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9.13 The Res_sample McStas Component
Sample for resolution function calculation.
Identification
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Author: Kristian Nielsen
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Origin: Risoe
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Date: 1999
Description
An inelastic sample with completely uniform scattering in both Q and energy. This sample is used together with the Res_monitor component and (optionally) the mcresplot front-end to compute the resolution function of triple-axis or inverse-geometry time-of-flight instruments.
The shape of the sample is either a hollow cylinder or a rectangular box. The hollow cylinder shape is specified with an inner and outer radius. The box is specified with dimensions xwidth, yheight, zdepth.
The scattered neutrons will have directions towards a given disk and energies betweed E0-dE and E0+dE. This target area may also be rectangular if specified focus_xw and focus_yh or focus_aw and focus_ah, respectively in meters and degrees. The target itself is either situated according to given coordinates (x,y,z), or setting the relative target_index of the component to focus at (next is +1). This target position will be set to its AT position. When targeting to centered components, such as spheres or cylinders, define an Arm component where to focus at.
Example: Res_sample(thickness=0.001,radius=0.02,yheight=0.4,focus_r=0.05, E0=14.6,dE=2, target_x=0, target_y=0, target_z=1)
Input parameters
Parameters in boldface are required; the others are optional.
|
Name |
Unit |
Description |
Default |
|
|
|||
|
thickness |
m |
Thickness of hollow cylinder in (x,z) plane |
0 |
|
radius |
m |
Outer radius of hollow cylinder |
0.01 |
|
focus_r |
m |
Radius of sphere containing target. |
0.05 |
|
E0 |
meV |
Center of scattered energy range |
14 |
|
dE |
meV |
half width of scattered energy range |
2 |
|
target_x |
m |
X-position of target to focus at [m] |
0 |
|
target_y |
m |
Y-position of target to focus at |
0 |
|
target_z |
m |
Z-position of target to focus at [m] |
.5 |
|
focus_xw |
m |
horiz. dimension of a rectangular area |
0 |
|
focus_yh |
m |
vert. dimension of a rectangular area |
0 |
|
focus_aw |
deg |
horiz. angular dimension of a rectangular area |
0 |
|
focus_ah |
deg |
vert. angular dimension of a rectangular area |
0 |
|
xwidth |
m |
horiz. dimension of sample, as a width |
0 |
|
yheight |
m |
vert. dimension of sample, as a height |
0.05 |
|
zdepth |
m |
depth of sample |
0 |
|
target_index |
1 |
relative index of component to focus at, e.g. next is +1 |
0 |
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Links
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Component source code found in file Res_sample.comp.
