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#!/usr/bin/env python3
from pywarpx import picmi
# Physical constants
c = picmi.constants.c
q_e = picmi.constants.q_e
# Number of time steps
max_steps = 10
# Number of cells
nr = 64
nz = 512
# Physical domain
rmin = 0
rmax = 30e-06
zmin = -56e-06
zmax = 12e-06
# Domain decomposition
max_grid_size = 64
blocking_factor = 32
# Create grid
grid = picmi.CylindricalGrid(
number_of_cells = [nr, nz],
n_azimuthal_modes = 2,
lower_bound = [rmin, zmin],
upper_bound = [rmax, zmax],
lower_boundary_conditions = ['none', 'dirichlet'],
upper_boundary_conditions = ['dirichlet', 'dirichlet'],
lower_boundary_conditions_particles = ['absorbing', 'absorbing'],
upper_boundary_conditions_particles = ['absorbing', 'absorbing'],
moving_window_velocity = [0., c],
warpx_max_grid_size = max_grid_size,
warpx_blocking_factor = blocking_factor)
# Particles: plasma electrons
plasma_density = 2e23
plasma_xmin = -20e-06
plasma_ymin = None
plasma_zmin = 10e-06
plasma_xmax = 20e-06
plasma_ymax = None
plasma_zmax = None
uniform_distribution = picmi.UniformDistribution(
density = plasma_density,
lower_bound = [plasma_xmin, plasma_ymin, plasma_zmin],
upper_bound = [plasma_xmax, plasma_ymax, plasma_zmax],
fill_in = True)
electrons = picmi.Species(
particle_type = 'electron',
name = 'electrons',
initial_distribution = uniform_distribution)
# Particles: beam electrons
q_tot = 1e-12
x_m = 0.
y_m = 0.
z_m = -28e-06
x_rms = 0.5e-06
y_rms = 0.5e-06
z_rms = 0.5e-06
ux_m = 0.
uy_m = 0.
uz_m = 500.
ux_th = 2.
uy_th = 2.
uz_th = 50.
gaussian_bunch_distribution = picmi.GaussianBunchDistribution(
n_physical_particles = q_tot / q_e,
rms_bunch_size = [x_rms, y_rms, z_rms],
rms_velocity = [c*ux_th, c*uy_th, c*uz_th],
centroid_position = [x_m, y_m, z_m],
centroid_velocity = [c*ux_m, c*uy_m, c*uz_m])
beam = picmi.Species(
particle_type = 'electron',
name = 'beam',
initial_distribution = gaussian_bunch_distribution)
# Laser
e_max = 16e12
position_z = 9e-06
profile_t_peak = 30.e-15
profile_focal_distance = 100e-06
laser = picmi.GaussianLaser(
wavelength = 0.8e-06,
waist = 5e-06,
duration = 15e-15,
focal_position = [0, 0, profile_focal_distance + position_z],
centroid_position = [0, 0, position_z - c*profile_t_peak],
propagation_direction = [0, 0, 1],
polarization_direction = [0, 1, 0],
E0 = e_max,
fill_in = False)
laser_antenna = picmi.LaserAntenna(
position = [0., 0., position_z],
normal_vector = [0, 0, 1])
# Electromagnetic solver
solver = picmi.ElectromagneticSolver(
grid = grid,
method = 'Yee',
cfl = 1.,
divE_cleaning = 0)
# Diagnostics
diag_field_list = ['B', 'E', 'J', 'rho']
field_diag = picmi.FieldDiagnostic(
name = 'diag1',
grid = grid,
period = 10,
data_list = diag_field_list,
warpx_dump_rz_modes = 1,
write_dir = '.',
warpx_file_prefix = 'Python_LaserAccelerationRZ_plt')
diag_particle_list = ['weighting', 'momentum']
particle_diag = picmi.ParticleDiagnostic(
name = 'diag1',
period = 10,
species = [electrons, beam],
data_list = diag_particle_list,
write_dir = '.',
warpx_file_prefix = 'Python_LaserAccelerationRZ_plt')
# Set up simulation
sim = picmi.Simulation(
solver = solver,
max_steps = max_steps,
verbose = 1,
particle_shape = 'cubic',
warpx_use_filter = 1)
# Add plasma electrons
sim.add_species(
electrons,
layout = picmi.GriddedLayout(grid = grid, n_macroparticle_per_cell = [1, 4, 1]))
# Add beam electrons
sim.add_species(
beam,
layout = picmi.PseudoRandomLayout(grid = grid, n_macroparticles = 100))
# Add laser
sim.add_laser(
laser,
injection_method = laser_antenna)
# Add diagnostics
sim.add_diagnostic(field_diag)
sim.add_diagnostic(particle_diag)
# Write input file that can be used to run with the compiled version
sim.write_input_file(file_name = 'inputs_rz_picmi')
# Initialize inputs and WarpX instance
sim.initialize_inputs()
sim.initialize_warpx()
# Advance simulation until last time step
sim.step(max_steps)
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