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
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
# Maximum number of time steps
max_step = 80
# number of grid points
amr.n_cell = 128
# Maximum allowable size of each subdomain in the problem domain;
# this is used to decompose the domain for parallel calculations.
amr.max_grid_size = 64
# Maximum level in hierarchy (for now must be 0, i.e., one level in total)
amr.max_level = 0
# Geometry
geometry.coord_sys = 0 # 0: Cartesian
geometry.prob_lo = -20.e-6 # physical domain
geometry.prob_hi = 20.e-6
# Boundary condition
boundary.field_lo = periodic
boundary.field_hi = periodic
warpx.serialize_ics = 1
# Verbosity
warpx.verbose = 1
# Algorithms
algo.field_gathering = energy-conserving
warpx.use_filter = 0
# Order of particle shape factors
algo.particle_shape = 1
# CFL
warpx.cfl = 0.8
# Parameters for the plasma wave
my_constants.epsilon = 0.01
my_constants.n0 = 2.e24 # electron and positron densities, #/m^3
my_constants.wp = sqrt(2.*n0*q_e**2/(epsilon0*m_e)) # plasma frequency
my_constants.kp = wp/clight # plasma wavenumber
my_constants.k = 2.*pi/20.e-6 # perturbation wavenumber
# Note: kp is calculated in SI for a density of 4e24 (i.e. 2e24 electrons + 2e24 positrons)
# k is calculated so as to have 2 periods within the 40e-6 wide box.
# Particles
particles.species_names = electrons positrons
electrons.charge = -q_e
electrons.mass = m_e
electrons.injection_style = "NUniformPerCell"
electrons.num_particles_per_cell_each_dim = 2
electrons.zmin = -20.e-6
electrons.zmax = 20.e-6
electrons.profile = constant
electrons.density = n0 # number of electrons per m^3
electrons.momentum_distribution_type = parse_momentum_function
electrons.momentum_function_ux(x,y,z) = "epsilon * k/kp * sin(k*x) * cos(k*y) * cos(k*z)"
electrons.momentum_function_uy(x,y,z) = "epsilon * k/kp * cos(k*x) * sin(k*y) * cos(k*z)"
electrons.momentum_function_uz(x,y,z) = "epsilon * k/kp * cos(k*x) * cos(k*y) * sin(k*z)"
positrons.charge = q_e
positrons.mass = m_e
positrons.injection_style = "NUniformPerCell"
positrons.num_particles_per_cell_each_dim = 2
positrons.zmin = -20.e-6
positrons.zmax = 20.e-6
positrons.profile = constant
positrons.density = n0 # number of positrons per m^3
positrons.momentum_distribution_type = parse_momentum_function
positrons.momentum_function_ux(x,y,z) = "-epsilon * k/kp * sin(k*x) * cos(k*y) * cos(k*z)"
positrons.momentum_function_uy(x,y,z) = "-epsilon * k/kp * cos(k*x) * sin(k*y) * cos(k*z)"
positrons.momentum_function_uz(x,y,z) = "-epsilon * k/kp * cos(k*x) * cos(k*y) * sin(k*z)"
# Diagnostics
diagnostics.diags_names = diag1 openpmd
diag1.intervals = 40
diag1.diag_type = Full
openpmd.intervals = 40
openpmd.diag_type = Full
openpmd.format = openpmd
|
