Simulation parameters

Simulation parameters class(pyrost.simulation.MSParams) for the multislice beam propagation stores all the experimental parameters and provides additional methods necessary to perform the propagation.

List of simulation parameters:

• Experimental geometry parameters:

  • x_min, x_max : Wavefront span along the x-axis [um].

  • x_step : Beam sampling interval along the x-axis [um].

  • z_step : Distance between the slices [um].

  • wl : Beam’s wavelength [um].

The ms_sim library can generate the transmission profile of the Multilayer Laue (MLL) lens. The required parameters to yield a transmission profile are as follows:

• MLL materials:

  • material1 : the first material in the MLL’s bilayers. * formula : Chemical formula of the material. * density : Atomic density of the material [g / cm^3].

  • material2 : the second material in the MLL’s bilayers. * formula : Chemical formula of the material. * density : Atomic density of the material [g / cm^3].

• MLL parameters:

  • n_min, n_max : zone number of the first and the last layer.

  • focus : MLL’s focal distance [um].

  • mll_sigma : Bilayer’s interdiffusion length [um].

  • mll_depth : MLL’s thickness [um].

  • mll_wl : Wavelength of the MLL [um].

Note

You can save parameters to an INI file with pyrost.multislice.MSParams.to_ini() and import parameters from an INI file with pyrost.multislice.MSParams.import_ini().

The default parameters are accessed with pyrost.multislice.MSParams.import_default(). The parameters are given by:

[multislice]
x_max = 30.0
x_min = 0.0
x_step = 1e-4
z_step = 5e-3
wl = 7.293187822128047e-5

[material1]
formula = W
density = 18.0

[material2]
formula = SiC
density = 2.8

[mll]
n_min = 100
n_max = 8000
focus = 1500.0
mll_sigma = 1e-4
mll_depth = 5.0
mll_wl = 7.293187822128047e-5

Examples

pyrost.multislice.MSParams.import_default() generates the multislice experimental parameters, which could be later parsed to pyrost.multislice.MSPropagator in order to perform the simulation.

>>> import pyrost.multislice as ms_sim
>>> ms_params = ms_sim.MSParams.import_default()
>>> print(ms_params)
{'multislice': {'x_max': 30.0, 'x_min': 0.0, 'x_step': 0.0001, '...': '...'},
 'material1': {'formula': 'W', 'density': 18.0}, 'material2': {'formula': 'SiC',
 'density': 2.8}, 'mll': {'focus': 1500.0, 'n_max': 8000, 'n_min': 100, '...': '...'}}

Contents

• Material
• MSParams