def save_to_openpmd_file(beam_data,
folder_path,
file_name,
reposition=False,
avg_pos=[None, None, None],
avg_mom=[None, None, None],
n_part=None,
species_name='particle_beam'):
"""
Saves particle data to an HDF5 file following the openPMD standard.
Parameters
----------
beam_data : list
Contains the beam data as [x, y, z, px, py, pz, q], where the positions
have units of meters, momentun is in non-dimensional units (beta*gamma)
and q is in Coulomb.
folder_path : str
Path to the folder in which to save the data
file_name : str
Name of the file to save without extension
reposition : bool
Optional. Whether to reposition de particle distribution in space
and/or momentum centered in the coordinates specified in avg_pos and
avg_mom
avg_pos : list
Optional, only used it reposition=True. Contains the new average
positions of the beam after repositioning. Should be specified as
[x_avg, y_avg, z_avg] in meters. Setting a component as None prevents
repositioning in that coordinate.
avg_mom : list
Optional, only used it reposition=True. Contains the new
average momentum of the beam after repositioning. Should be specified
as [px_avg, py_avg, pz_avg] in non-dimmesional units (beta*gamma).
Setting a component as None prevents repositioning in that coordinate.
n_part : int
Optional. Number of particles to save. Must be lower than the original
number of particles. Particles to save are chosen randomly.
species_name : str
Optional. Name under which the particle species should be stored.
"""
# Perform repositioning of original distribution
if reposition:
reposition_bunch(beam_data, avg_pos + avg_mom)
# Create subset of n_part
if n_part is not None:
beam_data = get_particle_subset(beam_data,
n_part,
preserve_charge=True)
# Get beam data
x = np.ascontiguousarray(beam_data[0])
y = np.ascontiguousarray(beam_data[1])
z = np.ascontiguousarray(beam_data[2])
px = np.ascontiguousarray(beam_data[3])
py = np.ascontiguousarray(beam_data[4])
pz = np.ascontiguousarray(beam_data[5])
q = np.ascontiguousarray(beam_data[6])
# Save to file
file_path = path.join(folder_path, file_name)
if not file_path.endswith('.h5'):
file_path += '.h5'
opmd_series = Series(file_path, Access.create)
# Set basic attributes.
opmd_series.set_software('APtools', __version__)
opmd_series.set_particles_path('particles')
# Create iteration
it = opmd_series.iterations[0]
# Create particles species.
particles = it.particles[species_name]
# Create additional necessary arrays and constants.
w = np.abs(q) / ct.e
m = ct.m_e
q = -ct.e
px = px * m * ct.c
py = py * m * ct.c
pz = pz * m * ct.c
# Generate datasets.
d_x = Dataset(x.dtype, extent=x.shape)
d_y = Dataset(y.dtype, extent=y.shape)
d_z = Dataset(z.dtype, extent=z.shape)
d_px = Dataset(px.dtype, extent=px.shape)
d_py = Dataset(py.dtype, extent=py.shape)
d_pz = Dataset(pz.dtype, extent=pz.shape)
d_w = Dataset(w.dtype, extent=w.shape)
d_q = Dataset(np.dtype('float64'), extent=[1])
d_m = Dataset(np.dtype('float64'), extent=[1])
d_xoff = Dataset(np.dtype('float64'), extent=[1])
d_yoff = Dataset(np.dtype('float64'), extent=[1])
d_zoff = Dataset(np.dtype('float64'), extent=[1])
# Record data.
particles['position']['x'].reset_dataset(d_x)
particles['position']['y'].reset_dataset(d_y)
particles['position']['z'].reset_dataset(d_z)
particles['positionOffset']['x'].reset_dataset(d_xoff)
particles['positionOffset']['y'].reset_dataset(d_yoff)
particles['positionOffset']['z'].reset_dataset(d_zoff)
particles['momentum']['x'].reset_dataset(d_px)
particles['momentum']['y'].reset_dataset(d_py)
particles['momentum']['z'].reset_dataset(d_pz)
particles['weighting'][SCALAR].reset_dataset(d_w)
particles['charge'][SCALAR].reset_dataset(d_q)
particles['mass'][SCALAR].reset_dataset(d_m)
# Prepare for writting.
particles['position']['x'].store_chunk(x)
particles['position']['y'].store_chunk(y)
particles['position']['z'].store_chunk(z)
particles['positionOffset']['x'].make_constant(0.)
particles['positionOffset']['y'].make_constant(0.)
particles['positionOffset']['z'].make_constant(0.)
particles['momentum']['x'].store_chunk(px)
particles['momentum']['y'].store_chunk(py)
particles['momentum']['z'].store_chunk(pz)
particles['weighting'][SCALAR].store_chunk(w)
particles['charge'][SCALAR].make_constant(q)
particles['mass'][SCALAR].make_constant(m)
# Set units.
particles['position'].unit_dimension = {Unit_Dimension.L: 1}
particles['positionOffset'].unit_dimension = {Unit_Dimension.L: 1}
particles['momentum'].unit_dimension = {
Unit_Dimension.L: 1,
Unit_Dimension.M: 1,
Unit_Dimension.T: -1,
}
particles['charge'].unit_dimension = {
Unit_Dimension.T: 1,
Unit_Dimension.I: 1,
}
particles['mass'].unit_dimension = {Unit_Dimension.M: 1}
# Set weighting attributes.
particles['position'].set_attribute('macroWeighted', np.uint32(0))
particles['positionOffset'].set_attribute('macroWeighted', np.uint32(0))
particles['momentum'].set_attribute('macroWeighted', np.uint32(0))
particles['weighting'][SCALAR].set_attribute('macroWeighted', np.uint32(1))
particles['charge'][SCALAR].set_attribute('macroWeighted', np.uint32(0))
particles['mass'][SCALAR].set_attribute('macroWeighted', np.uint32(0))
particles['position'].set_attribute('weightingPower', 0.)
particles['positionOffset'].set_attribute('weightingPower', 0.)
particles['momentum'].set_attribute('weightingPower', 1.)
particles['weighting'][SCALAR].set_attribute('weightingPower', 1.)
particles['charge'][SCALAR].set_attribute('weightingPower', 1.)
particles['mass'][SCALAR].set_attribute('weightingPower', 1.)
# Flush data.
opmd_series.flush()
def save_for_csrtrack_fmt1(beam_data,
folder_path,
file_name,
reposition=False,
avg_pos=[None, None, None],
avg_mom=[None, None, None],
n_part=None):
"""Saves particle data for CSRtrack in fmt1 format.
Parameters
----------
beam_data : list
Contains the beam data as [x, y, z, px, py, pz, q], where the positions
have units of meters, momentun is in non-dimensional units (beta*gamma)
and q is in Coulomb.
folder_path : str
Path to the folder in which to save the data
file_name : str
Name of the file to save without extension
reposition : bool
Optional. Whether to reposition de particle distribution in space
and/or momentum centered in the coordinates specified in avg_pos and
avg_mom
avg_pos : list
Optional, only used it reposition=True. Contains the new average
positions of the beam after repositioning. Should be specified as
[x_avg, y_avg, z_avg] in meters. Setting a component as None prevents
repositioning in that coordinate.
avg_mom : list
Optional, only used it reposition=True. Contains the new
average momentum of the beam after repositioning. Should be specified
as [px_avg, py_avg, pz_avg] in non-dimmesional units (beta*gamma).
Setting a component as None prevents repositioning in that coordinate.
n_part : int
Optional. Number of particles to save. Must be lower than the original
number of particles. Particles to save are chosen randomly.
