The Performance of TOF near Backscattering Spectrometer DNA in MLF, J-PARC

• DOI: 10.7566/jpscp.8.036022
• Publication Date: 2015-09-25T07:17:55Z
• Authors: Kaoru Shibata; Nobuaki Takahashi; Yukinobu Kawakita; Masato Matsuura; Takeshi Yamada; Taiki Tominaga; Wataru Kambara; Makoto Kobayashi; Yasuhiro Inamura; Takeshi Nakatani; Kenji Nakajima; Masatoshi Arai
• Keywords: J-PARC

The time-of-flight (TOF) type near-backscattering spectrometer (n-BSS), DNA, with Si crystal analyzers was built and started operation in 2012 at the Materials Life Science Experimental Facility (MLF) of Japan Proton Accelerator Research Complex (J-PARC). DNA is first n-BSS pulse shaping chopper installed a spallation pulsed neutron source. It offers currently highest energy-resolution about 2.4 micro eV by operating double-disk 225 Hz whose phase optimized to narrowest slit 10 mm width. Energy resolution can be flexibly compromised intensity during experiment using two slits different widths changing copper frequency. An example measurement high under condition that operated shown, where limited measurable energy range widely expanded multi incident band technique. experimental data demonstrate extremely signal-to-noise ratio (~10 5 ) this spectrometer.