Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Debris Engine: A Potential Thruster for Space Debris Removal   We present a design concept for a space engine that can continuously remove
the orbit debris by using the debris as a propellant. Space robotic cleaner is
adopted to capture the targeting debris and to transfer them into the engine.
Debris with larger size is first disintegrated into small pieces by using a
mechanical method. The planetary ball mill is then adopted to grind the pieces
into micrometer or smaller powder. The energy needed in this process is get
from the nuclear and solar power. By the effect of gamma-ray photoelectric or
the behavior of tangently rub of tungsten needles, the debris powered is
charged. This behavior can be used to speed up the movement of powder in a
tandem electrostatic particle accelerator. By ejecting the high-temperture and
high-pressure charged powered from the nozzle of the engine,the continuously
thrust is obtained. This thrust can be used to perform orbital maneuver and
debris rendezvous for the spacecraft and robotic cleaner. The ejected charged
particle will be blown away from the circumterrestrial orbit by the solar wind.
By digesting the space debris, we obtain not only the previous thrust but also
the clean space. In the near future, start trek will not just a dream, human
exploration will extend to deep universe. The analysis shown, the magnitude of
the specific impulse for debris engine is determined by the accelerating
electrostatic potential and the charge-to-mass ratio of the powder.

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The categories of this paper are: bayes-an
2
The categories of this paper are: math
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph