Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Numerical investigation of reversed gas feed configurations for Hall
  thrusters   A reversed gas feed configuration for Hall thrusters is proposed and studied
numerically. As an alternative to standard direct injection, we investigate the
effect of injecting the propellant near the channel exit and directing it
backwards, towards the anode. The resulting neutral density and average
velocity fields are studied with the Direct Simulation Monte Carlo method for
both cold and warm anode conditions. The residence time of neutral particles
inside the channel and in the ionization region is computed using a
test-particle Monte Carlo method. The computations indicate that the reversed
injection allows for increasing the mass utilization efficiency of a standard
feed configuration from 2-5% to a maximum of 20-30% depending on the initial
efficiency.

22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an