Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optimization of the parameters in the RHIC single crystal heavy ion
  collimation   In the framework of the project to design and test a collimation system
prototype using bent channeling crystal for cleaning of the RHIC heavy ion beam
halo, we have studied the optimal length and bending angle of a silicon (110)
single crystal proposed to be a primary element situated upstream of the
traditional heavy amorphous collimator. Besides the matters of the channeling
and collimation efficiency, we also looked into the impact the crystal may have
on the non-channeled particles that go on circulating in the ring, so as to
reduce the momentum offset of the particles scattered of the crystal.

10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom