[ Identification | Description | Input parameters | Links ]

The Monochromator_bent_complex Component

A bent crystal monochromator. Based on the model implemented by Jan Šaroun in NIMA 529 (2004) pp 162-165. Mosacity and bending radius can be set.

Identification

• Site:
• Author: Daniel Lomholt Christensen with help from Jan Šaroun
• Origin: ILL/NBI
• Date: 2 August 2025

Description

This component is a more complex implementation of Monochromator_bent.
This component only differs in the fact that it allows and forces the user
to set every single parameter for every single crystal in the crystal array.

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
zwidth	m	Width of each crystal without bending.	NULL
yheight	m	Height of each crystal without bending.	NULL
xthickness	m	Thickness of each crystal without bending.	NULL
radius_x	m	Radius of the circle the monochromator bends on in the plane. Can be negative.	NULL
radius_y	m	Radius of the (very large) circle the monochromator bends on as a side effect of the horizontal bending. The code assumes that it is so small that it does not affect the points of intersection appreciatively of the crystal.	NULL
angle_to_cut_horizontal	degrees	Angle between cut and normal of crystal slab, horizontally	NULL
mosaicity	arcmin	Gaussian mosaicity of the crystal. Always the horizontal mosaicity	NULL
mosaic_anisotropy	1	Anisotropy of the mosaicity, changes vertical mosaicity to be mosaic_anisotropy*mosaicity	NULL
domainthickness	mu-m	Thickness of the crystal domains.	NULL
temperature	K	Temperature of the monochromator in Kelvin.	NULL
plane_of_reflection	"Si400"	The plane of reflection from the material. The list of possible reflections can be seen in the source code.	"Si400"
x_pos	vector	x-Position of each crystal	NULL
y_pos	vector	y-Position of each crystal	NULL
z_pos	vector	z-Position of each crystal	NULL
x_rot	vector	Rotation around x-axis for each crystal	NULL
y_rot	vector	Rotation around y-axis for each crystal	NULL
z_rot	vector	Rotation around z-axis for each crystal NOTE: Rotations happen around x, then y, then z.	NULL
n_crystals		[#] Number of crystals in your array.	1
optimize		Flag to tell if the component should optimize for reflections or not.	0
verbose		Verbosity of the monochromator. Used for debugging.	0
draw_as_rectangles		Draw the monochromators as boxes. DOES NOT WORK WHEN USING _rot parameters.	0

AT (	,	,		) RELATIVE		Generate to clipboard
ROTATED (	,	,		) RELATIVE

Links

• Source code for Monochromator_bent_complex.comp.
• Jan Šaroun NIM A Volume 529, Issue 1-3 (2004), pp162-165

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[ Identification | Description | Input parameters | Links ]

Generated on mcstas 3.6.1

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Last Modified: Friday, 12-Dec-2025 12:58:06 CET