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McStas: Spherical_Backscattering_Analyser Component

[ Identification | Description | Input parameters | Output parameters | Links ]

The Spherical_Backscattering_Analyser Component


  • Author: Nikolaos Tsapatsaris (with help from Peter Willendrup, Ruep Lechner, Heloisa Bordallo)
  • Origin: Niels Bohr Institute
  • Date: 2015
  • Version:(Unknown)


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.

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)

WARNING: This is a contributed Component.

Input parameters

Parameters in boldface are required; the others are optional.
Name Unit Description Default
xmin 0
xmax m Maximum absolute value of x =~ 0.5 * Width of the monochromator 0
ymin 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 AA-1 Magnitude of scattering vector 2.003886241
DM - = 2*PI/mono_Q; d_rms = dspread*DM/sqrt(8*log(2)); 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

Output parameters

Name Unit Description Default
mono_Q - = Q; if (DM != 0) mono_Q = 2*PI/DM;  


  • Source code for Spherical_Backscattering_Analyser.comp.

[ Identification | Description | Input parameters | Output parameters | Links ]

Generated automatically by McDoc, Peter Willendrup <> / Wed Jan 12 15:13:31 2022

Last Modified: Wednesday, 12-Jan-2022 16:13:31 CET
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