[ Identification | Description | Input parameters | Links ]

The `Bragg_crystal_bent_BC` Component

* * Bent, perfect, reflecting crystal with common cubic structures (diamond, fcc, or bcc, and others if symmetry form factor multipliers provided explicitly) * *

Identification

Site:
Author: Marcus H Mendenhall, NIST
Origin: Marcus H. Mendenhall, NIST, Gaithersburg, MD, USA
Date: December 1, 2016

Description

* Bragg_crystal_bent_BC.comp is intended to supercede Bragg_crystal_bent.comp.
*
* For details see:
* The optics of focusing bent-crystal monochromators on X-ray powder diffractometers
*   with application to lattice parameter determination and microstructure analysis,
*   Marcus H. Mendenhall,* David Black and James P. Cline, J. Appl. Cryst. (2019). 52,
*   https://doi.org/10.1107/S1600576719010951
*
* NOTE: elliptical coordinate code and documentation taken from Mirror_elliptic.comp
* distributed in McXtrace v1.2. However, the coordinates are rotated to be consistent
* with Bragg_crystal_flat.comp and Perfect_Crystal.comp. Idealized elliptic mirror
* with surface ellipse and lattice ellipses independent, to allow construction of
* Johansson optics, for example.
*
*

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
x_a			0
y_b			1.0
z_c			1.0
lattice_x_a			0
lattice_y_b			1.0
lattice_z_c			1.0
length			0.05
width			0.02
V			160.1826
form_factors			"FormFactors.txt"
material			"Si.txt"
alpha			0.0
R0			0
debye_waller_B			0.4632
crystal_type			1
h			1
k			1
l			1
structure_factor_scale_r			0.0
structure_factor_scale_i			0.0

AT (	,	,		) RELATIVE
ROTATED (	,	,		) RELATIVE

The Bragg_crystal_bent_BC Component

Identification

Description

Input parameters

Links

The `Bragg_crystal_bent_BC` Component