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McStas: SasView_two_lorentzian

[ Identification | Description | Input parameters | Links ]

The SasView_two_lorentzian Component

SasView two_lorentzian model component as sample description.

Identification

  • Site:
  • Author: Jose Robledo
  • Origin: FZJ / DTU / ESS DMSC
  • Date:

Description

SasView_two_lorentzian component, generated from two_lorentzian.c in sasmodels.

Example:
SasView_two_lorentzian(lorentz_scale_1, lorentz_length_1, lorentz_exp_1, lorentz_scale_2, lorentz_length_2, lorentz_exp_2,
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_lorentz_length_1=0.0, pd_lorentz_length_2=0.0)

Input parameters

Parameters in boldface are required; the others are optional.
NameUnitDescriptionDefault
lorentz_scale_1([-inf, inf]) First power law scale factor.10.0
lorentz_length_1Ang([-inf, inf]) First Lorentzian screening length.100.0
lorentz_exp_1([-inf, inf]) First exponent of power law.3.0
lorentz_scale_2([-inf, inf]) Second scale factor for broad Lorentzian peak.1.0
lorentz_length_2Ang([-inf, inf]) Second Lorentzian screening length.10.0
lorentz_exp_2([-inf, inf]) Second exponent of power law.2.0
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
xwidthm([-inf, inf]) Horiz. dimension of sample, as a width.0.01
yheightm([-inf, inf]) vert . dimension of sample, as a height for cylinder/box0.01
zdepthm([-inf, inf]) depth of sample0.005
RmOuter radius of sample in (x,z) plane for cylinder/sphere.0
target_xmrelative focus target position.0
target_ymrelative focus target position.0
target_zmrelative focus target position.1
target_index Relative index of component to focus at, e.g. next is +1.1
focus_xwmhoriz. dimension of a rectangular area.0.5
focus_yhm, vert. dimension of a rectangular area.0.5
focus_awdeg, horiz. angular dimension of a rectangular area.0
focus_ahdeg, vert. angular dimension of a rectangular area.0
focus_rmcase of circular focusing, focusing radius.0
pd_lorentz_length_1(0,inf) defined as (dx/x), where x is de mean value and dx the standard devition of the variable.0.0
pd_lorentz_length_2(0,inf) defined as (dx/x), where x is de mean value and dx the standard devition of the variable0.0
AT ( , , ) RELATIVE
ROTATED ( , , ) RELATIVE

Links


[ Identification | Description | Input parameters | Links ]

Generated on 2023-09-19 20:01:36


Last Modified: Tuesday, 16-Apr-2024 20:05:21 CEST
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