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14.55 The Spherical_Backscattering_Analyser McStas Component
Spherical backscattering analyser
Identification
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Author: Nikolaos Tsapatsaris with P Willendrup, R Lechner, H Bordallo
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Origin: NBI/ESS
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Date: 2015
Description
Spherical backscattering analyser with variable reflectivity, and mosaic gaussian response.
Based on earlier developments by Miguel A. Gonzalez 2000, Tilo Seydel 2007, Henrik Jacobsen 2011.
Example: COMPONENT doppler = Spherical_Backscattering_Analyser( xmin=0, xmax=0, ymin=0, ymax=0, mosaic=21.0, dspread=0.00035, Q=2.003886241, DM=0, radius=2.5, f_doppler=0, A_doppler=0, R0=1, debug=0)
Input parameters
Parameters in boldface are required; the others are optional.
|
Name |
Unit |
Description |
Default |
|
|
|||
|
xmin |
m |
Minimum absolute value of x =~ 0.5 * Width of the monochromator |
0 |
|
xmax |
m |
Maximum absolute value of x =~ 0.5 * Width of the monochromator |
0 |
|
ymin |
m |
Minimum absolute value of x =~ 0.5 * Width of the monochromator |
0 |
|
ymax |
m |
Maximum absolute value of y =~ 0.5 * Height of the monochromator |
0 |
|
mosaic |
arc min |
Mosaicity, FWHM |
21.0 |
|
dspread |
1 |
Relative d-sprea, FWHM |
0.00035 |
|
Q |
Å\(^{-1}\) |
Magnitude of scattering vector |
2.003886241 |
|
DM |
Å |
monochromator d-spacing instead of Q = 2*pi/DM |
0 |
|
radius |
m |
Curvature radius |
2.5 |
|
f_doppler |
Hz |
Frequency of doppler drive |
0 |
|
A_doppler |
m |
Amplitude of doppler drive |
0 |
|
R0 |
1 |
Scalar, maximum reflectivity of neutrons |
1 |
|
debug |
1 |
if debug > 0 print out some info about the calculations |
0 |
|
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Links
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Component source code found in file Spherical_Backscattering_Analyser.comp.
