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High intensity chopper spectrometer 4SEASONS at J-PARC

Kajimoto, Ryoichi  ; Yokoo, Tetsuya*; Nakajima, Kenji  ; Nakamura, Mitsutaka; Soyama, Kazuhiko; Ino, Takashi*; Shamoto, Shinichi; Fujita, Masaki*; Oyama, Kenji*; Hiraka, Haruhiro*; Yamada, Kazuyoshi*; Arai, Masatoshi

We are developing a new chopper-type neutron inelastic spectrometer 4SEASONS for the spallation neutron source at J-PARC. This spectrometer has middle energy resolution and two orders higher efficiency than the ones at ISIS for a single crystal measurement. With this spectrometer, we try to explore novel quantum phenomena, in particular, the mechanism of the high-$$T_c$$ superconductivity. The high flux at a sample is achieved by incorporating the well designed transport devices in addition to the high flux of the source. The energy resolution is estimated to be 5-6% at $$hbaromega$$ = 0. Furthermore, the most distinguishing feature of 4SEASONS is the availability of the repetition rate multiplication (RRM) method. The RRM method enables us to utilize many $$E_i$$'s at the same time, which will increase the efficiency of the measurement more than five times and make the survey of 4D space of $$mathbf{Q}$$-$$omega$$ much easier.

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