Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonresonance adiabatic photon confinement in spherical mirror system.
  Experimental study   New nonresonance approach of photon accumulation in two spherical mirrors has
been experimentally demonstrated. In this work, we have received a high
accumulation coefficient and shown good effectiveness of this technique for
creating photo neutralizer of negative ion beams. This efficiency in such
concept is generally determined by reflectance mirrors and is practically not
dependent of input emission quality and does not require high precision
adjusting the optical elements.

20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph