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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Sample/StandardSample/SlicedCylindersBuilder.cpp
//! @brief Implements classes for testing slicing machinery.
//!
//! @homepage http://www.bornagainproject.org
//! @license GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
// ************************************************************************************************
#include "Sample/StandardSample/SlicedCylindersBuilder.h"
#include "Base/Const/Units.h"
#include "Sample/Aggregate/ParticleLayout.h"
#include "Sample/HardParticle/Cylinder.h"
#include "Sample/Material/MaterialFactoryFuncs.h"
#include "Sample/Multilayer/Layer.h"
#include "Sample/Multilayer/Sample.h"
#include "Sample/Particle/Particle.h"
#include <numbers>
using std::numbers::pi;
namespace {
const double height(5);
const double radius(5);
const double wavelength(0.154); // nm
const int n_slices(3);
//! Returns SLD input (in inverse square Angstroms) for MaterialBySLD from _delta_ and _beta_,
//! i.e. the input for RefractiveMaterial.
complex_t getSLDFromN(double _wavelength, double delta, double beta)
{
complex_t result{2 * delta - delta * delta + beta * beta, 2 * beta - 2 * delta * beta};
return result * pi / (_wavelength * _wavelength) * (Units::angstrom * Units::angstrom);
}
complex_t averageSLD(complex_t sld_p, complex_t sld_l, double eff_vol)
{
return sld_l + eff_vol * (sld_p - sld_l);
}
} // namespace
Sample* ExemplarySamples::createSlicedCylinders()
{
Material vacuum_material = RefractiveMaterial("Vacuum", 0.0, 0.0);
Material substrate_material = RefractiveMaterial("Substrate", 6e-6, 2e-8);
Material particle_material = RefractiveMaterial("Particle", 6e-4, 2e-8);
Layer vacuum_layer(vacuum_material);
Layer substrate_layer(substrate_material);
Cylinder ff_cylinder(radius, height);
Particle particle(particle_material, ff_cylinder);
ParticleLayout particle_layout(particle);
vacuum_layer.addLayout(particle_layout);
vacuum_layer.setNumberOfSlices(n_slices);
auto* sample = new Sample;
sample->addLayer(vacuum_layer);
sample->addLayer(substrate_layer);
return sample;
}
Sample* ExemplarySamples::createSLDSlicedCylinders()
{
Material vacuum_material = MaterialBySLD("Vacuum", 0.0, 0.0);
complex_t sub_sld = getSLDFromN(wavelength, 6e-6, 2e-8);
Material substrate_material = MaterialBySLD("Substrate", sub_sld.real(), sub_sld.imag());
complex_t par_sld = getSLDFromN(wavelength, 6e-4, 2e-8);
Material particle_material = MaterialBySLD("Particle", par_sld.real(), par_sld.imag());
Layer vacuum_layer(vacuum_material);
Layer substrate_layer(substrate_material);
Cylinder ff_cylinder(radius, height);
Particle particle(particle_material, ff_cylinder);
ParticleLayout particle_layout(particle);
vacuum_layer.addLayout(particle_layout);
vacuum_layer.setNumberOfSlices(n_slices);
auto* sample = new Sample;
sample->addLayer(vacuum_layer);
sample->addLayer(substrate_layer);
return sample;
}
Sample* ExemplarySamples::createAveragedSlicedCylinders()
{
const auto par_surf_density = ParticleLayout().totalParticleSurfaceDensity();
complex_t vacuum_sld{0.0, 0.0};
Material vacuum_material = MaterialBySLD("Vacuum", vacuum_sld.real(), vacuum_sld.imag());
complex_t sub_sld = getSLDFromN(wavelength, 6e-6, 2e-8);
Material substrate_material = MaterialBySLD("Substrate", sub_sld.real(), sub_sld.imag());
double eff_vol = par_surf_density * pi * radius * radius;
complex_t par_sld = getSLDFromN(wavelength, 6e-4, 2e-8);
complex_t avr_sld = averageSLD(par_sld, vacuum_sld, eff_vol);
Material avr_material = MaterialBySLD("Avr", avr_sld.real(), avr_sld.imag());
Layer vacuum_layer(vacuum_material);
Layer avr_layer(avr_material, height / n_slices);
Layer substrate_layer(substrate_material);
auto* sample = new Sample;
sample->addLayer(vacuum_layer);
for (size_t i = 0; i < n_slices; ++i)
sample->addLayer(avr_layer);
sample->addLayer(substrate_layer);
return sample;
}
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