Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ion acceleration in electrostatic collisionless shock: on the optimal
  density profile for quasi-monoenergetic beams   A numerical study on ion acceleration in electrostatic shock waves is
presented, with the aim of determining the best plasma configuration to achieve
quasi-monoenergetic ion beams in laser-driven systems. It was recently shown
that tailored near-critical density plasmas characterized by a long-scale
decreasing rear density profile lead to beams with low energy spread [F.
Fi\'uza et al., Physical Review Letters 109, 215001 (2012)]. In this work, a
detailed parameter scan investigating different plasma scale lengths is carried
out. As result, the optimal plasma spatial scale length that allows for
minimizing the energy spread while ensuring a significant reflection of ions by
the shock is identified. Furthermore, a new configuration where the required
profile has been obtained by coupling micro layers of different densities is
proposed. Results show that this new engineered approach is a valid
alternative, guaranteeing a low energy spread with a higher level of
controllability.

21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol