Radial Soller collimator with rectangular opening, specified length and
specified foil thickness.
The collimator is made of many trapezium shaped nslit stacked radially.
The nslit are separated by absorbing foils, the whole stuff is inside
an absorbing housing.
The component should be positioned at the radius center. The model is exact.
The neutron beam outside the collimator area is transmitted unaffected.
Example: Exact_radial_coll(theta_min=-5, theta_max=5, nslit=100,
radius=1.0, length=.3, h_in=.2, h_out=.3, d=0.0001)
WARNING: This is a contributed Component.
Parameters in boldface are required;
the others are optional.