base class, extends NXobject


A device that reduces the intensity of a beam by attenuation.

If uncertain whether to use NXfilter (band-pass filter) or NXattenuator (reduces beam intensity), then choose NXattenuator.


No symbol table

Groups cited:



@default: (optional) NX_CHAR

Declares which child group contains a path leading to a NXdata group.

It is recommended (as of NIAC2014) to use this attribute to help define the path to the default dataset to be plotted. See https://www.nexusformat.org/2014_How_to_find_default_data.html for a summary of the discussion.

distance: (optional) NX_FLOAT {units=NX_LENGTH}

Distance from sample

type: (optional) NX_CHAR

Type or composition of attenuator, e.g. polythene

thickness: (optional) NX_FLOAT {units=NX_LENGTH}

Thickness of attenuator along beam direction

scattering_cross_section: (optional) NX_FLOAT {units=NX_CROSS_SECTION}

Scattering cross section (coherent+incoherent)

absorption_cross_section: (optional) NX_FLOAT {units=NX_CROSS_SECTION}

Absorption cross section

attenuator_transmission: (optional) NX_FLOAT {units=NX_DIMENSIONLESS}

The nominal amount of the beam that gets through (transmitted intensity)/(incident intensity)

status: (optional) NX_CHAR

In or out or moving of the beam

Any of these values: in | out | moving

@time: (optional) NX_DATE_TIME

time stamp for this observation

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