Abstract
Abstract We have improved a neutron spin echo spectrometer at the C2-2 port of JRR-3M, JAERI. The new double reflection supermirror monochromators with the wavelength λ =5.9 A (Δ λ / λ =15%) and λ =7.14 A (Δ λ / λ =18%) increased the polarized neutron flux at the sample position about three times more than the old monochromator. The deflection angle 2 θ M at C2-2 port increased up to 7.00° using double reflection, which reduced the disturbance from the iron cover of C2 guide for C2-3 port. In order to gain more neutron intensity, we replaced the spiral coils with a wider one and installed a new detector system with an assembly of eight one-dimensional PSDs.
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