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14.12 The Guide_curved McStas Component
Non-focusing curved neutron guide.
Identification
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Author: Ross Stewart
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Origin: <a href="http://www.ill.fr">ILL (France)</a>.
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Date: November 18 2003
Description
Models a rectangular curved guide tube with entrance centered on the Z axis. The entrance lies in the X-Y plane. Draws a true depiction of the guide, and trajectories. Guide is not focusing.
Example: Guide_curved(w1=0.1, h1=0.1, l=2.0, R0=0.99, Qc=0.021, alpha=6.07, m=2, W=0.003, curvature=2700)
%BUGS This component does not work with gravitation on. Use component Guide_gravity then. Systematic error on transmitted flux is found to be about 10%.
Input parameters
Parameters in boldface are required; the others are optional.
|
Name |
Unit |
Description |
Default |
|
|
|||
|
w1 |
m |
Width at the guide entry |
|
|
h1 |
m |
Height at the guide entry |
|
|
l |
m |
length of guide |
|
|
R0 |
1 |
Low-angle reflectivity |
0.995 |
|
Qc |
Å\(^{-1}\) |
Critical scattering vector |
0.0218 |
|
alpha |
Å |
Slope of reflectivity |
4.38 |
|
m |
1 |
m-value of material. Zero means completely absorbing. |
2 |
|
W |
Å\(^{-1}\) |
Width of supermirror cut-off |
0.003 |
|
curvature |
m |
Radius of curvature of the guide |
2700 |
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Links
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Component source code found in file Guide_curved.comp.
