Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Challenge of polarized beams at future colliders   A short overview about the potential of polarized beams at future colliders
is given. In particular the baseline design for polarized beams at the ILC is
presented and the physics case for polarized $e^-$ and $e^+$ is discussed. In
order to fulfil the precision requirements spin tracking from the source to the
interaction point is needed. Updates concerning the theoretical calculations as
well as their implementation in simulation codes are reported.

32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn