Figure 4
(a) Time diagram for 60 Hz operations for a source-to-detector distance of 19 m. The choppers are phased to the second frame (3.47–6.94 Å). The three choppers are labeled T1, T2, T3a and T3b. (b) The harmonics of neutron bands that can pass through the choppers. The higher frame harmonics, or leakages, will be eliminated from the neutron beam by a frame overlap mirror. For simplicity, the dimensions of the beam cross section and neutrons coming from the tail end of the source pulse are not considered in this diagram. |