density_model=('MSIS00', ('Tokyo', 'October')),
theta_deg=0)
cos_theta = 0.95
theta = numpy.arccos(cos_theta) * 180 / numpy.pi
mceq.set_theta_deg(theta)
altitude = numpy.array((30., ))
X_grid = mceq.density_model.h2X(altitude * 1E+02)
def weight(xmat, egrid, name, c):
return (1 + c) * numpy.ones_like(xmat)
mceq.set_mod_pprod(2212, 211, weight, ('a', 0.141)) # Coefficients taken
mceq.set_mod_pprod(2212, -211, weight,
('a', 0.116)) # from table 2 of Yanez et
mceq.set_mod_pprod(2212, 321, weight, ('a', 0.402)) # al.
mceq.set_mod_pprod(2212, -321, weight, ('a', 0.583))
mceq.regenerate_matrices(skip_decay_matrix=True)
mceq.solve(int_grid=X_grid)
energy = mceq.e_grid
flux = mceq.get_solution('mu-', grid_idx=0)
flux += mceq.get_solution('mu+', grid_idx=0)
# Plot the result
plot.figure()
plot.semilogx(energy, energy**3 * flux, 'k--')
class nuVeto(object):
"""Class for computing the neutrino passing fraction i.e. (1-(Veto probability))"""
def __init__(self,
costh,
pmodel=(pm.HillasGaisser2012, 'H3a'),
hadr='SIBYLL2.3c',
barr_mods=(),
depth=1950 * Units.m,
density=('CORSIKA', ('SouthPole', 'December')),
debug_level=1):
"""Initializes the nuVeto object for a particular costheta, CR Flux,
hadronic model, barr parameters, and depth
Note:
A separate MCEq instance needs to be created for each
combination of __init__'s arguments. To access pmodel and hadr,
use mceq.pm_params and mceq.yields_params
Args:
costh (float): Cos(theta), the cosine of the neutrino zenith at the detector
pmodel (tuple(CR model class, arguments)): CR Flux
hadr (str): hadronic interaction model
barr_mods: barr parameters
depth (float): the depth at which the veto probability is computed below the ice
"""
self.costh = costh
self.pmodel = pmodel
self.geom = Geometry(depth)
theta = np.degrees(np.arccos(self.geom.cos_theta_eff(self.costh)))
if density[0] == 'MSIS00_IC':
print('Passing "MSIS00_IC" assumes IceCube-centered coordinates, '
'which obviates the depth used here. Switching to "MSIS00" '
'for identical results.')
density = ('MSIS00', density[1])
config.debug_level = debug_level
# config.enable_em = False
config.enable_muon_energy_loss = False
config.return_as = 'total energy'
config.adv_set['allowed_projectiles'] = [
2212, 2112, 211, -211, 321, -321, 130, -2212, -2112
] #, 11, 22]
config.ctau = 2.5
self.mceq = MCEqRun(
# provide the string of the interaction model
interaction_model=hadr,
# primary cosmic ray flux model
# support a tuple (primary model class (not instance!), arguments)
primary_model=pmodel,
# zenith angle \theta in degrees, measured positively from vertical direction at surface
theta_deg=theta,
# atmospheric density model
density_model=density)
if len(barr_mods) > 0:
for barr_mod in barr_mods:
# Modify proton-air -> mod[0]
self.mceq.set_mod_pprod(2212, BARR[barr_mod[0]].pdg, barr_unc,
barr_mod)
# Populate the modifications to the matrices by re-filling the interaction matrix
self.mceq.regenerate_matrices(skip_decay_matrix=True)
X_vec = np.logspace(np.log10(2e-3),
np.log10(self.mceq.density_model.max_X), 12)
self.dX_vec = np.diff(X_vec)
self.X_vec = 10**centers(np.log10(X_vec))
@staticmethod
def categ_to_mothers(categ, daughter):
"""Get the parents for this category"""
rcharge = '-' if 'bar' in daughter else '+'
lcharge = '+' if 'bar' in daughter else '-'
rbar = 'bar' if 'bar' in daughter else ''
lbar = '' if 'bar' in daughter else 'bar'
if categ == 'conv':
mothers = ['pi' + rcharge, 'K' + rcharge, 'K_L0']
if 'nu_tau' in daughter:
mothers = []
elif 'nu_e' in daughter:
mothers.extend(['K_S0', 'mu' + rcharge])
elif 'nu_mu' in daughter:
mothers.extend(['mu' + lcharge])
elif categ == 'pr':
if 'nu_tau' in daughter:
mothers = ['D' + rcharge, 'D_s' + rcharge]
else:
mothers = ['D' + rcharge, 'D_s' + rcharge, 'D' + rbar + '0'
] #, 'Lambda'+lbar+'0']#, 'Lambda_c'+rcharge]
elif categ == 'total':
mothers = nuVeto.categ_to_mothers(
'conv', daughter) + nuVeto.categ_to_mothers('pr', daughter)
else:
mothers = [
categ,
]
return mothers
@staticmethod
def esamp(enu, accuracy):
""" returns the sampling of parent energies for a given enu
"""
# TODO: replace 1e8 with MMC-prpl interpolated bounds
return np.logspace(np.log10(enu), np.log10(enu + 1e8),
int(1000 * accuracy))
@staticmethod
def projectiles():
"""Get allowed pimaries"""
pdg_ids = config.adv_set['allowed_projectiles']
namer = ParticleProperties.modtab.pdg2modname
allowed = []
for pdg_id in pdg_ids:
allowed.append(namer[pdg_id])
try:
allowed.append(namer[-pdg_id])
except KeyError:
continue
return allowed
@staticmethod
def nbody(fpath, esamp, enu, fn, l_ice):
with np.load(fpath) as dfile:
xmus = centers(dfile['xedges'])
xnus = np.concatenate([xmus, [1]])
vals = np.nan_to_num(dfile['histograms'])
ddec = interpolate.RegularGridInterpolator((xnus, xmus),
vals,
bounds_error=False,
fill_value=None)
emu_mat = xmus[:, None] * esamp[None, :] * Units.GeV
pmu_mat = ddec(np.stack(np.meshgrid(enu / esamp, xmus), axis=-1))
reaching = 1 - np.sum(pmu_mat * fn.prpl(
np.stack([emu_mat, np.ones(emu_mat.shape) * l_ice], axis=-1)),
axis=0)
reaching[reaching < 0.] = 0.
return reaching
@staticmethod
@lru_cache(2**12)
def psib(l_ice, mother, enu, accuracy, prpl):
""" returns the suppression factor due to the sibling muon
"""
esamp = nuVeto.esamp(enu, accuracy)
fn = MuonProb(prpl)
if mother in ['D0', 'D0-bar']:
reaching = nuVeto.nbody(
resource_filename('nuVeto',
'data/decay_distributions/D0_numu.npz'),
esamp, enu, fn, l_ice)
elif mother in ['D+', 'D-']:
reaching = nuVeto.nbody(
resource_filename('nuVeto',
'data/decay_distributions/D+_numu.npz'),
esamp, enu, fn, l_ice)
elif mother in ['Ds+', 'Ds-']:
reaching = nuVeto.nbody(
resource_filename('nuVeto',
'data/decay_distributions/Ds_numu.npz'),
esamp, enu, fn, l_ice)
elif mother == 'K0L':
reaching = nuVeto.nbody(
resource_filename('nuVeto',
'data/decay_distributions/K0L_numu.npz'),
esamp, enu, fn, l_ice)
else:
# Assuming muon energy is E_parent - E_nu
reaching = 1. - fn.prpl(
list(zip((esamp - enu) * Units.GeV, [l_ice] * len(esamp))))
return reaching
@lru_cache(maxsize=2**12)
def get_dNdEE(self, mother, daughter):
"""Differential parent-->neutrino (mother--daughter) yield"""
ihijo = 20
e_grid = self.mceq.e_grid
delta = self.mceq.e_widths
x_range = e_grid[ihijo] / e_grid
rr = ParticleProperties.rr(mother, daughter)
dNdEE_edge = ParticleProperties.br_2body(mother, daughter) / (1 - rr)
dN_mat = self.mceq._decays.get_matrix(
(ParticleProperties.pdg_id[mother], 0),
(ParticleProperties.pdg_id[daughter], 0))
dNdEE = dN_mat[ihijo] * e_grid / delta
logx = np.log10(x_range)
logx_width = -np.diff(logx)[0]
good = (logx + logx_width / 2 < np.log10(1 - rr)) & (x_range >= 5.e-2)
x_low = x_range[x_range < 5e-2]
dNdEE_low = np.array([dNdEE[good][-1]] * x_low.size)
dNdEE_interp = lambda x_: interpolate.pchip(
np.concatenate([[1 - rr], x_range[good], x_low])[::-1],
np.concatenate([[dNdEE_edge], dNdEE[good], dNdEE_low])[::-1],
extrapolate=True)(x_) * np.heaviside(1 - rr - x_, 1)
return x_range, dNdEE, dNdEE_interp
@lru_cache(maxsize=2**12)
def grid_sol(self, ecr=None, particle=None):
"""MCEq grid solution for \\frac{dN_{CR,p}}_{dE_p}"""
if ecr is not None:
self.mceq.set_single_primary_particle(ecr, particle)
else:
self.mceq.set_primary_model(*self.pmodel)
self.mceq.solve(int_grid=self.X_vec, grid_var="X")
return self.mceq.grid_sol
@lru_cache(maxsize=2**12)
def nmu(self, ecr, particle, prpl='ice_allm97_step_1'):
"""Poisson probability of getting no muons"""
grid_sol = self.grid_sol(ecr, particle)
l_ice = self.geom.overburden(self.costh)
mu = np.abs(self.get_solution('mu-', grid_sol)) + np.abs(
self.get_solution(
'mu+', grid_sol)) # np.abs hack to prevent negative fluxes
fn = MuonProb(prpl)
coords = list(
zip(self.mceq.e_grid * Units.GeV, [l_ice] * len(self.mceq.e_grid)))
### DEBUG ###
# if np.trapz(mu*fn.prpl(coords)*self.mceq.e_grid, np.log(self.mceq.e_grid)) < 0:
# import pdb
# pdb.set_trace()
###
return np.trapz(mu * fn.prpl(coords) * self.mceq.e_grid,
np.log(self.mceq.e_grid))
@lru_cache(maxsize=2**12)
def get_rescale_phi(self, mother, ecr=None, particle=None):
"""Flux of the mother at all heights"""
grid_sol = self.grid_sol(
ecr, particle
) # MCEq solution (fluxes tabulated as a function of height)
dX = self.dX_vec * Units.gr / Units.cm**2
rho = self.mceq.density_model.X2rho(
self.X_vec) * Units.gr / Units.cm**3
inv_decay_length_array = (
ParticleProperties.mass_dict[mother] /
(self.mceq.e_grid[:, None] * Units.GeV)) / (
ParticleProperties.lifetime_dict[mother] * rho[None, :])
rescale_phi = dX[None, :] * inv_decay_length_array * self.get_solution(
mother, grid_sol, grid_idx=False).T
return rescale_phi
def get_integrand(self,
categ,
daughter,
enu,
accuracy,
prpl,
ecr=None,
particle=None):
"""flux*yield"""
esamp = self.esamp(enu, accuracy)
mothers = self.categ_to_mothers(categ, daughter)
nums = np.zeros((len(esamp), len(self.X_vec)))
dens = np.zeros((len(esamp), len(self.X_vec)))
for mother in mothers:
dNdEE = self.get_dNdEE(mother, daughter)[-1]
rescale_phi = self.get_rescale_phi(mother, ecr, particle)
# DEBUG
# from matplotlib import pyplot as plt
# plt.plot(np.log(self.mceq.e_grid[rescale_phi[:,0]>0]),
# np.log(rescale_phi[:,0][rescale_phi[:,0]>0]))
# rescale_phi = np.array([interpolate.interp1d(self.mceq.e_grid, rescale_phi[:,i], kind='quadratic', bounds_error=False, fill_value=0)(esamp) for i in range(rescale_phi.shape[1])]).T
###
# TODO: optimize to only run when esamp[0] is non-zero
rescale_phi = np.exp(
np.array([
interpolate.interp1d(
np.log(self.mceq.e_grid[rescale_phi[:, i] > 0]),
np.log(rescale_phi[:, i][rescale_phi[:, i] > 0]),
kind='quadratic',
bounds_error=False,
fill_value=-np.inf)(np.log(esamp))
if np.count_nonzero(rescale_phi[:, i] > 0) > 2 else [
-np.inf,
] * esamp.shape[0] for i in range(rescale_phi.shape[1])
])).T
# DEBUG
# print rescale_phi.min(), rescale_phi.max()
# print np.log(esamp)
# plt.plot(np.log(esamp),
# np.log(rescale_phi[:,0]), label='intp')
# plt.legend()
# import pdb
# pdb.set_trace()
###
if 'nu_mu' in daughter:
# muon accompanies nu_mu only
pnmsib = self.psib(self.geom.overburden(self.costh), mother,
enu, accuracy, prpl)
else:
pnmsib = np.ones(len(esamp))
dnde = dNdEE(enu / esamp) / esamp
nums += (dnde * pnmsib)[:, None] * rescale_phi
dens += (dnde)[:, None] * rescale_phi
return nums, dens
def get_solution(self, particle_name, grid_sol, mag=0., grid_idx=None):
"""Retrieves solution of the calculation on the energy grid.
Args:
particle_name (str): The name of the particle such, e.g.
``total_mu+`` for the total flux spectrum of positive muons or
``pr_antinumu`` for the flux spectrum of prompt anti muon neutrinos
mag (float, optional): 'magnification factor': the solution is
multiplied by ``sol`` :math:`= \\Phi \\cdot E^{mag}`
grid_idx (int, optional): if the integrator has been configured to save
intermediate solutions on a depth grid, then ``grid_idx`` specifies
the index of the depth grid for which the solution is retrieved. If
not specified the flux at the surface is returned
integrate (bool, optional): return averge particle number instead of
flux (multiply by bin width)
Returns:
(numpy.array): flux of particles on energy grid :attr:`e_grid`
"""
# MCEq index conversion
ref = self.mceq.pman.pname2pref
p_pdg = ParticleProperties.pdg_id[particle_name]
reduce_res = True
if grid_idx is None: # Surface only case
sol = np.array([grid_sol[-1]])
xv = np.array([self.X_vec[-1]])
elif isinstance(grid_idx,
bool) and not grid_idx: # Whole solution case
sol = np.asarray(grid_sol)
xv = np.asarray(self.X_vec)
reduce_res = False
elif grid_idx >= len(self.mceq.grid_sol): # Surface only case
sol = np.array([grid_sol[-1]])
xv = np.array([self.X_vec[-1]])
else: # Particular height case
sol = np.array([grid_sol[grid_idx]])
xv = np.array([self.X_vec[grid_idx]])
# MCEq solution for particle
direct = sol[:, ref[particle_name].lidx:ref[particle_name].uidx]
res = np.zeros(direct.shape)
rho_air = 1. / self.mceq.density_model.r_X2rho(xv)
# meson decay length
decayl = ((self.mceq.e_grid * Units.GeV) /
ParticleProperties.mass_dict[particle_name] *
ParticleProperties.lifetime_dict[particle_name] / Units.cm)
# number of targets per cm2
ndens = rho_air * Units.Na / Units.mol_air
sec = self.mceq.pman[p_pdg]
prim2mceq = {
'p+-bar': 'pbar-',
'n0-bar': 'nbar0',
'D0-bar': 'Dbar0',
'Lambda0-bar': 'Lambdabar0'
}
for prim in self.projectiles():
if prim in prim2mceq:
_ = prim2mceq[prim]
else:
_ = prim
prim_flux = sol[:, ref[_].lidx:ref[_].uidx]
proj = self.mceq.pman[ParticleProperties.pdg_id[prim]]
prim_xs = proj.inel_cross_section()
try:
int_yields = proj.hadr_yields[sec]
res += np.sum(int_yields[None, :, :] * prim_flux[:, None, :] *
prim_xs[None, None, :] * ndens[:, None, None],
axis=2)
except KeyError as e:
continue
res *= decayl[None, :]
# combine with direct
res[direct != 0] = direct[direct != 0]
if particle_name[:-1] == 'mu':
for _ in ['k_' + particle_name, 'pi_' + particle_name]:
res += sol[:, ref[_ + '_l'].lidx:ref[_ + '_l'].uidx]
res += sol[:, ref[_ + '_r'].lidx:ref[_ + '_r'].uidx]
res *= self.mceq.e_grid[None, :]**mag
if reduce_res:
res = res[0]
return res
def get_fluxes(self,
enu,
kind='conv nu_mu',
accuracy=3.5,
prpl='ice_allm97_step_1',
corr_only=False):
"""Returns the flux and passing fraction
for a particular neutrino energy, flux, and p_light
"""
# prpl = probability of reaching * probability of light
# prpl -> None ==> median for muon reaching
categ, daughter = kind.split()
esamp = self.esamp(enu, accuracy)
# Correlated only (no need for the unified calculation here) [really just for testing]
passed = 0
total = 0
if corr_only:
# sum performs the dX integral
nums, dens = self.get_integrand(categ, daughter, enu, accuracy,
prpl)
num = np.sum(nums, axis=1)
den = np.sum(dens, axis=1)
passed = integrate.trapz(num, esamp)
total = integrate.trapz(den, esamp)
return passed, total
pmodel = self.pmodel[0](self.pmodel[1])
#loop over primary particles
for particle in pmodel.nucleus_ids:
# A continuous input energy range is allowed between
# :math:`50*A~ \\text{GeV} < E_\\text{nucleus} < 10^{10}*A \\text{GeV}`.
# ecrs --> Energy of cosmic ray primaries
# amu --> atomic mass of primary
# evaluation points in E_CR
ecrs = amu(particle) * np.logspace(2, 10, int(10 * accuracy))
# pnm --> probability of no muon (just a poisson probability)
nmu = [self.nmu(ecr, particle, prpl) for ecr in ecrs]
# nmufn --> fine grid interpolation of pnm
nmufn = interpolate.interp1d(ecrs,
nmu,
kind='linear',
assume_sorted=True,
bounds_error=False,
fill_value=(0, np.nan))
# nums --> numerator
nums = []
# dens --> denominator
dens = []
# istart --> integration starting point, the lowest energy index for the integral
istart = max(0, np.argmax(ecrs > enu) - 1)
for ecr in ecrs[istart:]: # integral in primary energy (E_CR)
# cr_flux --> cosmic ray flux
# phim2 --> units of flux * m^2 (look it up in the units)
cr_flux = pmodel.nucleus_flux(particle,
ecr.item()) * Units.phim2
# poisson exp(-Nmu) [last term in eq 12]
pnmarr = np.exp(-nmufn(ecr - esamp))
num_ecr = 0 # single entry in nums
den_ecr = 0 # single entry in dens
# dEp
# integral in Ep
nums_ecr, dens_ecr = self.get_integrand(
categ, daughter, enu, accuracy, prpl, ecr, particle)
num_ecr = integrate.trapz(
np.sum(nums_ecr, axis=1) * pnmarr, esamp)
den_ecr = integrate.trapz(np.sum(dens_ecr, axis=1), esamp)
nums.append(num_ecr * cr_flux / Units.phicm2)
dens.append(den_ecr * cr_flux / Units.phicm2)
# dEcr
passed += integrate.trapz(nums, ecrs[istart:])
total += integrate.trapz(dens, ecrs[istart:])
return passed, total
def generate_table(interaction_model=None,
primary_model=None,
density_model=None):
interaction_model = interaction_model or 'SIBYLL23C'
primary_model = primary_model or 'H3a'
density_model = density_model or 'USStd'
tag = '-'.join((interaction_model.lower(), primary_model.lower(),
density_model.lower()))
weights = None
if interaction_model == 'YFM':
# Use weights from Yanez et al., 2019 (https://arxiv.org/abs/1909.08365)
interaction_model = 'SIBYLL23C'
weights = {211: 0.141, -211: 0.116, 321: 0.402, -321: 0.583}
if primary_model == 'GSF':
primary_model = (crf.GlobalSplineFitBeta, None)
elif primary_model == 'H3a':
primary_model = (crf.HillasGaisser2012, 'H3a')
elif primary_model == 'PolyGonato':
primary_model = (crf.PolyGonato, None)
else:
raise ValueError(f'Invalid primary model: {primary_model}')
if density_model == 'USStd':
density_model = ('CORSIKA', ('USStd', None))
elif density_model.startswith('MSIS00'):
density_model = ('MSIS00', density_model.split('-')[1:])
else:
raise ValueError(f'Invalid density model: {density_model}')
config.e_min = 1E-01
config.enable_default_tracking = False
config.enable_muon_energy_loss = True
mceq = MCEqRun(interaction_model=interaction_model,
primary_model=primary_model,
density_model=density_model,
theta_deg=0)
if weights:
def weight(xmat, egrid, name, c):
return (1 + c) * numpy.ones_like(xmat)
for pid, w in weights.items():
mceq.set_mod_pprod(2212, pid, weight, ('a', w))
mceq.regenerate_matrices(skip_decay_matrix=True)
energy = mceq.e_grid
cos_theta = numpy.linspace(0, 1, 51)
altitude = numpy.linspace(0, 9E+03, 10)
data = numpy.zeros((altitude.size, cos_theta.size, energy.size, 2))
for ic, ci in enumerate(cos_theta):
print(f'processing {ci:.2f}')
theta = numpy.arccos(ci) * 180 / numpy.pi
mceq.set_theta_deg(theta)
X_grid = mceq.density_model.h2X(altitude[::-1] * 1E+02)
mceq.solve(int_grid=X_grid)
for index, _ in enumerate(altitude):
mu_m = mceq.get_solution('mu-', grid_idx=index) * 1E+04
mu_p = mceq.get_solution('mu+', grid_idx=index) * 1E+04
K = (mu_m > 0) & (mu_p > 0)
data[altitude.size - 1 - index, ic, K, 0] = mu_m[K]
data[altitude.size - 1 - index, ic, K, 1] = mu_p[K]
# Dump the data grid to a litle endian binary file
data = data.astype('f4').flatten()
with open(f'data/simulated/flux-mceq-{tag}.table', 'wb') as f:
numpy.array((energy.size, cos_theta.size, altitude.size),
dtype='i8').astype('<i8').tofile(f)
numpy.array((energy[0], energy[-1], cos_theta[0], cos_theta[-1],
altitude[0], altitude[-1]),
dtype='f8').astype('<f8').tofile(f)
data.astype('<f4').tofile(f)
