Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Vacuum Technology for Ion Sources   The basic notions of vacuum technology for ion sources are presented, with
emphasis on pressure profile calculation and choice of pumping technique. A
Monte Carlo code (Molflow+) for the evaluation of conductances and the
vacuum-electrical analogy for the calculation of time-dependent pressure
variations are introduced. The specific case of the Linac4 H- source is
reviewed.

37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int