Spallation ultracold neutron source of superfluid helium below 1 K |
| |
Authors: | Masuda Yasuhiro Hatanaka Kichiji Jeong Sun-Chan Kawasaki Shinsuke Matsumiya Ryohei Matsuta Kensaku Mihara Mototsugu Watanabe Yutaka |
| |
Affiliation: | High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan. |
| |
Abstract: | For the production of high-density ultracold neutrons (UCNs), we placed 0.8 K superfluid helium in a cold neutron moderator. We resolved previous heat-load problems in the spallation neutron source that were particularly serious below 1 K. With a proton-beam power of 400 MeV×1 μA, a UCN production rate of 4 UCN cm(-3) s(-1) at the maximum UCN energy of E(c)=210 neV and a storage lifetime of 81 s were obtained. A cryogenic test showed that the production rate can be increased by a factor of 10 with the same storage lifetime by increasing the proton-beam power as well as (3)He pumping speed. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|