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The SasView_ass_urface_ractal McXtrace Component

11.60  The SasView_mass_surface_fractal McXtrace Component

SasView mass_surface_fractal model component as sample description.

Identification

  • Author: Jose Robledo

  • Origin: FZJ / DTU / ESS DMSC

  • Date:

Description

SasView_mass_surface_fractal component, generated from mass_surface_fractal.c in sasmodels.

Example: SasView_mass_surface_fractal(fractal_dim_mass, fractal_dim_surf, rg_cluster, rg_primary, 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_rg_cluster=0.0, pd_rg_primary=0.0)

Input parameters

Parameters in boldface are required; the others are optional.

Name

Unit

Description

Default

fractal_dim_mass

([0.0, 6.0]) Mass fractal dimension.

1.8

fractal_dim_surf

([0.0, 6.0]) Surface fractal dimension.

2.3

rg_cluster

Å

([0.0, inf]) Cluster radius of gyration.

4000.0

rg_primary

Å

([0.0, inf]) Primary particle radius of gyration. Optional parameters:

86.7

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_rg_cluster

(0,inf) defined as (dx/x), where x is de mean value and dx the standard devition of the variable.

0.0

pd_rg_primary

(0,inf) defined as (dx/x), where x is de mean value and dx the standard devition of the variable

0.0

Links

  • Component source code found in file SasView_mass_surface_fractal.comp.


Last Modified: Monday, 02-Nov-2026 22:21:07 CET
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