  Higher neutron current densities can provide convenience for neutron
experiments. Using neutron optical focusing elements, large flux beams
transported to sample can be achieved. As one kind of focusing elements,
polycapillary lens is very suitable for neutron absorption experiments such as
PGAA and NDP technology. At present, a Neutron Physics and Application
Spectrometer was in construction in CSNS, which is the first pulsed neutron
source in China. To provide some suggestions and ideas for the following design
of enhanced PGAA or NDP instrument with polycapillary lens in CSNS, a first
neutron focusing experiment using polycapillary lens in CSNS was conducted. For
0.5-12.6 polychromatic beam, a focal spot with FWHM of 800 was obtained. As the
value of wavelength increased, the beam size, transmission efficiency and gain
increased. For cold neutron, the gain maintained in a level of 7.
