Current status and grade-up plan of DNA backscattering neutron spectrometer at MLF, J-PARC

Kawakita, Yukinobu  ; Matsuura, Masato*; Tominaga, Taiki*; Yamada, Takeshi*; Kobayashi, Makoto*; Nakagawa, Hiroshi   

The ToF back scattering spectrometer, DNA, installed at the BL02 of MLF in J-PARC, is a tool for quasi-elastic and inelastic neutron scattering. DNA is a unique back-scattering spectrometer with a pulse shaping chopper with maximum rotation speed of 300 Hz. After scattered by the measuring sample, neutrons only with 2.08 meV are selected by Si111 analyzer mirrors. High efficiency and high signal-to-noise ratio are achieved to detect weak signals in inelastic energy region by analyzer mirrors coated with a Gd neutron absorber on the rear of a Si wafer. The subjects of DNA are atomic and spin dynamics ranged from pico to nano second order in bio-molecules, softmatters, and solid state materials such as ionic conductors including batteries and strongly-correlated electron system. In this presentation, in addition of specification of DNA spectrometer, grade-up activities including commissioning work of new analyzer mirrors Si311 and so on will be introduced.