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11.8 The SasView_broad_peak McXtrace Component
SasView broad_peak model component as sample description.
Identification
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Author: Jose Robledo
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Origin: FZJ / DTU / ESS DMSC
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Date:
Description
SasView_broad_peak component, generated from broad_peak.c in sasmodels.
Example: SasView_broad_peak(porod_scale, porod_exp, peak_scale, correlation_length, peak_pos, width_exp, shape_exp, model_scale=1.0, model_abs=0.0, xwidth=0.01, yheight=0.01, zdepth=0.005, R=0, int target_index=1, target_x=0, target_y=0, target_z=1, focus_xw=0.5, focus_yh=0.5, focus_aw=0, focus_ah=0, focus_r=0, pd_correlation_length=0.0)
Input parameters
Parameters in boldface are required; the others are optional.
|
Name |
Unit |
Description |
Default |
|
|
|||
|
porod_scale |
|
([-inf, inf]) Power law scale factor. |
1e-05 |
|
porod_exp |
|
([-inf, inf]) Exponent of power law. |
3.0 |
|
peak_scale |
|
([-inf, inf]) Scale factor for broad peak. |
10.0 |
|
correlation_length |
Å |
([-inf, inf]) screening length. |
50.0 |
|
peak_pos |
1/Å |
([-inf, inf]) Peak position in q. |
0.1 |
|
width_exp |
|
([-inf, inf]) Exponent of peak width. |
2.0 |
|
shape_exp |
|
([-inf, inf]) Exponent of peak shape. Optional parameters: |
1.0 |
|
model_scale |
|
Global scale factor for scattering kernel. For systems without inter-particle interference, the form factors can be related to the scattering intensity by the particle volume fraction. |
1.0 |
|
model_abs |
|
Absorption cross section density at 2200 m/s. |
0.0 |
|
xwidth |
m |
([-inf, inf]) Horiz. dimension of sample, as a width. |
0.01 |
|
yheight |
m |
([-inf, inf]) vert . dimension of sample, as a height for cylinder/box |
0.01 |
|
zdepth |
m |
([-inf, inf]) depth of sample |
0.005 |
|
R |
m |
Outer radius of sample in (x,z) plane for cylinder/sphere. |
0 |
|
target_x |
m |
relative focus target position. |
0 |
|
target_y |
m |
relative focus target position. |
0 |
|
target_z |
m |
relative focus target position. |
1 |
|
target_index |
|
Relative index of component to focus at, e.g. next is +1. |
1 |
|
focus_xw |
m |
horiz. dimension of a rectangular area. |
0.5 |
|
focus_yh |
m |
, vert. dimension of a rectangular area. |
0.5 |
|
focus_aw |
deg |
, horiz. angular dimension of a rectangular area. |
0 |
|
focus_ah |
deg |
, vert. angular dimension of a rectangular area. |
0 |
|
focus_r |
m |
case of circular focusing, focusing radius. |
0 |
|
pd_correlation_length |
|
(0,inf) defined as (dx/x), where x is de mean value and dx the standard devition of the variable |
0.0 |
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Links
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Component source code found in file SasView_broad_peak.comp.
