[mcstas-users] monochromator curvature issue

[陈彦舟]

Dear all,

In the simulation of monochromator_curved, the curvatures approximation for parallel beam focusing to distance L with monochromator rotation angle A1 are:
RV=2*L*sin(DEG2RAD*A1);
RH=2*L/sin(DEG2RAD*A1);
However, in reality, the incoming neutron beam has a certain divergence. My question is how  to define the curvatures of the monochromator considering the divergence?

Best regards,
Tom
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