[Nexus] Using NXxas for XMCD experiments

[Fernan Saiz]

Dear Steve,

Yes, I agree with you. It would be probably 'enough' to add the fields 
*flux *and *incident_polarization *of the magnetic field from NXbeam to 
NXsample. NXbeam is for the incident photons.

Regards,

  - Fernan

On 3/16/23 10:58, Collins, Steve (DLSLtd,RAL,SCI) via NeXus wrote:
>
> Dear Fernan,
>
> That sounds sensible in as far as XMCD (and XMLD) is XAS with 
> different values for field and/or polarization, both of which are 
> documented.
>
> We have an issue with magnetic_field in that the possible directions 
> are currently very restricted. This probably needs to be changed.
>
> Regards,
>
> Steve
>
> *From:*NeXus <nexus-bounces at shadow.nd.rl.ac.uk> *On Behalf Of *Fernan 
> Saiz via NeXus
> *Sent:* 16 March 2023 09:37
> *To:* nexus at nexusformat.org
> *Cc:* Fernan Saiz <fsaiz at cells.es>
> *Subject:* [Nexus] Using NXxas for XMCD experiments
>
> Dear Nexus community,
>
> I was wondering if any member here has been used NXxas 
> <https://manual.nexusformat.org/classes/applications/NXxas.html> for 
> XMCD experiments given that XMCD can be assumed to be the difference 
> of two XAS spectra obtained under plus and minus magnetic fields and 
> divided their sum. The reason behind my question is that I see much 
> simpler to add the information about the magnetic field by filling out 
> e.g. *magnetic**_field *in the NXsample rather than coming up with a 
> new application definition. The former option can be also complemented 
> by providing information about the magnet (e.g. NXquadrupole_magnet).
>
> Any thoughts would be welcomed.
>
> Sincerely,
>
> -- 
>
> <https://www.albasynchrotron.es/en/>
>
> 	
>
> *Fernan Saiz, PhD *
>
> Scientific Data Management Engineering - Computing Division
>
> *ALBA SYNCHROTRON LIGHT SOURCE*
>
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