3.3.1.1. NXaperture¶
Status:
base class, extends NXobject
Description:
A beamline aperture. ...
A beamline aperture.
Note, the group was incorrectly documented as deprecated, but it is not and it is in common use.
You can specify the geometry of the aperture using either NXoff_geometry or for simpler geometry shape and size.
Symbols:
No symbol table
- Groups cited:
NXgeometry, NXnote, NXoff_geometry, NXpositioner, NXtransformations
Structure:
@default: (optional) NX_CHAR
Declares which child group contains a path leading ...
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.
depends_on: (optional) NX_CHAR
NeXus positions components by applying a set of translations and rotations ...
NeXus positions components by applying a set of translations and rotations to apply to the component starting from 0, 0, 0. The order of these operations is critical and forms what NeXus calls a dependency chain. The depends_on field defines the path to the top most operation of the dependency chain or the string “.” if located in the origin. Usually these operations are stored in a NXtransformations group. But NeXus allows them to be stored anywhere.
The reference point of the aperture is its center in the x and y axis. The reference point on the z axis is the surface of the aperture pointing towards the source.
In complex (asymmetric) geometries an NXoff_geometry group can be used to provide an unambiguous reference.
material: (optional) NX_CHAR
Absorbing material of the aperture
description: (optional) NX_CHAR
Description of aperture
shape: (optional) NX_CHAR
Shape of the aperture. ...
Shape of the aperture.
Any of these values:
straight slit
curved slit
pinhole
circle
square
hexagon
octagon
bladed
open
gridsize: (optional) NX_NUMBER {units=NX_LENGTH}
The relevant dimension for the aperture, i.e. slit width, pinhole and iris ...
The relevant dimension for the aperture, i.e. slit width, pinhole and iris diameter
TRANSFORMATIONS: (optional) NXtransformations
This is the group recommended for holding the chain of translation ...
This is the group recommended for holding the chain of translation and rotation operations necessary to position the component within the instrument. The dependency chain may however traverse similar groups in other component groups.
OFF_GEOMETRY: (optional) NXoff_geometry
Use this group to describe the shape of the aperture.
POSITIONER: (optional) NXpositioner
Stores the raw positions of aperture motors.
GEOMETRY: (optional) NXgeometry
DEPRECATED: Use the field depends_on and NXtransformations to position the aperture and NXoff_geometry to describe its shape
Location and shape of aperture ...
Location and shape of aperture
BLADE_GEOMETRY: (optional) NXgeometry
DEPRECATED: Use NXoff_geometry instead to describe the shape of the aperture
location and shape of each blade
NOTE: (optional) NXnote
Describe any additional information in a note.
Hypertext Anchors¶
List of hypertext anchors for all groups, fields, attributes, and links defined in this class.