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"""
Cylindrical particle made from two materials.
Particle crosses air/substrate interface.
"""
import bornagain as ba
from bornagain import deg, angstrom, nm
def get_composition(top_material, bottom_material,
top_height=4.0, bottom_height=10.0):
"""
Returns cylindrical particle made of two different materials.
"""
cylinder_radius = 10*nm
topPart = ba.Particle(top_material,
ba.FormFactorCylinder(cylinder_radius, top_height))
bottomPart = ba.Particle(bottom_material,
ba.FormFactorCylinder(cylinder_radius, bottom_height))
result = ba.ParticleComposition()
result.addParticle(topPart, ba.kvector_t(0.0, 0.0, bottom_height))
result.addParticle(bottomPart)
return result
def get_sample():
"""
Returns a multi layer with substrate/air layers.
Air layer contains cylindrical particles made of two materials.
Particle shifted down to cross interface.
"""
# defining materials
m_air = ba.HomogeneousMaterial("Air", 0.0, 0.0)
m_substrate = ba.HomogeneousMaterial("Substrate", 3.212e-6, 3.244e-8)
m_top_part = ba.HomogeneousMaterial("Ag", 1.245e-5, 5.419e-7)
m_bottom_part = ba.HomogeneousMaterial("Teflon", 2.900e-6, 6.019e-9)
# collection of particles
composition = get_composition(m_top_part, m_bottom_part)
shift = 10.0*nm
composition.setPosition(0, 0, -shift) # will be shifted below interface
particle_layout = ba.ParticleLayout()
particle_layout.addParticle(composition)
particle_layout.setTotalParticleSurfaceDensity(1)
# air layer with particles and substrate form multi layer
air_layer = ba.Layer(m_air)
air_layer.addLayout(particle_layout)
substrate_layer = ba.Layer(m_substrate)
multi_layer = ba.MultiLayer()
multi_layer.addLayer(air_layer)
multi_layer.addLayer(substrate_layer)
print(multi_layer.treeToString())
return multi_layer
def get_simulation():
"""
Returns a GISAXS simulation with beam and detector defined.
"""
simulation = ba.GISASSimulation()
simulation.setDetectorParameters(100, -1.0*deg, 1.0*deg,
100, 0.0*deg, 2.0*deg)
simulation.setBeamParameters(1.0*angstrom, 0.2*deg, 0.0*deg)
simulation.setBeamIntensity(1.0e+08)
return simulation
def run_simulation():
"""
Runs simulation and returns resulting intensity map.
"""
simulation = get_simulation()
simulation.setSample(get_sample())
simulation.runSimulation()
return simulation.result()
if __name__ == '__main__':
result = run_simulation()
ba.plot_simulation_result(result, cmap='jet', aspect='auto')
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