Improvement of neutron spin echo spectrometer at C2-2 of JRR3M

We have improved a neutron spin echo spectrometer at the C2-2 port of JRR-3 M, JAERI. The new double reflection supermirror monochromators with the wav elength lambda = 5.9 Angstrom (Delta lambda/lambda = 15%) and lambda = 7.14 Angstrom (Delta lambda/lambda = 18%) increased the polarized neutron flux at the sample position about three times more than the old monochromator. T he deflection angle 2 theta(M) at C2-2 port increased up to 7.00 degrees us ing 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 replac ed the spiral coils with a wider one and installed a new detector system wi th an assembly of eight one-dimensional PSDs, (C) 1999 Elsevier Science Ltd . All rights reserved.