Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Investigating of electrons bunching in a Penning trap and accelerating
  process for CO2 gas mixture active medium   In the presence of an active medium incorporated in a Penning trap, the
moving electrons can become bunched, as they get enough energy, they escape the
trap forming an optical injector. These bunched electrons can enter next PASER
section filled with the same active medium to be accelerated. In this paper,
electron dynamics in the presence of gas mixture active medium incorporated in
a penning trap is analyzed by developing an idealized 1D model. We further
evaluate the energy exchange occurring as the train of electrons traversing the
next PASER section. The results show that the oscillating electrons can be
bunched at the resonant frequency of the active medium. The influence of the
trapped time and the population inversion are analyzed, which shows that the
longer the electrons are trapped, the more energy from the medium the
accelerated electrons get, and with the increase of the population inversion,
the decelerated electrons virtually unchanged but the accelerated electrons
more than double their peak energy values. What is more, the simulation results
show that the gas active medium need lower population inversion to bunch the
electrons compared to the solid active medium. So the experimental condition is
easy to be achieved.

29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg