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14.93 The SANS_Liposomes_Abs McStas Component
Solid dilute monodisperse spheres sample with transmitted beam for Small Angle Neutron Scattering.
Identification
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Author: Wim Bouwman, Delft University of Technology
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Origin: TUDelft
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Date: Aug 2012
Description
Sample for Small Angle Neutron Scattering. Modified from the Any Sample model. Normalization of scattering is done in INITIALIZE. Some elements of Sans_spheres have been re-used
Some remarks: Scattering function should be a defined the same way in INITIALIZE and TRACE sections There exist maybe better library functions for the integral.
Transmitted paths set to 50% of all paths to be optimised for SESANS. In this simulation method paths are well distributed among transmission and scattering (equally in Q-space).
Sample components leave the units of flux for the probability of the individual paths. That is more consitent than the Sans_spheres routine. Furthermore one can simulate the transmitted beam. This allows to determine the needed size of the beam stop. Absorption is included to these sample-components.
Example: SANS_Spheres_Abs(R=100, Phi=1e-3, Delta_rho=0.6, sigma_a = 50, qmax=0.03, xwidth=0.01, yheight=0.01, zthick=0.001)
Input parameters
Parameters in boldface are required; the others are optional.
|
Name |
Unit |
Description |
Default |
|
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|
R |
Å |
Radius of scattering hard spheres |
100 |
|
dR |
Å |
Gaussian standard deviation of the radius R (polydispersity) |
0.0 |
|
Phi |
1 |
Particle volume fraction |
1e-3 |
|
Delta_rho |
fm/Å\(^{3}\) |
Excess scattering length density |
0.6 |
|
sigma_a |
m\(^{-1}\) |
Absorption cross section density at 2200 m/s |
0.50 |
|
qmax |
Å\(^{-1}\) |
Maximum scattering vector (typically 10/R to observe the 3rd ring) |
0.03 |
|
xwidth |
m |
horiz. dimension of sample, as a width |
0.01 |
|
yheight |
m |
vert.. dimension of sample, as a height |
0.01 |
|
zthick |
m |
thickness of sample |
0.001 |
|
dbilayer |
Å |
Thickness of the lipid bilayer (shell) |
35 |
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Links
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Component source code found in file SANS_Liposomes_Abs.comp.
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Sans_spheres component
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SANS_AnySamp component
