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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Sim/Simulation/DepthprobeSimulation.cpp
//! @brief Implements class DepthprobeSimulation.
//!
//! @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 "Sim/Simulation/DepthprobeSimulation.h"
#include "Base/Axis/Frame.h"
#include "Base/Axis/Scale.h"
#include "Base/Progress/ProgressHandler.h"
#include "Base/Util/Assert.h"
#include "Base/Vector/GisasDirection.h"
#include "Device/Beam/IFootprint.h"
#include "Device/Data/Datafield.h"
#include "Resample/Element/IElement.h"
#include "Resample/Element/ScanElement.h"
#include "Resample/Flux/ScalarFlux.h"
#include "Resample/Processed/ReSample.h"
#include "Sim/Scan/AlphaScan.h"
#include <numbers>
#include <valarray>
using std::numbers::pi;
const int ZDirection_None = 0;
const int ZDirection_Reflected = 1;
const int ZDirection_Transmitted = 2;
const int WaveProperty_Intensity = 0;
const int WaveProperty_Modulus = 4;
const int WaveProperty_Phase = 8;
DepthprobeSimulation::DepthprobeSimulation(const BeamScan& scan, const Sample& sample,
const Scale& zaxis, int flags)
: ISimulation(sample)
, m_scan(scan.clone())
, m_z_axis(zaxis.clone())
, m_flags(flags)
{
}
DepthprobeSimulation::~DepthprobeSimulation() = default;
std::vector<const INode*> DepthprobeSimulation::nodeChildren() const
{
std::vector<const INode*> result = ISimulation::nodeChildren();
result.push_back(m_scan.get());
return result;
}
//... Overridden executors:
void DepthprobeSimulation::initScanElementVector()
{
m_eles = m_scan->generateElements();
}
void DepthprobeSimulation::runComputation(const ReSample& re_sample, size_t i, double weight)
{
const size_t Nz = m_z_axis->size();
ASSERT(m_cache.size() / Nz == m_eles.size());
std::valarray<double> z_intensities; //!< simulated intensity for given z positions
z_intensities.resize(Nz, 0.0);
ScanElement& scan_ele = *(m_eles.begin() + static_cast<long>(i));
const R3 ki = scan_ele.k();
if (scan_ele.isCalculated() && ki.z() < 0) {
const size_t n_layers = re_sample.numberOfSlices();
size_t start_z_ind = Nz;
const R3 ki = scan_ele.k();
const Fluxes fluxes = re_sample.fluxesIn(ki);
double z_layer_bottom(0.0);
double z_layer_top(0.0);
for (size_t i_layer = 0; i_layer < n_layers && start_z_ind != 0; ++i_layer) {
z_layer_bottom = re_sample.avgeSlice(i_layer).low();
z_layer_top = i_layer ? re_sample.avgeSlice(i_layer).hig() : z_layer_bottom;
// get R & T coefficients for current layer
const auto* flux = dynamic_cast<const ScalarFlux*>(fluxes[i_layer]);
ASSERT(flux);
const complex_t R = flux->getScalarR();
const complex_t T = flux->getScalarT();
const complex_t kz_out = flux->getScalarKz();
const complex_t kz_in = -kz_out;
// Compute intensity for z's of the layer
size_t ip1_z = start_z_ind;
for (; ip1_z > 0; --ip1_z) {
const size_t i_z = ip1_z - 1;
if (i_layer + 1 != n_layers && m_z_axis->binCenter(i_z) <= z_layer_bottom)
break;
const double z = m_z_axis->binCenter(i_z) - z_layer_top;
complex_t psi;
if ((m_flags & 3) == ZDirection_None)
psi = R * exp_I(kz_out * z) + T * exp_I(kz_in * z);
else if (m_flags & ZDirection_Reflected)
psi = R * exp_I(kz_out * z);
else if (m_flags & ZDirection_Transmitted)
psi = T * exp_I(kz_in * z);
else
throw std::runtime_error("Invalid combination of ZDirection flags");
if ((m_flags & 12) == WaveProperty_Intensity)
z_intensities[i_z] = std::norm(psi);
else if (m_flags & WaveProperty_Modulus)
z_intensities[i_z] = std::abs(psi);
else if (m_flags & WaveProperty_Phase)
z_intensities[i_z] = std::arg(psi);
else
throw std::runtime_error("Invalid combination of WaveProperty flags");
}
start_z_ind = ip1_z;
}
}
for (double& v : z_intensities)
v *= scan_ele.beamIntensity();
for (size_t j = 0; j < Nz; ++j)
m_cache[j * m_scan->nElements() + i] += z_intensities[j] * weight * scan_ele.weight();
progress().incrementDone(1);
}
//... Overridden getters:
size_t DepthprobeSimulation::nElements() const
{
return m_scan->nElements();
}
size_t DepthprobeSimulation::nOutChannels() const
{
return nElements() * m_z_axis->size();
}
Datafield DepthprobeSimulation::packResult() const
{
const size_t Nz = m_z_axis->size();
const size_t Ns = m_scan->nScan();
const size_t Nslong = m_scan->nElements();
std::vector<double> out(Ns * Nz, 0.0);
for (size_t j = 0; j < Nz; ++j)
for (size_t i = 0; i < Nslong; ++i) {
const ScanElement& ele = m_eles.at(i);
const size_t i_real = ele.i_out();
out[j * Ns + i_real] += m_cache[j * Nslong + i];
}
if (background())
throw std::runtime_error("nonzero background is not supported by DepthprobeSimulation");
std::vector<const Scale*> axes{m_scan->coordinateAxis()->clone(), m_z_axis->clone()};
return {axes, out};
}
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