Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Combined Microwave and Laser Rayleigh Scattering Diagnostics for
  Pin-to-Pin Nanosecond Discharges   In this work, the temporal decay of electrons produced by an atmospheric
pin-to-pin nanosecond discharge operating in the spark regime was measured via
a combination of microwave Rayleigh scattering (MRS) and laser Rayleigh
scattering (LRS). Due to the initial energy deposition of the nanosecond pulse,
a variance in local gas density occurs on the timescale of electron decay.
Thus, the assumption of a constant collisional frequency is no longer
applicable when electron number data is extracted from the MRS measurements. To
recalibrate the MRS measurements throughout the electron decay period,
temporally-resolved LRS measurements of the local gas density were performed
over the event duration. Local gas density was measured to be 30% of the
ambient level during the later stages of electron decay and recovers at about 1
ms after the discharge. A shock front traveling approximately 500 m/s was
additionally observed. Coupled with plasma volume calibration via
temporally-resolved ICCD imaging, the corrected decay curves of the electron
number and electron number density are presented with a measured peak electron
number density of 4.5*10^15 cm^-3 and decay rate of ~ 0.1-0.35*10^7 s^-1. A
hybrid MRS and LRS diagnostic technique can be applied for a broad spectrum of
atmospheric-pressure microplasmas where a variation in number gas density is
expected due to an energy deposition in the discharge.

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The categories of this paper are: q-alg
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: adap-org
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The categories of this paper are: funct-an
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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: nlin
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The categories of this paper are: solv-int
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: math
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The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph
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The categories of this paper are: cond-mat