Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Field emission in diode and triode vacuum nanostructures   The paper discusses the nano-diode and nano-triode structures of vacuum
electronics. Such structures may have the dielectric film with the thickness of
several nanometers wich is located on the cathode. Such film with a large
dielectric constant reduces the thickness of the potential barrier by about
film thickness and reduces the height of barrier. The grid electrode structure
may contain several periods of metallization with a thickness of tens of
nanometers, which allows one to obtain the resonant under barrier tunneling.
For all structures we obtained electrostatic Green's function, the built
profiles potential barriers, the calculated tunneling coefficients and
Volt-Ampere Characteristics (VAC) with regard to the distribution of electron
energies. The structures under consideration require to use of low voltages on
the gate (grid) electrodes. They are promising for the electron gun with a
large current controlled by low voltage on the grid, for example, in TWT with
subsequent acceleration of the electron beam. Since a major influence on the
tunneling provides the grid, the electrons emitted from the grid with
approximately the Fermi velocity, and the calculation of the electron gun with
multiple electrodes after the grid is greatly simplified.

11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas