Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stirring Unmagnetized Plasma   A new concept for spinning unmagnetized plasma is demonstrated
experimentally. Plasma is confined by an axisymmetric multi-cusp magnetic field
and biased cathodes are used to drive currents and impart a torque in the
magnetized edge. Measurements show that flow viscously couples momentum from
the magnetized edge (where the plasma viscosity is small) into the unmagnetized
core (where the viscosity is large) and that the core rotates as a solid body.
To be effective, collisional viscosity must overcome the ion-neutral drag due
to charge exchange collisions.

15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat