def _prepare_monitors(self):
pp = self.pp
if hasattr(pp, 'write_buffer_every'):
write_buffer_every = pp.write_buffer_every
else:
write_buffer_every = 3
# define a bunch monitor
from PyHEADTAIL.monitors.monitors import BunchMonitor
self.bunch_monitor = BunchMonitor(
"bunch_evolution_%02d" % self.SimSt.present_simulation_part,
pp.N_turns,
{"Comment": "PyHDTL simulation"},
write_buffer_every=write_buffer_every,
)
# define a slice monitor
from PyHEADTAIL.monitors.monitors import SliceMonitor
self.slice_monitor = SliceMonitor(
"slice_evolution_%02d" % self.SimSt.present_simulation_part,
pp.N_turns,
self.slicer,
{"Comment": "PyHDTL simulation"},
write_buffer_every=write_buffer_every,
)
def test_bunchmonitor(self):
''' Test the bunchmonitor and all statistics functions
'''
self.n_macroparticles = 100 # use a high number to get acc statistics
n_steps = 5
self.monitor_fn = 'monitor'
bunchmonitor1 = BunchMonitor(self.monitor_fn + '1',
n_steps=n_steps,
write_buffer_every=2,
buffer_size=3)
bunchmonitor2 = BunchMonitor(self.monitor_fn + '2',
n_steps=n_steps,
write_buffer_every=2,
buffer_size=3)
bunch_cpu = self.create_gaussian_bunch()
bunch_gpu = self.create_gaussian_bunch()
self._monitor_cpu_gpu(bunchmonitor1, bunchmonitor2, bunch_cpu,
bunch_gpu)
def setUp(self):
self.n_turns = 10
self.bunch_fn = 'bunchm'
self.s_fn = 'sm'
self.nslices = 5
self.bunch_monitor = BunchMonitor(filename=self.bunch_fn,
n_steps=self.n_turns,
write_buffer_every=2,
buffer_size=7,
stats_to_store=['mean_x', 'macrop'])
def init_start_ring(self):
stats_to_store = [
'mean_x', 'mean_xp', 'mean_y', 'mean_yp', 'mean_z', 'mean_dp',
'sigma_x', 'sigma_y', 'sigma_z', 'sigma_dp', 'epsn_x', 'epsn_y',
'epsn_z', 'macroparticlenumber', 'i_bunch', 'i_turn'
]
n_stored_turns = len(filling_pattern) * (
self.ring_of_CPUs.N_turns / self.ring_of_CPUs.N_parellel_rings +
self.ring_of_CPUs.N_parellel_rings)
from PyHEADTAIL.monitors.monitors import BunchMonitor
self.bunch_monitor = BunchMonitor(
'bunch_monitor_ring%03d' % self.ring_of_CPUs.myring,
n_stored_turns, {'Comment': 'PyHDTL simulation'},
write_buffer_every=1,
stats_to_store=stats_to_store)
def init_master(self):
# generate a bunch
bunch = self.machine.generate_6D_Gaussian_bunch_matched(
n_macroparticles=n_macroparticles,
intensity=intensity,
epsn_x=epsn_x,
epsn_y=epsn_y,
sigma_z=sigma_z)
print 'Bunch initialized.'
# initial slicing
from PyHEADTAIL.particles.slicing import UniformBinSlicer
self.slicer = UniformBinSlicer(n_slices=n_slices, n_sigma_z=n_sigma_z)
# compute initial displacements
inj_opt = self.machine.transverse_map.get_injection_optics()
sigma_x = np.sqrt(inj_opt['beta_x'] * epsn_x / self.machine.betagamma)
sigma_y = np.sqrt(inj_opt['beta_y'] * epsn_y / self.machine.betagamma)
x_kick = x_kick_in_sigmas * sigma_x
y_kick = y_kick_in_sigmas * sigma_y
# apply initial displacement
bunch.x += x_kick
bunch.y += y_kick
# define a bunch monitor
from PyHEADTAIL.monitors.monitors import BunchMonitor
self.bunch_monitor = BunchMonitor('bunch_evolution',
N_turns,
{'Comment': 'PyHDTL simulation'},
write_buffer_every=8)
#slice for the first turn
slice_obj_list = bunch.extract_slices(self.slicer)
pieces_to_be_treated = slice_obj_list
print 'N_turns', self.N_turns
return pieces_to_be_treated
# setup transverse losses (to "protect" the ecloud)
import PyHEADTAIL.aperture.aperture as aperture
apt_xy = aperture.EllipticalApertureXY(x_aper=ecloud.impact_man.chamb.x_aper,
y_aper=ecloud.impact_man.chamb.y_aper)
machine.one_turn_map.append(apt_xy)
# generate a bunch
bunch = machine.generate_6D_Gaussian_bunch_matched(n_macroparticles=300000,
intensity=intensity,
epsn_x=epsn_x,
epsn_y=epsn_y,
sigma_z=1.35e-9 / 4 * c)
# apply initial displacement
bunch.x += x_kick
bunch.y += y_kick
# define a bunch monitor
from PyHEADTAIL.monitors.monitors import BunchMonitor
bunch_monitor = BunchMonitor('bunch_evolution.h5',
N_turns, {'Comment': 'PyHDTL simulation'},
write_buffer_every=8)
# simulate
import time
for i_turn in xrange(N_turns):
print '%s Turn %d' % (time.strftime("%d/%m/%Y %H:%M:%S",
time.localtime()), i_turn)
machine.track(bunch, verbose=False)
bunch_monitor.dump(bunch)
def run(job_id, accQ_y):
it = job_id
# SIMULATION PARAMETERS
# =====================
# Simulation parameters
n_turns = 10000
n_macroparticles = 100000 # per bunch
# MACHINE PARAMETERS
# ==================
intensity = 1e13 # protons
# intensity = 2*4e12 # protons
E0 = 71e6 # Kinetic energy [eV]
p0 = np.sqrt((m_p_MeV + E0)**2 - m_p_MeV**2) * e / c
print('Beam kinetic energy: ' + str(E0 * 1e-6) + ' MeV')
print('Beam momentum: ' + str(p0 * 1e-6 * c / e) + ' MeV/c')
accQ_x = 4.31 # Horizontal tune
# accQ_y = 3.80 # Vertical tune is an input argument
chroma = -1.4 # Chromaticity
alpha = 5.034**-2 # momentum compaction factor
circumference = 160. # [meters]
# Approximated average beta functions (lumped wake normalizations)
beta_x = circumference / (2. * np.pi * accQ_x)
beta_y = circumference / (2. * np.pi * accQ_y)
# Harmonic number for RF
h_RF = [2] # a list of harmonic number for RF
V_RF = [5e3 * 2] # a list of RF voltages
p_increment = 0.
dphi_RF = [np.pi] # a list of RF phases
# dphi_RF = 0.
# non-linear longitudinal mode includes RF, otherwise linear needs synhotron tune Q_s
longitudinal_mode = 'non-linear'
# Q_s=0.02 # Longitudinal tune
optics_mode = 'smooth'
n_segments = 1
s = None
alpha_x = None
alpha_y = None
D_x = 0
D_y = 0
charge = e
mass = m_p
name = None
app_x = 0
app_y = 0
app_xy = 0
# Creates PyHEADTAIL object for the synchotron
machine = Synchrotron(optics_mode=optics_mode,
circumference=circumference,
n_segments=n_segments,
s=s,
name=name,
alpha_x=alpha_x,
beta_x=beta_x,
D_x=D_x,
alpha_y=alpha_y,
beta_y=beta_y,
D_y=D_y,
accQ_x=accQ_x,
accQ_y=accQ_y,
Qp_x=chroma,
Qp_y=chroma,
app_x=app_x,
app_y=app_y,
app_xy=app_xy,
alpha_mom_compaction=alpha,
longitudinal_mode=longitudinal_mode,
h_RF=np.atleast_1d(h_RF),
V_RF=np.atleast_1d(V_RF),
dphi_RF=np.atleast_1d(dphi_RF),
p0=p0,
p_increment=p_increment,
charge=charge,
mass=mass)
print('')
print('machine.beta: ')
print(machine.beta)
print('')
print('')
print('machine.gamma: ')
print(machine.gamma)
print('')
epsn_x = 300e-6
epsn_y = 300e-6
sigma_z = 15 # bunch length in meters to be matched to the bucket
# Creates transverse macroparticle distribution
allbunches = machine.generate_6D_Gaussian_bunch(n_macroparticles,
intensity, epsn_x, epsn_y,
sigma_z)
# Creates longitudinal macroparticle distribution
rfb = RFBucket(circumference, machine.gamma, m_p, e, [alpha], 0., h_RF,
V_RF, dphi_RF)
rfb_matcher = RFBucketMatcher(rfb, WaterbagDistribution, sigma_z=sigma_z)
rfb_matcher.integrationmethod = 'cumtrapz'
z, dp, _, _ = rfb_matcher.generate(n_macroparticles)
np.copyto(allbunches.z, z)
np.copyto(allbunches.dp, dp)
# Slicer object, which used for wakefields and slice monitors
slicer = UniformBinSlicer(75, z_cuts=(-2. * sigma_z, 2. * sigma_z))
# WAKE FIELDS
# ===========
# Length of the wake function in turns, wake
n_turns_wake = 150
# Parameters for a resonator
# frequency is in the units of (mode-Q_frac), where
# mode: integer number of coupled bunch mode (1 matches to the observations)
# Q_frac: resonance fractional tune
f_r = (1 - 0.83) * 1. / (circumference / (c * machine.beta))
Q = 15
R = 1.0e6
# Renator wake object, which is added to the one turn map
wakes = CircularResonator(R, f_r, Q, n_turns_wake=n_turns_wake)
wake_field = WakeField(slicer, wakes)
machine.one_turn_map.append(wake_field)
# CREATE MONITORS
# ===============
simulation_parameters_dict = {'gamma' : machine.gamma,\
'intensity' : intensity,\
'Qx' : accQ_x,\
'Qy' : accQ_y,\
# 'Qs' : Q_s,\
'beta_x' : beta_x,\
'beta_y' : beta_y,\
# 'beta_z' : bucket.beta_z,\
'epsn_x' : epsn_x,\
'epsn_y' : epsn_y,\
'sigma_z' : sigma_z,\
}
# Bunch monitor strores bunch average positions for all the bunches
bunchmonitor = BunchMonitor(outputpath + '/bunchmonitor_{:04d}'.format(it),
n_turns,
simulation_parameters_dict,
write_buffer_every=32,
buffer_size=32)
# Slice monitors saves slice-by-slice data for each bunch
slicemonitor = SliceMonitor(outputpath +
'/slicemonitor_{:01d}_{:04d}'.format(0, it),
60,
slicer,
simulation_parameters_dict,
write_buffer_every=60,
buffer_size=60)
# Counter for a number of turns stored to slice monitors
s_cnt = 0
# TRACKING LOOP
# =============
monitor_active = False
print('\n--> Begin tracking...\n')
for i in range(n_turns):
t0 = time.clock()
# Tracks beam through the one turn map simulation map
machine.track(allbunches)
# Stores bunch mean coordinate values
bunchmonitor.dump(allbunches)
# If the total oscillation amplitude of bunches exceeds the threshold
# or the simulation is running on the last turns, triggers the slice
# monitors for headtail motion data
if (allbunches.mean_x() > 1e-1 or allbunches.mean_y() > 1e-1 or i >
(n_turns - 64)):
monitor_active = True
# saves slice monitor data if monitors are activated and less than
# 64 turns have been stored
if monitor_active and s_cnt < 64:
slicemonitor.dump(allbunches)
s_cnt += 1
elif s_cnt == 64:
break
# If this script is runnin on the first processor, prints the current
# bunch coordinates and emittances
if (i % 100 == 0):
print(
'{:4d} \t {:+3e} \t {:+3e} \t {:+3e} \t {:3e} \t {:3e} \t {:3f} \t {:3f} \t {:3f} \t {:3s}'
.format(i, allbunches.mean_x(), allbunches.mean_y(),
allbunches.mean_z(), allbunches.epsn_x(),
allbunches.epsn_y(), allbunches.epsn_z(),
allbunches.sigma_z(), allbunches.sigma_dp(),
str(time.clock() - t0)))
# apply initial displacement
bunch.x += x_kick
bunch.y += y_kick
# Manage multi-job operation
import Save_Load_Status as SLS
SimSt = SLS.SimulationStatus(N_turns_per_run=N_turns_per_run, N_turns_target=N_turns_target, jobid=jobid,check_for_resubmit=True, queue=queue)
SimSt.before_simulation()
# define a bunch monitor
from PyHEADTAIL.monitors.monitors import BunchMonitor
bunch_monitor = BunchMonitor('bunch_evolution_%02d'%SimSt.present_simulation_part, N_turns_per_run, {'Comment':'PyHDTL simulation'},
write_buffer_every = 8)
if not SimSt.first_run:
# If not first part, load saved bunch and ecloud
bunch = SLS.beam_from_h5status('bunch_status_part%02d.h5'%(SimSt.present_simulation_part-1))
SLS.reinit_ecloud_from_h5status('ecloud_init_status.h5', ecloud)
else:
#save ecloud particles status
SLS.dump_ecloud_status(ecloud, 'ecloud_init_status.h5')
# simulate
import time
for i_turn in xrange(N_turns_per_run):
print '%s Turn %d'%(time.strftime("%d/%m/%Y %H:%M:%S", time.localtime()), i_turn)
machine.track(bunch, verbose = False)
def init_master(self):
# Manage multi-job operation
if pp.footprint_mode:
if pp.N_turns != pp.N_turns_target:
raise ValueError(
'In footprint mode you need to set N_turns_target=N_turns_per_run!'
)
import PyPARIS_sim_class.Save_Load_Status as SLS
SimSt = SLS.SimulationStatus(N_turns_per_run=pp.N_turns,
check_for_resubmit=True,
N_turns_target=pp.N_turns_target)
SimSt.before_simulation()
self.SimSt = SimSt
# generate a bunch
if pp.footprint_mode:
self.bunch = self.machine.generate_6D_Gaussian_bunch_matched(
n_macroparticles=pp.n_macroparticles_for_footprint_track,
intensity=pp.intensity,
epsn_x=pp.epsn_x,
epsn_y=pp.epsn_y,
sigma_z=pp.sigma_z)
elif SimSt.first_run:
if pp.bunch_from_file is not None:
print 'Loading bunch from file %s ...' % pp.bunch_from_file
with h5py.File(pp.bunch_from_file, 'r') as fid:
self.bunch = self.buffer_to_piece(
np.array(fid['bunch']).copy())
print 'Bunch loaded from file.\n'
else:
self.bunch = self.machine.generate_6D_Gaussian_bunch_matched(
n_macroparticles=pp.n_macroparticles,
intensity=pp.intensity,
epsn_x=pp.epsn_x,
epsn_y=pp.epsn_y,
sigma_z=pp.sigma_z)
# compute initial displacements
inj_opt = self.machine.transverse_map.get_injection_optics()
sigma_x = np.sqrt(inj_opt['beta_x'] * pp.epsn_x /
self.machine.betagamma)
sigma_y = np.sqrt(inj_opt['beta_y'] * pp.epsn_y /
self.machine.betagamma)
x_kick = pp.x_kick_in_sigmas * sigma_x
y_kick = pp.y_kick_in_sigmas * sigma_y
# apply initial displacement
if not pp.footprint_mode:
self.bunch.x += x_kick
self.bunch.y += y_kick
print 'Bunch initialized.'
else:
print 'Loading bunch from file...'
with h5py.File(
'bunch_status_part%02d.h5' %
(SimSt.present_simulation_part - 1), 'r') as fid:
self.bunch = self.buffer_to_piece(
np.array(fid['bunch']).copy())
print 'Bunch loaded from file.'
# initial slicing
self.slicer = UniformBinSlicer(n_slices=pp.n_slices,
z_cuts=(-pp.z_cut, pp.z_cut))
# define a bunch monitor
from PyHEADTAIL.monitors.monitors import BunchMonitor
self.bunch_monitor = BunchMonitor(
'bunch_evolution_%02d' % self.SimSt.present_simulation_part,
pp.N_turns, {'Comment': 'PyHDTL simulation'},
write_buffer_every=3)
# define a slice monitor
from PyHEADTAIL.monitors.monitors import SliceMonitor
self.slice_monitor = SliceMonitor(
'slice_evolution_%02d' % self.SimSt.present_simulation_part,
pp.N_turns,
self.slicer, {'Comment': 'PyHDTL simulation'},
write_buffer_every=3)
#slice for the first turn
slice_obj_list = self.bunch.extract_slices(self.slicer)
pieces_to_be_treated = slice_obj_list
print 'N_turns', self.N_turns
if pp.footprint_mode:
self.recorded_particles = ParticleTrajectories(
pp.n_macroparticles_for_footprint_track, self.N_turns)
return pieces_to_be_treated
def run(intensity, chroma=0, i_oct=0):
'''Arguments:
- intensity: integer number of charges in beam
- chroma: first-order chromaticity Q'_{x,y}, identical
for both transverse planes
- i_oct: octupole current in A (positive i_oct means
LOF = i_oct > 0 and LOD = -i_oct < 0)
'''
# BEAM AND MACHINE PARAMETERS
# ============================
from LHC import LHC
# energy set above will enter get_nonlinear_params p0
assert machine_configuration == 'LHC-injection'
machine = LHC(n_segments=1,
machine_configuration=machine_configuration,
**get_nonlinear_params(chroma=chroma,
i_oct=i_oct,
p0=0.45e12 * e / c))
# BEAM
# ====
epsn_x = 3.e-6 # normalised horizontal emittance
epsn_y = 3.e-6 # normalised vertical emittance
sigma_z = 1.2e-9 * machine.beta * c / 4. # RMS bunch length in meters
bunch = machine.generate_6D_Gaussian_bunch(n_macroparticles,
intensity,
epsn_x,
epsn_y,
sigma_z=sigma_z,
matched=True)
print("\n--> Bunch length and emittance: {:g} m, {:g} eVs.".format(
bunch.sigma_z(), bunch.epsn_z()))
# CREATE BEAM SLICERS
# ===================
slicer_for_slicemonitor = UniformBinSlicer(50,
z_cuts=(-3 * sigma_z,
3 * sigma_z))
slicer_for_wakefields = UniformBinSlicer(
50,
z_cuts=(-3 * sigma_z, 3 * sigma_z),
circumference=machine.circumference,
h_bunch=machine.h_bunch)
print("Slice")
# CREATE WAKES
# ============
wake_table1 = WakeTable(
wakefile,
[
'time',
'dipole_x',
'dipole_y',
# 'quadrupole_x', 'quadrupole_y',
'noquadrupole_x',
'noquadrupole_y',
# 'dipole_xy', 'dipole_yx',
'nodipole_xy',
'nodipole_yx',
])
wake_field = WakeField(slicer_for_wakefields, wake_table1, mpi=True)
# CREATE DAMPER
# =============
dampingtime = 50.
gain = 2. / dampingtime
damper = IdealBunchFeedback(gain)
# CREATE MONITORS
# ===============
try:
bucket = machine.longitudinal_map.get_bucket(bunch)
except AttributeError:
bucket = machine.rfbucket
simulation_parameters_dict = {
'gamma': machine.gamma,
'intensity': intensity,
'Qx': machine.Q_x,
'Qy': machine.Q_y,
'Qs': bucket.Q_s,
'beta_x': bunch.beta_Twiss_x(),
'beta_y': bunch.beta_Twiss_y(),
'beta_z': bucket.beta_z,
'epsn_x': bunch.epsn_x(),
'epsn_y': bunch.epsn_y(),
'sigma_z': bunch.sigma_z(),
}
bunchmonitor = BunchMonitor(
outputpath + '/bunchmonitor_{:04d}_chroma={:g}'.format(it, chroma),
n_turns,
simulation_parameters_dict,
write_buffer_to_file_every=512,
buffer_size=4096)
slicemonitor = SliceMonitor(
outputpath + '/slicemonitor_{:04d}_chroma={:g}'.format(it, chroma),
n_turns_slicemon,
slicer_for_slicemonitor,
simulation_parameters_dict,
write_buffer_to_file_every=1,
buffer_size=n_turns_slicemon)
# TRACKING LOOP
# =============
# machine.one_turn_map.append(damper)
machine.one_turn_map.append(wake_field)
# for slice statistics monitoring:
s_cnt = 0
monitorswitch = False
print('\n--> Begin tracking...\n')
# GO!!!
for i in range(n_turns):
t0 = time.clock()
# track the beam around the machine for one turn:
machine.track(bunch)
ex, ey, ez = bunch.epsn_x(), bunch.epsn_y(), bunch.epsn_z()
mx, my, mz = bunch.mean_x(), bunch.mean_y(), bunch.mean_z()
# monitor the bunch statistics (once per turn):
bunchmonitor.dump(bunch)
# if the centroid becomes unstable (>1cm motion)
# then monitor the slice statistics:
if not monitorswitch:
if mx > 1e-2 or my > 1e-2 or i > n_turns - n_turns_slicemon:
print("--> Activate slice monitor")
monitorswitch = True
else:
if s_cnt < n_turns_slicemon:
slicemonitor.dump(bunch)
s_cnt += 1
# stop the tracking as soon as we have not-a-number values:
if not all(np.isfinite(c) for c in [ex, ey, ez, mx, my, mz]):
print('*** STOPPING SIMULATION: non-finite bunch stats!')
break
# print status all 1000 turns:
if i % 100 == 0:
t1 = time.clock()
print('Emittances: ({:.3g}, {:.3g}, {:.3g}) '
'& Centroids: ({:.3g}, {:.3g}, {:.3g})'
'@ turn {:d}, {:g} ms, {:s}'.format(
ex, ey, ez, mx, my, mz, i, (t1 - t0) * 1e3,
time.strftime("%d/%m/%Y %H:%M:%S", time.localtime())))
print('\n*** Successfully completed!')
def perform_bunch_operations_at_start_ring(self, bunch):
if self.bunch_monitor is None:
simstate_part = bunch.slice_info['simstate_part']
stats_to_store = [
'mean_x', 'mean_xp', 'mean_y', 'mean_yp', 'mean_z', 'mean_dp',
'sigma_x', 'sigma_y', 'sigma_z','sigma_dp', 'epsn_x', 'epsn_y',
'epsn_z', 'macroparticlenumber',
'i_bunch', 'i_turn']
n_stored_turns = np.sum(np.array(filling_pattern)>0)*(\
self.ring_of_CPUs.N_turns/self.ring_of_CPUs.N_parellel_rings\
+ self.ring_of_CPUs.N_parellel_rings)
from PyHEADTAIL.monitors.monitors import BunchMonitor
self.bunch_monitor = BunchMonitor(
'bunch_monitor_part%03d_ring%03d'%(
simstate_part, self.ring_of_CPUs.myring),
n_stored_turns,
{'Comment':'PyHDTL simulation'},
write_buffer_every = 1,
stats_to_store = stats_to_store)
# define a slice monitor
z_left = bunch.slice_info['z_bin_left'] - bunch.slice_info['z_bin_center']
z_right = bunch.slice_info['z_bin_right'] - bunch.slice_info['z_bin_center']
slicer = UniformBinSlicer(n_slices = self.n_slices_per_bunch, z_cuts=(z_left, z_right))
from PyHEADTAIL.monitors.monitors import SliceMonitor
self.slice_monitor = SliceMonitor('slice_monitor_part%03d_ring%03d'%(
simstate_part, self.ring_of_CPUs.myring),
n_stored_turns, slicer, {'Comment':'PyHDTL simulation'},
write_buffer_every = 1, bunch_stats_to_store=stats_to_store,
slice_stats_to_store='mean_x mean_y mean_z n_macroparticles_per_slice'.split())
# Save bunch properties
if bunch.macroparticlenumber > 0 and bunch.slice_info['i_turn'] < self.N_turns:
# Attach bound methods to monitor i_bunch and i_turns
bunch.i_bunch = types.MethodType(lambda ss: ss.slice_info['i_bunch'], bunch)
bunch.i_turn = types.MethodType(lambda ss: ss.slice_info['i_turn'], bunch)
self.bunch_monitor.dump(bunch)
# Monitor slice wrt bunch center
bunch.z -= bunch.slice_info['z_bin_center']
self.slice_monitor.dump(bunch)
bunch.z += bunch.slice_info['z_bin_center']
# Save full beam at user-defined positions
if bunch.slice_info['i_turn'] in self.save_beam_at_turns:
dirname = 'bunch_states_turn%d'%bunch.slice_info['i_turn']
import PyPARIS.gen_multibunch_beam as gmb
gmb.save_bunch_to_folder(bunch, dirname)
# Save full beam at end simulation
if bunch.slice_info['i_turn'] == self.N_turns:
# PyPARIS wants N_turns to be a multiple of N_parellel_rings
assert(self.ring_of_CPUs.I_am_the_master)
dirname = 'beam_status_part%02d'%(self.SimSt.present_simulation_part)
import PyPARIS.gen_multibunch_beam as gmb
gmb.save_bunch_to_folder(bunch, dirname)
if bunch.slice_info['i_bunch'] == bunch.slice_info['N_bunches_tot_beam'] - 1:
if not self.SimSt.first_run:
os.system('rm -r beam_status_part%02d' % (self.SimSt.present_simulation_part - 1))
self.SimSt.after_simulation()
def run(intensity, chroma=0, i_oct=0):
'''Arguments:
- intensity: integer number of charges in beam
- chroma: first-order chromaticity Q'_{x,y}, identical
for both transverse planes
- i_oct: octupole current in A (positive i_oct means
LOF = i_oct > 0 and LOD = -i_oct < 0)
'''
# BEAM AND MACHINE PARAMETERS
# ============================
from LHC import LHC
# energy set above will enter get_nonlinear_params p0
assert machine_configuration == 'LHC-injection'
machine = LHC(n_segments=1,
machine_configuration=machine_configuration,
**get_nonlinear_params(chroma=chroma,
i_oct=i_oct,
p0=0.45e12 * e / c))
# BEAM
# ====
#print(filling_scheme)
epsn_x = 3.e-6 # normalised horizontal emittance
epsn_y = 3.e-6 # normalised vertical emittance
sigma_z = 1.2e-9 * machine.beta * c / 4. # RMS bunch length in meters
beam = machine.generate_6D_Gaussian_bunch(n_macroparticles,
intensity,
epsn_x,
epsn_y,
sigma_z=sigma_z,
matched=True,
filling_scheme=filling_scheme)
bunch_list = beam.split_to_views()
for b in bunch_list:
if b.bucket_id[0] < batch_length:
b.x += 1e-3
b.y += 1e-3
bunch = bunch_list[0]
print("\n--> Bunch length and emittance: {:g} m, {:g} eVs.".format(
bunch.sigma_z(), bunch.epsn_z()))
# CREATE BEAM SLICERS
# ===================
slicer_for_slicemonitor = UniformBinSlicer(50,
z_cuts=(-3 * sigma_z,
3 * sigma_z))
slicer_for_wakefields = UniformBinSlicer(
50,
z_cuts=(-3 * sigma_z, 3 * sigma_z),
circumference=machine.circumference,
h_bunch=machine.h_bunch)
# CREATE WAKES
# ============
wake_table1 = WakeTable(
wakefile,
[
'time',
'dipole_x',
'dipole_y',
# 'quadrupole_x', 'quadrupole_y',
'noquadrupole_x',
'noquadrupole_y',
# 'dipole_xy', 'dipole_yx',
'nodipole_xy',
'nodipole_yx',
])
wake_field = WakeField(slicer_for_wakefields,
wake_table1,
mpi='linear_mpi_full_ring_fft')
# CREATE DAMPER
# =============
from PyHEADTAIL_feedback.feedback import OneboxFeedback
from PyHEADTAIL_feedback.processors.multiplication import ChargeWeighter
from PyHEADTAIL_feedback.processors.register import TurnFIRFilter
from PyHEADTAIL_feedback.processors.convolution import Lowpass, FIRFilter
from PyHEADTAIL_feedback.processors.resampling import DAC, HarmonicADC, BackToOriginalBins, Upsampler
from MD4063_filter_functions import calculate_coefficients_3_tap, calculate_hilbert_notch_coefficients
# from PyHEADTAIL_feedback.processors.addition import NoiseGenerator
dampingtime = 20.
gain = 2. / dampingtime
lowpass100kHz = [
1703, 1169, 1550, 1998, 2517, 3108, 3773, 4513, 5328, 6217, 7174, 8198,
9282, 10417, 11598, 12813, 14052, 15304, 16555, 17793, 19005, 20176,
21294, 22345, 23315, 24193, 24969, 25631, 26171, 26583, 26860, 27000,
27000, 26860, 26583, 26171, 25631, 24969, 24193, 23315, 22345, 21294,
20176, 19005, 17793, 16555, 15304, 14052, 12813, 11598, 10417, 9282,
8198, 7174, 6217, 5328, 4513, 3773, 3108, 2517, 1998, 1550, 1169, 1703
]
lowpassEnhanced = [
490, 177, -478, -820, -370, 573, 1065, 428, -909, -1632, -799, 1015,
2015, 901, -1592, -3053, -1675, 1642, 3670, 1841, -2828, -6010, -3929,
2459, 7233, 4322, -6384, -17305, -18296, -5077, 16097, 32000, 32000,
16097, -5077, -18296, -17305, -6384, 4322, 7233, 2459, -3929, -6010,
-2828, 1841, 3670, 1642, -1675, -3053, -1592, 901, 2015, 1015, -799,
-1632, -909, 428, 1065, 573, -370, -820, -478, 177, 490
]
lowpass20MHz = [
38, 118, 182, 112, -133, -389, -385, -45, 318, 257, -259, -665, -361,
473, 877, 180, -996, -1187, 162, 1670, 1329, -954, -2648, -1219, 2427,
4007, 419, -5623, -6590, 2893, 19575, 32700, 32700, 19575, 2893, -6590,
-5623, 419, 4007, 2427, -1219, -2648, -954, 1329, 1670, 162, -1187,
-996, 180, 877, 473, -361, -665, -259, 257, 318, -45, -385, -389, -133,
112, 182, 118, 38
]
phaseEqualizer = [
2, 4, 7, 10, 12, 16, 19, 22, 27, 31, 36, 42, 49, 57, 67, 77, 90, 104,
121, 141, 164, 191, 223, 261, 305, 358, 422, 498, 589, 700, 836, 1004,
1215, 1483, 1832, 2301, 2956, 3944, 5600, 9184, 25000, -16746, -4256,
-2056, -1195, -769, -523, -372, -271, -202, -153, -118, -91, -71, -56,
-44, -34, -27, -20, -15, -11, -7, -4, -1
]
FIR_phase_filter = np.loadtxt(
'./injection_error_input_data/FIR_Phase_40MSPS.csv')
FIR_phase_filter = np.array(phaseEqualizer)
FIR_phase_filter = FIR_phase_filter / float(np.sum(FIR_phase_filter))
FIR_gain_filter = np.array(lowpass20MHz)
FIR_gain_filter = FIR_gain_filter / float(np.sum(lowpass20MHz))
# Cut-off frequency of the kicker system
fc = 1.0e6
ADC_bits = 16
ADC_range = (-1e-3, 1e-3)
# signal processing delay in turns before the first measurements is applied
delay = 1
extra_adc_bins = 10
# betatron phase advance between the pickup and the kicker. The value 0.25
# corresponds to the 90 deg phase change from from the pickup measurements
# in x-plane to correction kicks in xp-plane.
additional_phase = 0.25 # Kicker-to-pickup phase advance 0 deg
# additional_phase = 0. # Kicker-to-pickup phase advance 90 deg
f_RF = 1. / (machine.circumference / c / (float(machine.h_RF)))
# turn_phase_filter_x = calculate_hilbert_notch_coefficients(machine.Q_x, delay, additional_phase)
# turn_phase_filter_y = calculate_hilbert_notch_coefficients(machine.Q_y, delay, additional_phase)
turn_phase_filter_x = calculate_coefficients_3_tap(machine.Q_x, delay,
additional_phase)
turn_phase_filter_y = calculate_coefficients_3_tap(machine.Q_y, delay,
additional_phase)
print('f_RF: ' + str(f_RF))
processors_detailed_x = [
Bypass(),
ChargeWeighter(normalization='segment_average'),
# NoiseGenerator(RMS_noise_level, debug=False),
HarmonicADC(1 * f_RF / 10.,
ADC_bits,
ADC_range,
n_extras=extra_adc_bins),
TurnFIRFilter(turn_phase_filter_x, machine.Q_x, delay=delay),
FIRFilter(FIR_phase_filter, zero_tap=40),
Upsampler(3, [1.5, 1.5, 0]),
FIRFilter(FIR_gain_filter, zero_tap=34),
DAC(ADC_bits, ADC_range),
Lowpass(fc, f_cutoff_2nd=10 * fc),
BackToOriginalBins(),
]
processors_detailed_y = [
Bypass(),
ChargeWeighter(normalization='segment_average'),
# NoiseGenerator(RMS_noise_level, debug=False),
HarmonicADC(1 * f_RF / 10.,
ADC_bits,
ADC_range,
n_extras=extra_adc_bins),
TurnFIRFilter(turn_phase_filter_y, machine.Q_y, delay=delay),
FIRFilter(FIR_phase_filter, zero_tap=40),
Upsampler(3, [1.5, 1.5, 0]),
FIRFilter(FIR_gain_filter, zero_tap=34),
DAC(ADC_bits, ADC_range),
Lowpass(fc, f_cutoff_2nd=10 * fc),
BackToOriginalBins(),
]
# Kicker-to-pickup phase advance 0 deg
damper = OneboxFeedback(gain,
slicer_for_wakefields,
processors_detailed_x,
processors_detailed_y,
pickup_axis='displacement',
kicker_axis='divergence',
mpi=True,
beta_x=machine.beta_x,
beta_y=machine.beta_y)
# # Kicker-to-pickup phase advance 90 deg
# damper = OneboxFeedback(gain,slicer_for_wakefields,
# processors_detailed_x,processors_detailed_y, mpi=True,
# pickup_axis='displacement', kicker_axis='displacement')
# CREATE MONITORS
# ===============
try:
bucket = machine.longitudinal_map.get_bucket(bunch)
except AttributeError:
bucket = machine.rfbucket
simulation_parameters_dict = {
'gamma': machine.gamma,
'intensity': intensity,
'Qx': machine.Q_x,
'Qy': machine.Q_y,
'Qs': bucket.Q_s,
'beta_x': bunch.beta_Twiss_x(),
'beta_y': bunch.beta_Twiss_y(),
'beta_z': bucket.beta_z,
'epsn_x': bunch.epsn_x(),
'epsn_y': bunch.epsn_y(),
'sigma_z': bunch.sigma_z(),
}
bunchmonitor = BunchMonitor(
outputpath + '/bunchmonitor_{:04d}_chroma={:g}'.format(it, chroma),
n_turns,
simulation_parameters_dict,
write_buffer_to_file_every=512,
buffer_size=4096,
mpi=True,
filling_scheme=filling_scheme)
# slicemonitor = SliceMonitor(
# outputpath+'/slicemonitor_{:04d}_chroma={:g}_bunch_{:04d}'.format(it, chroma, bunch.bucket_id[0]),
# n_turns_slicemon,
# slicer_for_slicemonitor, simulation_parameters_dict,
# write_buffer_to_file_every=1, buffer_size=n_turns_slicemon)
# TRACKING LOOP
# =============
machine.one_turn_map.append(damper)
machine.one_turn_map.append(wake_field)
# for slice statistics monitoring:
s_cnt = 0
monitorswitch = False
print('\n--> Begin tracking...\n')
# GO!!!
for i in range(n_turns):
t0 = time.clock()
# track the beam around the machine for one turn:
machine.track(beam)
bunch_list = beam.split_to_views()
bunch = bunch_list[0]
ex, ey, ez = bunch.epsn_x(), bunch.epsn_y(), bunch.epsn_z()
mx, my, mz = bunch.mean_x(), bunch.mean_y(), bunch.mean_z()
# monitor the bunch statistics (once per turn):
bunchmonitor.dump(beam)
# if the centroid becomes unstable (>1cm motion)
# then monitor the slice statistics:
if not monitorswitch:
if mx > 1e-2 or my > 1e-2 or i > n_turns - n_turns_slicemon:
print("--> Activate slice monitor")
monitorswitch = True
else:
if s_cnt < n_turns_slicemon:
# slicemonitor.dump(bunch)
s_cnt += 1
# stop the tracking as soon as we have not-a-number values:
if not all(np.isfinite(c) for c in [ex, ey, ez, mx, my, mz]):
print('*** STOPPING SIMULATION: non-finite bunch stats!')
break
# print status all 1000 turns:
if i % 100 == 0:
t1 = time.clock()
print('Emittances: ({:.3g}, {:.3g}, {:.3g}) '
'& Centroids: ({:.3g}, {:.3g}, {:.3g})'
'@ turn {:d}, {:g} ms, {:s}'.format(
ex, ey, ez, mx, my, mz, i, (t1 - t0) * 1e3,
time.strftime("%d/%m/%Y %H:%M:%S", time.localtime())))
print('\n*** Successfully completed!')
def run():
# HELPERS
def read_all_data(bfile, sfile, pfile):
bunchdata = hp.File(bfile + '.h5')
slicedata = hp.File(sfile + '.h5')
particledata = hp.File(pfile + '.h5part')
# Bunchdata
bdata = bunchdata['Bunch']
n_turns = len(bdata['mean_x'])
_ = np.empty(n_turns)
for key in list(bdata.keys()):
_[:] = bdata[key][:]
# Slicedata
sdata = slicedata['Slices']
sbdata = slicedata['Bunch']
n_turns = len(sbdata['mean_x'])
_ = np.empty(n_turns)
for key in list(sbdata.keys()):
_[:] = sbdata[key][:]
n_slices, n_turns = sdata['mean_x'].shape
_ = np.empty((n_slices, n_turns))
for key in list(sdata.keys()):
_[:, :] = sdata[key][:, :]
# Particledata
pdata = particledata['Step#0']
n_particles = len(pdata['x'])
n_steps = len(list(particledata.keys()))
_ = np.empty(n_particles)
for i in range(n_steps):
step = 'Step#%d' % i
for key in list(particledata[step].keys()):
_[:] = particledata[step][key][:]
bunchdata.close()
slicedata.close()
particledata.close()
def read_n_plot_data(bfile, sfile, pfile):
bunchdata = hp.File(bfile + '.h5')
slicedata = hp.File(sfile + '.h5')
particledata = hp.File(pfile + '.h5part')
fig = plt.figure(figsize=(16, 16))
ax1 = fig.add_subplot(311)
ax2 = fig.add_subplot(312)
ax3 = fig.add_subplot(313)
ax1.plot(bunchdata['Bunch']['mean_x'][:])
ax2.plot(slicedata['Slices']['mean_x'][:, :])
ax3.plot(particledata['Step#0']['x'][:])
#ax2.plot(slicedata[])
plt.show()
bunchdata.close()
slicedata.close()
particledata.close()
def generate_bunch(n_macroparticles, alpha_x, alpha_y, beta_x, beta_y,
alpha_0, Q_s, R):
intensity = 1.05e11
sigma_z = 0.059958
gamma = 3730.26
eta = alpha_0 - 1. / gamma**2
gamma_t = 1. / np.sqrt(alpha_0)
p0 = np.sqrt(gamma**2 - 1) * m_p * c
beta_z = eta * R / Q_s
epsn_x = 3.75e-6 # [m rad]
epsn_y = 3.75e-6 # [m rad]
epsn_z = 4 * np.pi * sigma_z**2 * p0 / (
beta_z * e
) # WITH OR WITHOUT 4 PIjQuery202047649151738733053_1414145430832?
bunch = generators.generate_Gaussian6DTwiss(
macroparticlenumber=n_macroparticles,
intensity=intensity,
charge=e,
gamma=gamma,
mass=m_p,
circumference=C,
alpha_x=alpha_x,
beta_x=beta_x,
epsn_x=epsn_x,
alpha_y=alpha_y,
beta_y=beta_y,
epsn_y=epsn_y,
beta_z=beta_z,
epsn_z=epsn_z)
return bunch
# In[4]:
# Basic parameters.
n_turns = 2
n_segments = 5
n_macroparticles = 500
Q_x = 64.28
Q_y = 59.31
Q_s = 0.0020443
C = 26658.883
R = C / (2. * np.pi)
alpha_x_inj = 0.
alpha_y_inj = 0.
beta_x_inj = 66.0064
beta_y_inj = 71.5376
alpha_0 = 0.0003225
# ##### Things tested: - Instantiation of the three monitors BunchMonitor, SliceMonitor, ParticleMonitor. - dump(beam) method for all the three. - read data from file. Plot example data from Bunch-, Slice- and Particle-Monitors. - SliceMonitor: does it handle/request slice_sets correctly? - Buffers are on for Bunch- and SliceMonitors. Look at one of the files in hdfview to check the units, attributes, ...
# In[5]:
# Parameters for transverse map.
s = np.arange(0, n_segments + 1) * C / n_segments
alpha_x = alpha_x_inj * np.ones(n_segments)
beta_x = beta_x_inj * np.ones(n_segments)
D_x = np.zeros(n_segments)
alpha_y = alpha_y_inj * np.ones(n_segments)
beta_y = beta_y_inj * np.ones(n_segments)
D_y = np.zeros(n_segments)
# In[6]:
# Instantiate BunchMonitor, SliceMonitor and ParticleMonitor and dump data to file.
bunch = generate_bunch(n_macroparticles, alpha_x_inj, alpha_y_inj,
beta_x_inj, beta_y_inj, alpha_0, Q_s, R)
trans_map = TransverseMap(s, alpha_x, beta_x, D_x, alpha_y, beta_y, D_y,
Q_x, Q_y)
# Slicer config for SliceMonitor.
unibin_slicer = UniformBinSlicer(n_slices=10, n_sigma_z=None, z_cuts=None)
# Monitors
bunch_filename = 'bunch_mon'
slice_filename = 'slice_mon'
particle_filename = 'particle_mon'
bunch_monitor = BunchMonitor(filename=bunch_filename,
n_steps=n_turns,
parameters_dict={'Q_x': Q_x},
write_buffer_every=20)
slice_monitor = SliceMonitor(filename=slice_filename,
n_steps=n_turns,
slicer=unibin_slicer,
parameters_dict={'Q_x': Q_x},
write_buffer_every=20)
particle_monitor = ParticleMonitor(filename=particle_filename,
stride=10,
parameters_dict={'Q_x': Q_x})
arrays_dict = {}
map_ = trans_map
for i in range(n_turns):
for m_ in map_:
m_.track(bunch)
bunch_monitor.dump(bunch)
slice_monitor.dump(bunch)
slice_set_pmon = bunch.get_slices(unibin_slicer)
arrays_dict.update({
'slidx': slice_set_pmon.slice_index_of_particle,
'zz': bunch.z
})
particle_monitor.dump(bunch, arrays_dict)
read_all_data(bunch_filename, slice_filename, particle_filename)
os.remove(bunch_filename + '.h5')
os.remove(slice_filename + '.h5')
os.remove(particle_filename + '.h5part')
