Spallation Ultracold Neutron Source of Superfluid Helium below 1 K

被引：51

作者：

Masuda, Yasuhiro ^{[1
]}

Hatanaka, Kichiji ^{[2
]}

Jeong, Sun-Chan ^{[1
]}

Kawasaki, Shinsuke ^{[1
]}

Matsumiya, Ryohei ^{[2
]}

Matsuta, Kensaku ^{[3
]}

Mihara, Mototsugu ^{[3
]}

Watanabe, Yutaka ^{[1
]}

机构：

[1] High Energy Accelerator Res Org, Tsukuba, Ibaraki 3050801, Japan

[2] Osaka Univ, RCNP, Osaka 5670047, Japan

[3] Osaka Univ, Grad Sch Sci, Toyonaka, Osaka 5600043, Japan

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 13期

关键词：

COLD NEUTRONS; LIQUID-HELIUM; HE-4; UCN;

D O I：

10.1103/PhysRevLett.108.134801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 x 1 mu A, 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 He-3 pumping speed.

引用

页数：4

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