Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Overcoming timestep limitations in boosted-frame Particle-In-Cell
  simulations of plasma-based acceleration   Explicit electromagnetic Particle-In-Cell (PIC) codes are typically limited
by the Courant- Friedrichs-Lewy (CFL) condition, which implies that the
timestep multiplied by the speed of light must be smaller than the smallest
cell size. In the case of boosted-frame PIC simulations of plasma-based
acceleration, this limitation can be a major hinderance as the cells are often
very elongated along the longitudinal direction and the timestep is thus
limited by the small, transverse cell size. This entails many small-timestep
PIC iterations, and can limit the potential speed-up of the boosted-frame
technique. Here, by using a CFL-free analytical spectral solver, and by
mitigating additional numerical instabilities that arise at large timestep, we
show that it is possible to overcome traditional limitations on the timestep
and thereby realize the full potential of the boosted-frame technique over a
much wider range of parameters.

24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
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The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th