Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Haloscope searches for dark matter axions at the Center for Axion and
  Precision Physics Research   The Center for Axion and Precision Physics Research (CAPP) was founded in
2013, with the ambition of shedding light on the strong CP problem and the
proposed existence of axions. Much of CAPP's effort focuses on the direct
detection of dark matter candidate axions with a series of local haloscope
experiments, which endeavour to expand dramatically the coverage on the
"invisible axion" mass range. The first two of them plan experimental runs
during this year, tapping into ultra-low cryogenics and toroidal cavity
geometries. The overall programme builds on cutting-edge technology, including
developments in superconducting films, SQUID amplifiers and novel magnets. This
article presents the planned advancements and the status of the programme,
while it can also be considered a pedagogical introduction to haloscope
experiments.

23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph