Cylindrical Beam Stopper

[kklmn]

Cylindrical Beam Stopper

[kklmn]

Hi,

If the question is about making a beam stop then it can be implemented by RoundBeamStop class from
xrt.backends.raycing.apertures.
If you ask about geometry/alignment then please better explain the problem.

Also, be advised that you can create a conic ring source by specifying distxprime or distzprime = 'annulus' so that you illuminate only your crystal and not the inner cone in the HOPG cylinder (I suppose it is a whole cylinder).

[kklmn]

RoundBeamStop wasn't documented. Now it is.

[ts8guest]

Thank you for your response.
At the beginning, I implemented the HOPG cylinder with two RoundBeamStops at the both sides of the cylinder. But, there is a cylindrical beam stopper inside the real HOPG monochromator. Furthermore, I would like to implement a source with some values of dx and dz (not a point source). I understand the specification of distx or distz = 'annulus' in the case of a point source, but for source-disc definition can I apply the same without implementation of a cylindrical beam stopper?

[kklmn]

You can give independent specifications for size (distx, distz, dx, dz) and divergence (distxprime, distzprime, dxprime, dzprime). So you can define a cone with a hole in it with distxprime or distzprime = 'annulus' while in linear dimensions the source can be a flat or a Gaussian spot.

A conic source with an annulus distribution is more efficient, as you don't waste the rays which are not supposed to come to the crystal. In order to mimic reality, you may still want to add beamstops, as present in your physical setup.

[ts8guest]

Thank you very much! I have one more question.
I would like to define a source with discrete energies and associated relative probabilities. Would it be correct to add a new energy distribution in 'xrt.backends.raycing.sources.make_energy' given by a function 'random.choices(energies, probabilities)'?

[kklmn]

please make a new issue with it