Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optimized laser ion acceleration at the relativistic critical density
  surface   In the effort of achieving high-energetic ion beams from the interaction of
ultrashort laser pulses with a plasma, volumetric acceleration mechanisms
beyond Target Normal Sheath Acceleration have gained attention. A
relativisticly intense laser can turn a near critical density plasma slowly
transparent, facilitating a synchronized acceleration of ions at the moving
relativistic critical density front. While simulations promise extremely high
ion energies in in this regime, the challenge resides in the realization of a
synchronized movement of the ultra-relativistic laser pulse ($a_0\gtrsim 30$)
driven reflective relativistic electron front and the fastest ions, which
imposes a narrow parameter range on the laser and plasma parameters. We present
an analytic model for the relevant processes, confirmed by a broad parameter
simulation study in 1D- and 3D-geometry. By tayloring the pulse length plasma
density profile at the front side, we can optimize the proton acceleration
performance and extend the regions in parameter space of efficient ion
acceleration at the relativistic relativistic density surface.

7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an