alg-geom
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: ao-sci
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat