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14.95 The Sans_liposomes_new McStas Component
Release: McStas 1.12
SANS sample, spherical shells in thin solution with gaussian size distribution
Identification
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Author: P. Willendrup, K. Lefmann, L. Arleth, L. Udby
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Origin: Risoe
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Date: 19.12.2003
Description
Sample for Small Angle Neutron Scattering - spherical shells in thin solution with gaussian size distribution The shape of the sample may be a cylinder of given radius or a box with dimensions xwidth, yheight, zthick. qmax defines a cutoff in q.
Example: Sans_spheres(R = 100, dR = 5, dbilayer=35, Phi = 1e-3, Delta_rho = 0.6, sigma_a = 50, qmax = 0.3 ,xwidth=0.01, yheight=0.01, zthick=0.005)
%BUGS This component does NOT simulate absolute intensities. This latter depends on the detector parameters.
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 |
|
dist |
m |
Distance from sample to detector |
6 |
|
Rdet |
m |
Detector (disk-shaped) radius |
0.5 |
|
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 |
0.005 |
|
qmax |
Å\(^{-1}\) |
Maximum momentum transfer |
0 |
|
dbilayer |
Å |
Thickness of shell |
35 |
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Links
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Component source code found in file Sans_liposomes_new.comp.
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The test/example instrument SANS.instr.