"""
# Perform repositioning of original distribution
if reposition:
reposition_bunch(beam_data, avg_pos + avg_mom)
# Create subset of n_part
if n_part is not None:
beam_data = get_particle_subset(beam_data,
n_part,
preserve_charge=True)
# Get beam data
x_orig = beam_data[0]
y_orig = beam_data[1]
xi_orig = beam_data[2]
px_orig = beam_data[3] * ct.m_e * ct.c**2 / ct.e
py_orig = beam_data[4] * ct.m_e * ct.c**2 / ct.e
pz_orig = beam_data[5] * ct.m_e * ct.c**2 / ct.e
q_orig = beam_data[6]
# Create arrays
x = np.zeros(q_orig.size + 2)
y = np.zeros(q_orig.size + 2)
xi = np.zeros(q_orig.size + 2)
px = np.zeros(q_orig.size + 2)
py = np.zeros(q_orig.size + 2)
pz = np.zeros(q_orig.size + 2)
q = np.zeros(q_orig.size + 2)
# Reference particle
x[1] = np.average(x_orig, weights=q_orig)
y[1] = np.average(y_orig, weights=q_orig)
xi[1] = np.average(xi_orig, weights=q_orig)
px[1] = np.average(px_orig, weights=q_orig)
py[1] = np.average(py_orig, weights=q_orig)
pz[1] = np.average(pz_orig, weights=q_orig)
q[1] = sum(q_orig) / len(q_orig)
# Relative coordinates
x[2::] = x_orig - x[1]
y[2::] = y_orig - y[1]
xi[2::] = xi_orig - xi[1]
px[2::] = px_orig - px[1]
py[2::] = py_orig - py[1]
pz[2::] = pz_orig - pz[1]
q[2::] = q_orig
# Save to file
data = np.column_stack((xi, x, y, pz, px, py, q))
file_name += '.fmt1'
np.savetxt(path.join(folder_path, file_name), data,
'%1.12e %1.12e %1.12e %1.12e %1.12e %1.12e %1.12e')
def save_for_fbpic(beam_data,
folder_path,
file_name,
reposition=False,
avg_pos=[None, None, None],
avg_mom=[None, None, None],
n_part=None):
"""Saves particle data in in a format that can be read by FBPIC.
Parameters
----------
beam_data : list
Contains the beam data as [x, y, z, px, py, pz, q], where the positions
have units of meters, momentun is in non-dimensional units (beta*gamma)
and q is in Coulomb.
folder_path : str
Path to the folder in which to save the data
file_name : str
Name of the file to save without extension
reposition : bool
Optional. Whether to reposition de particle distribution in space
and/or momentum centered in the coordinates specified in avg_pos and
avg_mom
avg_pos : list
Optional, only used it reposition=True. Contains the new average
positions of the beam after repositioning. Should be specified as
[x_avg, y_avg, z_avg] in meters. Setting a component as None prevents
repositioning in that coordinate.
avg_mom : list
Optional, only used it reposition=True. Contains the new
average momentum of the beam after repositioning. Should be specified
as [px_avg, py_avg, pz_avg] in non-dimmesional units (beta*gamma).
Setting a component as None prevents repositioning in that coordinate.
n_part : int
Optional. Number of particles to save. Must be lower than the original
number of particles. Particles to save are chosen randomly.
"""
# Perform repositioning of original distribution
if reposition:
reposition_bunch(beam_data, avg_pos + avg_mom)
# Create subset of n_part
if n_part is not None:
beam_data = get_particle_subset(beam_data,
n_part,
preserve_charge=True)
# Get beam data
x = beam_data[0]
y = beam_data[1]
xi = beam_data[2]
px = beam_data[3]
py = beam_data[4]
pz = beam_data[5]
# Save to file
data = np.column_stack((x, y, xi, px, py, pz))
file_name += '.txt'
np.savetxt(path.join(folder_path, file_name), data,
'%1.12e %1.12e %1.12e %1.12e %1.12e %1.12e')