## Hemispheres in Averaged Layer

Supposing a Simulation has been defined in which some layers contain embedded particles of different materials; to regard those layers as composed by a single material, the setUseAvgMaterials method is used:

simulation.getOptions().setUseAvgMaterials(True)


The script below shows how to average materials when simulating scattering from a square lattice of hemispheres on a substrate.

  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66  #!/usr/bin/env python3 """ Square lattice of half spheres on substrate with usage of average material and slicing """ import bornagain as ba from bornagain import deg, nm def get_sample(): """ Returns a sample with cylinders on a substrate. """ # Define materials material_Particle = ba.HomogeneousMaterial("Particle", 3e-05, 2e-08) material_Substrate = ba.HomogeneousMaterial("Substrate", 6e-06, 2e-08) material_Vacuum = ba.HomogeneousMaterial("Vacuum", 0, 0) # Define form factors ff = ba.FormFactorTruncatedSphere(5*nm, 5*nm, 0) # Define particles particle = ba.Particle(material_Particle, ff) # Define 2D lattices lattice = ba.BasicLattice2D(10*nm, 10*nm, 90*deg, 0) # Define interference functions iff = ba.InterferenceFunction2DLattice(lattice) iff_pdf = ba.FTDecayFunction2DCauchy(100*nm, 100*nm, 0) iff.setDecayFunction(iff_pdf) # Define particle layouts layout = ba.ParticleLayout() layout.addParticle(particle) layout.setInterferenceFunction(iff) layout.setTotalParticleSurfaceDensity(0.01) # Define layers layer_1 = ba.Layer(material_Vacuum) layer_1.setNumberOfSlices(10) layer_1.addLayout(layout) layer_2 = ba.Layer(material_Substrate) # Define sample sample = ba.MultiLayer() sample.addLayer(layer_1) sample.addLayer(layer_2) return sample def get_simulation(sample): beam = ba.Beam(1, 0.1*nm, ba.Direction(0.2*deg, 0)) detector = ba.SphericalDetector(100, -2*deg, 2*deg, 100, 0, 2*deg) simulation = ba.GISASSimulation(beam, sample, detector) simulation.getOptions().setUseAvgMaterials(True) return simulation if __name__ == '__main__': import ba_plot sample = get_sample() simulation = get_simulation(sample) ba_plot.run_and_plot(simulation) 
HalfSpheresInAverageTopLayer.py