Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Study of some parameters interstellar transport using of magnetic
  umbrella   Interstellar transport is an object of interest in many sci-fi stories. In
history a lot of sci-fi predictions have turned into reality, such as
communications satellites, deep-sea submarines and journies to the moon. In
this work we study some physical parameters of a space ship which uses a
magnetic umbrella. Our spaceship generates a magnetic field in its neighborhood
and captures charged protons into a magnetic trap. These particles are taken
into a fusion reactor. The obtained energy and waste in form of helium are used
as a fuel in an ion engine. With the help of elementary physics we can work out
the basic physical parameters of the ship, e.g. maximal velocity, acceleration
of the ship or acceleration time period.

15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con