Sample for TOF resolution function calculation.
Author: KL, 10 October 2004
Origin: Risoe
Date: 1999
An inelastic sample with completely uniform scattering in both solid angle and energy. This sample is used together with the TOFRes_monitor component and (optionally) the mcresplot front-end to compute the resolution function of all time-of-flight instruments. The method of time focusing is used to optimize the simulations.
The shape of the sample is either: 1. Hollow cylinder (Please note that the cylinder **must** be specified with both a radius and a wall-thickness!) 2. A massive, rectangular box specified with dimensions xwidth, yheight, zdepth. (i.e. **withouht** a thickness)
hollow cylinder shape **must** be specified with both a radius and a wall-thickness. The box is
The scattered neutrons will have directions towards a given target and detector arrival time in an interval of time_width centered on time_bin. This target area is default disk shaped, but 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: TOFRes_sample(thickness=0.001, radius=0.01, yheight=0.04, focus_xw=0.025, focus_yh=0.025, time_bin=3e4, time_width=200, target_x=0, target_y=0, target_z=1)
Parameters in boldface are required; the others are optional.
|
Name |
Unit |
Description |
Default |
|
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|
thickness |
m |
Thickness of hollow cylinder in (x,z) plane |
0 |
|
radius |
m |
Outer radius of hollow cylinder |
0.01 |
|
yheight |
m |
vert. dimension of sample, as a height |
0.05 |
|
focus_r |
m |
Radius of sphere containing target |
0.05 |
|
time_bin |
us |
position of time bin |
20000 |
|
time_width |
us |
width of time bin |
10 |
|
f |
1 |
Adaptive time-shortening factor |
50 |
|
target_x |
|
|
0 |
|
target_y |
m |
position of target to focus at |
0 |
|
target_z |
|
|
.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 |
|
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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Component source code found in file TOFRes_sample.comp.