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#!/usr/bin/env python3
# /// script
# requires-python = ">=3.10"
# dependencies = ["bornagain>=25,<26"]
# ///
"""
Cylinder form factor in Born approximation
"""
import bornagain as ba
ba.require_versions("bornagain>=25,<26")
from bornagain import deg, nm, nm2
def get_sample():
"""
A sample with cylinders in a homogeneous environment ("Vacuum"),
implying a simulation in plain Born approximation.
"""
# Materials
particle_color = (0.86, 0.24, 0.18)
particle_mat = ba.RefractiveMaterial("Particle", particle_color, 0.0006, 2e-08)
vacuum = ba.Vacuum()
# Particle
ff = ba.Cylinder(5*nm, 5*nm)
particle = ba.Particle(particle_mat, ff)
# Layers: two vacuum layers, particles deposited at their interface
layer_top = ba.Layer(vacuum)
layer_bottom = ba.Layer(vacuum)
layer_top.deposit2D(ba.Dilute2D(0.01/nm2, particle))
# Sample
sample = ba.Sample()
sample.addLayer(layer_top)
sample.addLayer(layer_bottom)
return sample
def get_simulation(sample):
beam = ba.Beam(1e9, 0.1*nm, 0.2*deg)
n = 200
detector = ba.SphericalDetector(n, -2*deg, 2*deg, n, 0, 3*deg)
simulation = ba.ScatteringSimulation(beam, sample, detector)
# Plain Born approximation in a homogeneous vacuum environment,
# not an averaged decorated layer.
simulation.options().setUseAvgMaterials(False)
return simulation
if __name__ == '__main__':
sample = get_sample()
ba.showSample3D(sample, sample_size=120*nm, seed=0)
simulation = get_simulation(sample)
result = simulation.simulate()
ba.plot_datafield(result, unit_aspect=1)
ba.plt.show()
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