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Report No.
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Current status of the 4SEASONS spectrometer at J-PARC

Kajimoto, Ryoichi  ; Yokoo, Tetsuya*; Nakajima, Kenji  ; Nakamura, Mitsutaka; Inamura, Yasuhiro; Soyama, Kazuhiko; Ino, Takashi*; Oyama, Kenji*; Sakai, Makiko; Aizawa, Kazuya; Arai, Masatoshi; Yoshida, Katsuhiko*; Niita, Koji*; Imai, Yoshinori; Kodama, Katsuaki; Asaoka, Hidehito; Shamoto, Shinichi; Hiraka, Haruhiro*; Fujita, Masaki*; Yamada, Kazuyoshi*

4SEASONS is one of the day-one chopper spectrometers for the spallation neutron facility in Japan Proton Accelerator Research Complex (J-PARC). The spectrometer targets high-$$T_c$$ superconductors and related strongly correlated materials utilizing incident energies of 5-300 meV. 4SEASONS supplies high flux at a sample by moderating the resolution ($$Delta E/E_i = 5$$-6% at $$E = 0$$) and incorporating efficient neutron optic devices. A new Fermi chopper is designed to multiply the measurement efficiency by repetition rate multiplication (RRM). Recently, we have decided to enlarge the detector coverage by $$30^{circ}$$ in horizontal direction (with the maximum scattering angle being $$120^{circ}$$) to let the spectrometer have more flexibility. The designing of the vacuum scattering chamber has been almost completed. Examination of the 2.5m-$$^3$$He PSD on neutron beam and manufacturing of a prototype of a slit package of the new chopper are going on.

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