Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reflected attosecond pulse radiation from moving electron layers   With the generation of high order harmonics (HHG) on the plasma surface it is
possible to turn the laser pulse into a train of attosecond or even zeptosecond
pulses in the back radiation. These attosecond pulses may have amplitude
several orders of magnitude larger than that of the laser pulse under
appropriate conditions. We study this process in detail, especially the
nanobunching of the plasma electron density. We derive the analytical
expression that describes the electron density profile and obtain a good
agreement with particle-in-cell simulations. We investigate the most efficient
case of HHG at moderate laser intensity (a0 = 10) on the over dense plasma slab
with an exponential profile per-plasma. Subsequently we calculate the spectra
of single attosecond pulses from back radiation using our expression for
density shape in combination with the equation for spectrum of nanobunch
radiation.

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The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th