Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generation of ten kilotesla longitudinal magnetic fields in ultraintense
  laser-solenoid target interactions   Production of the huge longitudinal magnetic fields by using an ultraintense
laser pulse irradiating a solenoid target is considered. Through
three-dimensional particle-in-cell simulations, it is shown that the
longitudinal magnetic field up to ten kilotesla can be observed in the
ultraintense laser-solenoid target interactions. The finding is associated with
both fast and return electron currents in the solenoid target. The huge
longitudinal magnetic field is of interest for a number of important
applications, which include controlling the divergence of laser-driven
energetic particles for medical treatment, fast-ignition in inertial fusion,
etc., as an example, the well focused and confined directional electron beams
are realized by using the solenoid target.

34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an