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NXbeam: clarify how beams can be in either sample or instrument groups #1283

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Jun 21, 2023
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NXbeam: clarify how beams can be in either sample or instrument groups #1283

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78699c6
Update NXbeam.nxdl.xml
Gigarrum Jun 19, 2023
f6de34a
Add suggested change to NXbeam.nxdl.xml
Gigarrum Jun 21, 2023
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5 changes: 4 additions & 1 deletion base_classes/NXbeam.nxdl.xml
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Expand Up @@ -48,7 +48,10 @@
especially valuable in storing the results of instrument simulations in which it is useful
to specify the beam profile, time distribution etc. at each beamline component. Otherwise,
its most likely use is in the :ref:`NXsample` group in which it defines the results of the neutron
scattering by the sample, e.g., energy transfer, polarizations.
scattering by the sample, e.g., energy transfer, polarizations. Finally, There are cases where the beam is
considered as a beamline component and this group may be defined as a subgroup directly inside
:ref:`NXinstrument`, in which case it is recommended that the position of the beam is specified by an
:ref:`NXtransformations` group, unless the beam is at the origin (which is the sample).

Note that incident_wavelength and related fields can be a scalar values or arrays, depending on the use case.
To support these use cases, the explicit dimensionality of these fields is not specified, but it can be inferred
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