Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reflection and implantation of low energy helium with tungsten surfaces   Reflection and implantation of low energy helium (He) ions by tungsten (W)
substrate are studied using molecular dynamics (MD) simulations. Motivated by
the ITER divertor design, our study considers a range of W substrate
temperatures (300 K, 1000 K, 1500 K), a range of He atom incidence energies
($\le$100 eV) and a range of angles of incidence ($0^{\circ}$-$75^{\circ}$)
with respect to substrate normal. The MD simulations quantify the reflection
and implantation function, the integrated moments such as the particle/energy
reflection coefficients and average implantation depths. Distributions of
implantation depths, reflected energy, polar and azimuthal angles of reflection
are obtained, as functions of simulation parameters, such as W substrate
temperature, polar angle of incidence, the energy of incident He, and the type
of W substrate surface. Comparison between the MD simulation results, the
results obtained using SRIM simulation package, and the existing experimental
and theoretical results is provided.

18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex