Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Secondary electron yield measurements from thin surface coatings for NLC
  electron cloud reduction   In the beam pipe of the positron damping ring of the Next Linear Collider,
electrons will be created by beam interaction with the surrounding vacuum
chamber wall and give rise to an electron cloud. Several solutions are possible
for avoiding the electron cloud, without changing the bunch structure or the
diameter of the vacuum chamber. Some of the currently available solutions for
preventing this spurious electron load include reducing residual gas ionization
by the beam, minimizing beam photon-induced electron production, and lowering
the secondary electron yield (SEY) of the chamber wall. We will report on
recent SEY measurements performed at SLAC on TiN coatings and TiZrV
non-evaporable getter thin films.

4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg