4.3.1.30. NXmirror¶
Status:
base class, extends NXobject
Description:
A beamline mirror or supermirror.
Symbols:
No symbol table
- Groups cited:
NXdata, NXgeometry, NXoff_geometry, NXshape, NXtransformations
Structure:
@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.
type: (optional) NX_CHAR
Any of these values:
single: mirror with a single material as a reflecting surface
multi: mirror with stacked, multiple layers as a reflecting surfacedescription: (optional) NX_CHAR
description of this mirror
incident_angle: (optional) NX_FLOAT {units=NX_ANGLE}
bend_angle_x: (optional) NX_FLOAT {units=NX_ANGLE}
bend_angle_y: (optional) NX_FLOAT {units=NX_ANGLE}
interior_atmosphere: (optional) NX_CHAR
Any of these values:
vacuum|helium|argonexternal_material: (optional) NX_CHAR
external material outside substrate
m_value: (optional) NX_FLOAT {units=NX_UNITLESS}
The m value for a supermirror, which defines the supermirror regime in multiples of the critical angle of Nickel.
substrate_material: (optional) NX_CHAR
substrate_density: (optional) NX_FLOAT {units=NX_MASS_DENSITY}
substrate_thickness: (optional) NX_FLOAT {units=NX_LENGTH}
coating_material: (optional) NX_CHAR
substrate_roughness: (optional) NX_FLOAT {units=NX_LENGTH}
coating_roughness: (optional) NX_FLOAT {units=NX_LENGTH}
even_layer_material: (optional) NX_CHAR
even_layer_density: (optional) NX_FLOAT {units=NX_MASS_DENSITY}
odd_layer_material: (optional) NX_CHAR
odd_layer_density: (optional) NX_FLOAT {units=NX_MASS_DENSITY}
layer_thickness: (optional) NX_FLOAT {units=NX_LENGTH}
An array describing the thickness of each layer
depends_on: (optional) NX_CHAR
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.
Given a flat mirror, the reference plane is the plane which contains the “entry” surface of the mirror. The reference point of the mirror in the x and y axis is the centre of the mirror on that plane. The reference plane is orthogonal to the z axis and the location of this plane is the reference point on the z axis. The mirror faces negative z values.
GEOMETRY: (optional) NXgeometry
DEPRECATED: Use the field depends_on and NXtransformations to position the mirror and NXoff_geometry to describe its shape instead
reflectivity: (optional) NXdata
Reflectivity as function of wavelength
shape: (optional) NXshape
DEPRECATED: Use NXoff_geometry instead
A NXshape group describing the shape of the mirror
figure_data: (optional) NXdata
Numerical description of the surface figure of the mirror.
OFF_GEOMETRY: (optional) NXoff_geometry
This group describes the shape of the beam line component
TRANSFORMATIONS: (optional) NXtransformations
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.
Hypertext Anchors¶
List of hypertext anchors for all groups, fields, attributes, and links defined in this class.