Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dielectric permeability at accounting of electrons contribution into
  their own screening   In this paper the experimental fact of presence of ionic - sound oscillations
in plasma of tokamak DIII-D is given for plasma with additional heating by
means of a neutral hydrogen beam. It contradicts modern theoretical
representations about an opportunity of the build-up of such type of
oscillations in plasma, when an ionic temperature is biger than an electronic
one. Inasmuch as electrons provide the own screening by means of pushing aside
forcibly around of itself of electrons and by baring an ionic skeleton their
polarizing cloud should be of bigger radius than radius of Debye. Therefore the
authors have suggested search of the decision of a kinetic equation, by taking
into account the electrons contribution into their own screening, by means of
inserting of some multiplier for Debye radius and of appropriate dividing of
frequency onto this factor. In result a new expression of dielectric
permeability is received which pass into former when the entered multiplier is
identically equal to unit. The analysis of this expression has shown, that
frequencies characteristics of possible low-frequency and high-frequency
fluctuations have remained with former plasma frequencies, ionic - sound
fluctuations have received the same phase velocity, but the condition of their
excitation became different which for pure deuterium plasmas now has got a
view: relation of the ionic temperature to the electronic is smaller than ten,
instead of a former condition - relation of the electronic temperature to ionic
one is biger than ten.

15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat