Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Wakefield Acceleration by Radiation Pressure in Relativistic Shock Waves   A particle acceleration mechanism by radiation pressure of precursor waves in
a relativistic shock is studied. For a relativistic, perpendicular shock with
the upstream bulk Lorentz factor of $\gamma_1 \gg 1$, large amplitude
electromagnetic (light) waves are known to be excited in the shock front due to
the synchrotron maser instability, and those waves can propagate towards
upstream as precursor waves. We find that non-thermal, high energy electrons
and ions can be quickly produced by an action of electrostatic wakefields
generated by the ponderomotive force of the precursor waves. The particles can
be quickly accelerated up to $\epsilon_{\rm max}/\gamma_1 m_e c^2 \sim
\gamma_1$ in the upstream coherent wakefield region, and they can be further
accelerated during the nonlinear stage of the wakefield evolution. The maximum
attainable energy is estimated by $\epsilon_{\rm max}/\gamma_1 m_e c^2 \sim
L_{\rm sys}/(c/\omega_{pe})$, where $L_{\rm sys}$ and $c/\omega_{pe}$ are the
size of an astrophysical object and the electron inertial length, respectively.

25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an