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12.2 The Bragg_crystal_simple McXtrace Component
Perfect Bragg reflecting slab
Identification
-
Author: Jose I. Robledo
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Origin: FaMAF - UNC, Argentina
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Date: February 2016
Description
Rectangle of matter perfectly reflecting the incident X-ray beam that fulfills Bragg’s law for a set of scattering vectors in the vicinity of the theoretical Q given a d-spacing. The rectangle is in the x-y plane.
Example: Bragg_crystal_simple( yheight=0.05, xwidth=0.02, DM=3.1356, err_Q= 0.000075, r0=1.0)
Input parameters
Parameters in boldface are required; the others are optional.
|
Name |
Unit |
Description |
Default |
|
|
|||
|
xmin |
m |
Lower x bound (overridden by xwidth/yheight) |
1.0 |
|
xmax |
m |
Upper x bound (overridden by xwidth/yheight) |
1.0 |
|
ymin |
m |
Lower y bound (overridden by xwidth/yheight) |
1.0 |
|
ymax |
m |
Upper y bound (overridden by xwidth/yheight) |
1.0 |
|
xwidth |
m |
Width in the x direction |
0.0 |
|
yheight |
m |
Height in the y direction |
0.0 |
|
r0 |
|
Maximum reflectivity |
1 |
|
DM |
Å\(^{-1}\) |
d-spacing of the crystal |
0 |
|
err_Q |
|
dQ/Q relative error of the modulus of Q vector. Approximates the Darwin width of the crystal. |
0.0001 |
|
|
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Links
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Component source code found in file Bragg_crystal_simple.comp.
