## Time-of-flight reflectometry

This short tutorial quickly illustrates the setup of a time-of-flight (TOF) reflectometry simulated experiment.

Setting up a TOF simulation boils down to specifying the range of values spanned by the $q_z$ vector, rather than the range spanned by the angle $\theta$ of the beam:

    qzs = np.linspace(0.01, 1.0, scan_size)  # qz-values
scan = ba.QSpecScan(qzs)
simulation = ba.SpecularSimulation()
simulation.setScan(scan)

  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  #!/usr/bin/env python3 """ An example of defining reflectometry instrument for time of flight experiment. In this example we will use purely qz-defined beam, without explicitly specifying incident angle or a wavelength. Note that these approaches work with SLD-based materials only. """ import numpy as np import bornagain as ba from bornagain import ba_plot as bp, std_samples def get_sample(): return std_samples.alternating_layers() def get_simulation(sample): """ Defines and returns specular simulation with a qz-defined beam """ n = bp.simargs['n'] qzs = np.linspace(0.01, 1, n) # qz-values scan = ba.QzScan(qzs) return ba.SpecularSimulation(scan, sample) if __name__ == '__main__': bp.parse_args(sim_n=500) sample = get_sample() simulation = get_simulation(sample) result = simulation.simulate() bp.plot_simulation_result(result) 
Examples/specular/TimeOfFlightReflectometry.py