Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Overview of Researches on Laser Ion Acceleration Using Mixed Solid
  Target and Single Ion Target   The essay gives an overview on researches in the field of laser ion
acceleration, focusing on two types of targets. There are many types of targets
while they can all be divided into targets that apply single ion or multiple
ions. Mixed solid targets are proven efficient in accelerating heavy ions and
generate high-quality ion beams with energy divergence lower than 5%.
Traditional methods like TNSA are mainly used to accelerate protons or heavy
ions and there are still many spaces for modification and improvement.
Applications of laser-driven ion beams are wide in fields like detector
technology, cancer therapy and so on, which is promising and necessary.

5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph