Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optimization and first tests of the experimental setup to investigate
  the double-polarized DD-fusion reactions   The study of DD reactions, especially with polarized reactants, helps for
better understanding of the processes taking place in nuclear astrophysics and
fusion reactors. At PNPI Gatchina, Russia, the PolFusion experiment with
crossing of two polarized beams, i.e. a deuteron and a deuterium beam, is able
to measure angular distributions of the differential cross section and,
therefore, the spin-correlations coefficients with different combinations of
the adjustable nuclear polarization of both beams with a center-of-mass energy
between 10 to 100 keV. Some improvements and fine-tuning of the polarized ion
source are performed and presented. The atomic beam source for the jet target
has been modified as well. An unpolarized experiment with a 10 keV ion beam and
heavy water vapor as a target has been carried out with successful registration
of the fusion products

4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
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