Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Monte Carlo Raytracing Method for Calculating Secondary Electron
  Emission from Micro-Architected Surfaces   Secondary electron emission (SEE) from inner linings of plasma chambers in
electric thrusters for space propulsion can have a disruptive effect on device
performance and efficiency. SEE is typically calculated using elastic and
inelastic electron scattering theory by way of Monte Carlo simulations of
independent electron trajectories. However, in practice the method can only be
applied for ideally smooth surfaces and thin films, not representative of real
material surfaces. Recently, micro-architected surfaces with nanometric
features have been proposed to mitigate SEE and ion-induced erosion in
plasma-exposed thruster linings. In this paper, we propose an approach for
calculating secondary electron yields from surfaces with arbitrarily-complex
geometries using an extension of the \emph{ray tracing} Monte Carlo (RTMC)
technique. We study nanofoam structures with varying porosities as
representative micro-architected surfaces, and use RTMC to generate primary
electron trajectories and track secondary electrons until their escape from the
outer surface. Actual surfaces are represented as a discrete finite element
meshes obtained from X-ray tomography images of tungsten nanofoams. At the
local level, primary rays impinging into surface elements produce daughter rays
of secondary electrons whose number, energies and angular characteristics are
set by pre-calculated tables of SEE yields and energies from ideally-flat
surfaces. We find that these micro-architected geometries can reduce SEE by up
to 50\% with respect to flat surfaces depending on porosity and primary
electron energy.

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The categories of this paper are: hep-ex
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The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
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The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an