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Beam divergence

Result

Beam divergence result

Sample

Beam divergence sample

Python script

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#!/usr/bin/env python3
# /// script
# requires-python = ">=3.10"
# dependencies = ["bornagain>=25,<26"]
# ///
"""
Cylinder form factor in DWBA with beam divergence.
For GISAS simulations only.
"""
import bornagain as ba
ba.require_versions("bornagain>=25,<26")
from bornagain import deg, nm


def get_sample():
    """
    A dilute random assembly of cylinders on a substrate.
    """
    substrate_color = (0.28, 0.57, 0.82)
    substrate_mat = ba.RefractiveMaterial("Substrate", substrate_color, 6e-6, 2e-8)
    particle_color = (0.86, 0.24, 0.18)
    particle_mat = ba.RefractiveMaterial("Particle", particle_color, 6e-4, 2e-8)
    particle = ba.Particle(particle_mat, ba.Cylinder(5*nm, 5*nm))

    particle_layer = ba.Layer(ba.Vacuum())
    particle_layer.deposit2D(ba.Dilute2D(0.001, particle))
    substrate_layer = ba.Layer(substrate_mat)

    sample = ba.Sample()
    sample.addLayer(particle_layer)
    sample.addLayer(substrate_layer)
    return sample


def get_simulation(sample):
    beam = ba.Beam(1e9, 0.1*nm, 0.2*deg)
    n = 100
    detector = ba.SphericalDetector(n, 0., 2*deg, n, 0., 2*deg)
    simulation = ba.ScatteringSimulation(beam, sample, detector)
    
    distr_1 = ba.DistributionLogNormal(0.1*nm, 0.1, 5, 2)
    simulation.addParameterDistribution(
        ba.ParameterDistribution.BeamWavelength, distr_1)
    
    distr_2 = ba.DistributionGaussian(0.2*deg, 0.1*deg, 5, 2)
    simulation.addParameterDistribution(
        ba.ParameterDistribution.BeamGrazingAngle, distr_2)
    
    distr_3 = ba.DistributionGaussian(0, 0.1*deg, 5, 2)
    simulation.addParameterDistribution(
        ba.ParameterDistribution.BeamAzimuthalAngle, distr_3)
    
    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()
auto/Examples/gisas/setup/BeamDivergence.py