Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Progress on the 140 KV, 10 Megawatt Peak, 1 Megawatt Average Polyphase
  Quasi-Resonant Bridge, Boost Converter/Modulator for the Spallation Neutron
  Source (SNS) Klystron Power System
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
18
The categories of this paper are: econ
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph