Kappa diffractometer

[brussel13]

I wonder if any thought has been put into implementation of Kappa geometry diffractometers. One could imagine specifying an axis with something like "30x+60y+" to represent that the axis lies in the xy plane at 30 degrees to positive x and 60 to positive y? It's possible there is a way to do this already and I have just missed it.

https://journals.iucr.org/j/issues/1999/05/00/gl0599/gl0599.pdf

[dkriegner]

yes there is a way to do this already. The problem is the bad documentation of this and many other features.

Please look at https://github.com/dkriegner/xrayutilities/blob/main/examples/xrayutilities_experiment_kappa.py and see if this explains it sufficiently.

On Wed, Dec 1, 2021 at 4:58 AM brussel13 @.***> wrote:

I wonder if any thought has been put into implementation of Kappa geometry diffractometers. One could imagine specifying an axis with something like "30x+60y+" to represent that the axis lies in the xy plane at 30 degrees to positive x and 60 to positive y? It's possible there is a way to do this already and I have just missed it.

https://journals.iucr.org/j/issues/1999/05/00/gl0599/gl0599.pdf

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[dkriegner]

@brussel13 if the previous comment answers your question, this issue could be closed?

[brussel13]

Dominik,

Yes, I did find the kappa support. Thank you. Is there any consideration of a more general axis definition? Please feel free to close the this.

Ross

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From: Dominik Kriegner @.> Sent: Monday, December 20, 2021 2:26 AM To: dkriegner/xrayutilities @.> Cc: Harder, Ross J. @.>; Mention @.> Subject: Re: [dkriegner/xrayutilities] Kappa diffractometer (Issue #132)

@brussel13https://github.com/brussel13 if the previous comment answers your question, this issue could be closed?

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[dkriegner]

Hi, sorry for late reply.

Is there any consideration of a more general axis definition?

I am not sure if I understand the question. As I see it, one can with the current code define a completely general axis direction. It might need that one adds some fake axis to provide the rotation of the axis but its possible.

I also must omit that non-orthogonal axis is not something I saw often. Since the kappa axis which seems to be the only frequent implemtation is somewhat handles rather easily I see no need for code changes at the moment.

If someone indeed has a goniometer which has multiple weirdly oriented rotation axis one might want to change things a bit. But using some fake axis to provide the tilt of the rotation axis even this can be implemented with the current code (but I agree this is not elegant in this case).

cheers Dominik