Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Terahertz radiation source using an industrial electron linear
  accelerator   High power ($\sim 100$ kW) industrial electron linear accelerators (linacs)
are used for irradiation applications e.g., for pasteurization of food
products, disinfection of medical waste, etc. We propose that high power
electron beam from such an industrial linac can be first passed through an
undulator to generate powerful terahertz (THz) radiation, and the spent
electron beam coming out of the undulator can still be used for industrial
applications. This will enhance the utilisation of a high power industrial
linac. We have performed calculation of spontaneous emission in the undulator
to show that for typical parameters, continuous terahertz radiation having
power of the order of $\mu$W can be produced, which may be useful for many
scientific applications.

8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn