Micro-spot high resolution beamline of PLS: outside order SGM with moving entrance slit

A new design of spherical grating monochromator is proposed which uses the outside diffraction order and the entrance slit translation during the photon energy scan. This design has been studied by means of analytical calculation and ray-tracing. The resolving power of this monochromator is somewhat higher than that of DRAGON and the fixed exit slit allows the downstream refocusing mirrors to make a micro spot at the sample position.