Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bow shock fragmentation driven by a thermal instability in
  laboratory-astrophysics experiments   The role of radiative cooling during the evolution of a bow shock was studied
in laboratory-astrophysics experiments that are scalable to bow shocks present
in jets from young stellar objects. The laboratory bow shock is formed during
the collision of two counter-streaming, supersonic plasma jets produced by an
opposing pair of radial foil Z-pinches driven by the current pulse from the
MAGPIE pulsed-power generator. The jets have different flow velocities in the
laboratory frame and the experiments are driven over many times the
characteristic cooling time-scale. The initially smooth bow shock rapidly
develops small-scale non-uniformities over temporal and spatial scales that are
consistent with a thermal instability triggered by strong radiative cooling in
the shock. The growth of these perturbations eventually results in a global
fragmentation of the bow shock front. The formation of a thermal instability is
supported by analysis of the plasma cooling function calculated for the
experimental conditions with the radiative packages ABAKO/RAPCAL.

13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th