Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The slow collisional ExB ion drift characterized as the major
  instability mechanism of a poorly magnetized plasma column with an
  inward-directed radial electric field   The low-frequency instability of a cylindrical poorly magnetized plasma with
an inward-directed radial electric field is studied changing the gas pressure
and the ion cyclotron frequency. The unstable frequency always decreases when
the gas pressure is increased indicating collisional effects. At a fixed
pressure, the unstable frequency increases with the magnetic field when the
B-field is low and decreases at larger magnetic field strength. We find that
the transition between these two regimes is obtained when the ion cyclotron
frequency equals the ion-neutrals collision frequency. This is in agreement
with the theory of the slow-ion drift instability induced by the collisional
slowing of the electric ion drift (A. Simon, Phys. Fluids 6, 382, (1963).

31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an