Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Similar angular THz radiation pattern emitted by filament plasma channel
  with different length   Influence of plasma channel length on angular THz radiation pattern is
studied experimentally. It is shown that the angular distribution of THz
radiation depends only on the focusing conditions and does not depend on the
length of the plasma channel. A qualitative explanation of the screening of THz
radiation by a filament plasma is proposed

29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc