Energy resolution and neutron flux of the 4SEASONS spectrometer revisited

Kajimoto, Ryoichi; Nakamura, Mitsutaka; Iida, Kazuki; Kamazawa, Kazuya; Ikeuchi, Ken; Inamura, Yasuhiro; Ishikado, M.

doi:10.3233/jnr-200146

Cited by 2 publications

(1 citation statement)

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“…However, the energy resolution at low energy transfers may be insufficient with the above condition. This is because the contribution of the Fermi chopper to energy resolution increases substantially at low energy transfers [19,20]. This further limits the usability of the instrument, even though the low energy transfer region can be covered by lower E i s available via the RRM.…”

Section: Fermi Chopper and Optimum Resolutionmentioning

confidence: 99%

Possible future upgrades of the direct-geometry chopper spectrometer 4SEASONS

et al. 2022

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4SEASONS is a direct geometry time-of-flight spectrometer installed in the Materials and Life Science Experimental Facility, the Japan Proton Accelerator Research Complex. It is used to study atomic and spin dynamics in the energy range of 100 meV to 102 meV. Since more than a decade has crossed after the first inelastic scattering experiment, it is essential to consider upgrading the instrument to improve its flexibility and performance. In this paper, we discuss the possible medium-term upgrades of key components of the instrument like the chopper system, which are achievable with the current technology and at reasonable cost. Herein, we demonstrated that 4SEASONS can improve the energy resolution by a factor of two, remove frame overlap of adjacent incident energies, significantly improve the asymmetry in the pulse shape, and increase the flux by a factor of ∼1.5, without major technical difficulties.

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Section: Fermi Chopper and Optimum Resolutionmentioning

confidence: 99%