According to the demand of beamline and the current research subject

we upgraded the BSRF-4W1A beamline. During the upgrade

the azimuthal angle of 4W1A with respect to the wiggler was redesigned

a new double crystal monochromator with fixed exit was designed

the upside cooling mode of the monochromator’s first crystal was proposed. By ray-tracing calculation

the flux at the commonly used energy 8 keV is promised to increase to 3.6 times

and the energy is promised to expand from 8 keV to 19.6 keV under the condition of the same flux.