def calculateTimeSteppingCoeffs(self, s):
Inv_c = s["cosmogenic inventory"]
# initialize (first time step) or read in coefficients
if s["age"] == self.timestep:
s["psi_spallation_coeff"] = 0.0
s["slowMuonContrib"] = 0.0
s["fastMuonContrib"] = 0.0
# Initial RHS_1 == Inv_c (or Inv_m - Inv_r)
s["RHS_1"] = Inv_c
# Set the decay time for the current nuclide
self.LAMBDA_36 = Nuclide.decay[self.experiment['nuclide']]
exp1 = math.exp(-(self.LAMBDA_36) * s["age"])
#Stable isotopes have no exponential decreasing effect
if Nuclide.stable(self.experiment['nuclide']):
exp1 = 1.0
mul0 = -1.0 * self.LAMBDA_36 * self.timestep
min0 = 1.0 - math.exp(mul0)
#Stable isotopes have no exponential decreasing effect
if Nuclide.stable(self.experiment['nuclide']):
div1 = self.timestep
mul1 = self.S_el * self.timestep * exp1
else:
div1 = min0 / self.LAMBDA_36
mul1 = self.S_el * div1 * exp1
mul2 = self.shielding_factor * self.Q_s
s["psi_spallation_coeff"] += mul1 * mul2
s["slowMuonContrib"] += self.S_mu * div1 * exp1 * self.Q_mu * self.Pmu_slow * self.shielding_factor
s["fastMuonContrib"] += self.S_mu * div1 * exp1 * self.Q_mu * self.Pmu_fast * self.shielding_factor
# Calculate RHS below. Note that this is really
# RHS = InvC - muonContrib
# As it appears in the time averaing procedure (OutputFor36clCalibration)
# but from time step to time step it takes away the individual contribution from
# that time step
# print s["RHS_1"]
# print self.Pmu_0
s["RHS_1"] -= self.S_mu * div1 * exp1 * self.Q_mu * self.Pmu_slow * self.shielding_factor
s["RHS_1"] -= self.S_mu_fast * div1 * exp1 * self.Q_mu * self.Pmu_fast * self.shielding_factor
def calculate_age(self, s):
#print
#print "Entering calculate_age"
#print " age : " + str(s["age"])
#print " Inv_c_mod: " + str(s["Inv_c_mod"])
#print
# calculate how much the inventory has changed over the timestep
# also wind the age back timestep years (10)
# Set the decay time for the current nuclide
self.LAMBDA_36 = Nuclide.decay[self.experiment['nuclide']]
prod0 = -1.0 * self.LAMBDA_36 * self.timestep
minu0 = 1.0 - math.exp(prod0)
#Stable isotopes have no exponential decreasing effect
if Nuclide.stable(self.experiment['nuclide']):
divi1 = self.timestep
else:
divi1 = minu0 / self.LAMBDA_36
prod1 = s["P_total"] * divi1
#prod1 = s["P_total"] * self.timestep
prod2 = -1.0 * self.LAMBDA_36 * s["age"]
prod3 = math.exp(prod2)
prod4 = prod3 * prod1
#Stable isotopes have no exponential decreasing effect
if Nuclide.stable(self.experiment['nuclide']):
prod4 = prod1
s["Inv_c_mod"] -= prod4
prod5 = s["P_total_uncertainty"] * self.timestep
prod6 = prod3 * prod5
#Stable isotopes have no exponential decreasing effect
if Nuclide.stable(self.experiment['nuclide']):
prod6 = prod5
s["Inv_c_uncertainty"] += prod6
def calculatePinv(self, s):
self.LAMBDA_36 = Nuclide.decay[self.experiment["nuclide"]]
# calculate time invariant production rate
prod0 = -1.0 * self.LAMBDA_36 * s["age"]
denom = 1.0 - math.exp(prod0)
num = s["cosmogenic inventory"] * self.LAMBDA_36
# Stable isotopes have no exponential decreasing effect
if Nuclide.stable(self.experiment["nuclide"]):
num = s["cosmogenic inventory"]
denom = s["age"]
s["production rate invariant"] = num / denom
