CoreShellNanoparticles2: alternative implementation using ParticleComposition

Examples/scatter2d/CoreShellNanoparticles2.py

+#!/usr/bin/env python3
+"""
+Core shell nanoparticles.
+Alternative implementation using particle composition
+"""
+import bornagain as ba
+from bornagain import ba_plot as bp, deg, nm, std_samples
+
+
+def get_sample():
+    """
+    Returns a sample with box-shaped core-shell particles.
+    """
+
+    # Define materials
+    material_Diff = ba.RefractiveMaterial("Core", -4e-5, 0)
+    material_Shell = ba.RefractiveMaterial("Shell", 1e-4, 2e-8)
+
+    # Define form factors
+    ff_1 = ba.Box(12*nm, 12*nm, 7*nm)
+    ff_2 = ba.Box(16*nm, 16*nm, 8*nm)
+
+    # Define particles
+    core = ba.Particle(material_Diff, ff_1)
+    shell = ba.Particle(material_Shell, ff_2)
+    particle = ba.ParticleComposition()
+    particle.addParticle(shell)
+    particle.addParticle(core, ba.R3(0,0,0.5*nm))
+
+    return std_samples.sas_sample_with_particle(particle)
+
+
+def get_simulation(sample):
+    beam = ba.Beam(1, 0.1*nm, ba.Direction(0.2*deg, 0))
+    detector = ba.SphericalDetector(bp.simargs['n'], 2*deg, 0, 1*deg)
+    simulation = ba.ScatteringSimulation(beam, sample, detector)
+    return simulation
+
+
+if __name__ == '__main__':
+    bp.parse_args(sim_n=200)
+    sample = get_sample()
+    simulation = get_simulation(sample)
+    result = simulation.simulate()
+    bp.plot_simulation_result(result)

Tests/Examples/CMakeLists.txt

@@ -138,6 +138,7 @@ test_example(scatter2d/BoxesWithSpecularPeak 2e-10)
 test_example(scatter2d/BuriedParticles 2e-10)
 test_example(scatter2d/ConstantBackground 2e-10)
 test_example(scatter2d/CoreShellNanoparticles 2e-10)
+test_equality(scatter2d/CoreShellNanoparticles2 scatter2d/CoreShellNanoparticles 2e-10)
 test_example(scatter2d/CorrelatedRoughness 2e-10)
 test_example(scatter2d/CosineRipplesAtRectLattice 2e-10)
 test_example(scatter2d/CustomFormFactor 2e-10)