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#!/usr/bin/env python3
# /// script
# requires-python = ">=3.10"
# dependencies = ["bornagain>=25,<26"]
# ///
"""
Cylinder form factor in DWBA with background/noise
"""
import random
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, background):
beam = ba.Beam(1e8, 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)
simulation.setBackground(background)
return simulation
def simulate(background, title):
sample = get_sample()
simulation = get_simulation(sample, background)
result = simulation.simulate()
result.setTitle(title)
return result
if __name__ == '__main__':
# New seed each run; constant seed reproduces the same noise realization.
poisson_seed = random.randrange(2**32)
results = [
simulate(ba.ConstantBackground(1e0), "Constant background"),
simulate(ba.PoissonBackground(seed=poisson_seed), "Poisson noise"),
]
ba.showSample3D(get_sample(), sample_size=120*nm, seed=0)
ba.plot2d_to_row(results, log_range=5, unit_aspect=1)
ba.plt.show()
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BornAgain
≻ git-develop
≻ Documentation ≻ Examples ≻ GISAS ≻ Simulation setup and instrument ≻ Background
