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.
@article{arxiv.2203.11270,
title = {Recent neutron focusing experiments using polycapillary lens in CSNS},
author = {Kai Pan and Xue-Peng Sun and Tian-Cheng Yi and Song-Ling Wang and Jian-Rong Zhou and Mo Zhou and Xing-Fen Jiang and Bin Zhou and Bo-Wen Jiang and Tian-Xi Sun and Tian-Jiao Liang and Zhi-Guo Liu},
journal= {arXiv preprint arXiv:2203.11270},
year = {2022}
}