The Fermi chopper spectrometer 4SEASONS at J-PARC

Ryoichi Kajimoto, Mitsutaka Nakamura, Yasuhiro Inamura, Fumio Mizuno, Kenji Nakajima, Seiko Ohira-Kawamura, Tetsuya Yokoo, Takeshi Nakatani, Ryuji Maruyama, Kazuhiko Soyama, Kaoru Shibata, Kentaro Suzuya, Setsuo Sato, Kazuya Aizawa, Masatoshi Arai, Shuichi Wakimoto, Motoyuki Ishikado, Shin Ichi Shamoto, Masaki Fujita, Haruhiro HirakaKenji Ohoyama, Kazuyoshi Yamada, Chul Ho Lee

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75 Citations (Scopus)


4SEASONS is a Fermi chopper spectrometer in operation at the Materials and Life Science Experimental Facility (MLF) in the Japan Proton Accelerator Research Complex (J-PARC). 4SEASONS is expected to facilitate highefficiency measurements of weak inelastic signals on novel spin and lattice dynamics using thermal neutrons. The spectrometer is equipped with a coupled moderator and sophisticated components such as an elliptical converging neutron guide with high-critical-angle supermirrors, long (2.5 m) position-sensitive detectors, and a Fermi chopper appropriate for multiple-incident-energy (multi-E i) measurements by the repetition-rate multiplication technique. Herein, we discuss in detail the design and performance of the spectrometer, and present some examples of the measurements obtained using this spectrometer.

Original languageEnglish
Article numberSB025
JournalJournal of the Physical Society of Japan
Issue numberSUPPL. B
Publication statusPublished - 2011 Dec

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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