Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dream Machines   Particle accelerators and their detectors are the world's most powerful
microscopes. They enable us to inspect the constituents of matter at attometer
scales, study matter under unusual conditions, and concentrate extraordinary
amounts of energy into tiny volumes to create new forms of matter and initiate
new phenomena. The progress of particle physics and of accelerator science and
technology go hand in hand. I look to the past, present, and future, raising
questions that we would like to answer about nature along the way.

32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc