Current status and upgrade plan of neutron backscattering spectrometer DNA

中性子後方散乱分光器DNAの現状と高度化計画

川北 至信  ; 松浦 直人*; 富永 大輝*; 山田 武*; 玉造 博夢   ; 中川 洋   ; 大内 啓一*

Kawakita, Yukinobu; Matsuura, Masato*; Tominaga, Taiki*; Yamada, Takeshi*; Tamatsukuri, Hiromu; Nakagawa, Hiroshi; Ouchi, Keiichi*

DNA is a TOF type Si crystal analyzer backscattering spectrometer installed at the Japan Proton Accelerator Research Complex (J-PARC) spallation source. DNA uses a pulse-shaping chopper to extract sharp pulsed neutron from strong but broad spectrum of coupled moderator, which achieves good energy resolution (~2.4 micro-eV) and large neutron flux simultaneously. In addition, time-of-flight technique allows us to go high energy transfers of about 1500 micro-eV. Furthermore, the signal-to-noise ratio at DNA achieves 10, which enables to covers a variety of research fields from biomaterials with small scattering amplitudes or with small quantities of samples (of the order of milligrams). DNA has Si111 analyzers, which allows to access momentum transfer range from 0.08 to 1.86 . Currently, we are installing Si311 analyzers covering momentum transfer from 1.79 to 3.39 , which overlaps Q-region of Si111. We are developing various sample environments, such as magnet, automatic sample changers, furnace, humidity controller, and radial collimators. We are also promoting the Internet of Things (IoT) of the equipment due to strong demands of remote experiments from COVID-19. We will show the current status and upgrade plan of DNA.