double_rowland_from_channel_distance

marxs.design.rowland.double_rowland_from_channel_distance(d_BF, R, f)

This prescription is borne out of the engineering needs where it turns out that the spacing between channels d_BF is actually an important parameter so it makes sense to use that here to parameterize the torus, too.

f is the distance between a theoretical on-axis CAT grating and the focal point. It’s default is a little smaller than 12 m, to leave space to mount the SPOs.

Parameters

d_BFfloat

Distance between the optical axes of two channels measured in the dispersion direction.

Rfloat

Radius of Rowland torus.

ffloat

Distance between a theoretical on-axis CAT grating and the focal point.

Returns

geometrydict

Dictionary with the keys that hold the input parameters, derived dimensions of the geometry, and the constructed Rowland tori. Three Rowland tori are constructed: One for each channel called (rowland_central, rowland_central_m) and one for the detector (rowland_detector).