void Propagation::Propagate(Particle &curr_particle,
std::vector<Particle> &ParticleAtMatrix,
std::vector<Particle> &ParticleAtGround,
bool dropParticlesBelowEnergyThreshold
) const {
double theta_deflBF = 0.0;
double BNorm = magneticFieldStrength;
double zin = curr_particle.Getz();
double Ein = curr_particle.GetEnergy();
int type = curr_particle.GetType();
int wi_last = curr_particle.GetWeigth();
double z_curr = zin;
double Ecurr = Ein;
bool interacted = 0;
double min_dist = 1e12;
double walkdone = 0;
double E1 = 0;
double E2 = 0;
double E3 = 0;
double stepsize = 0;
double Elast = 0;
double R = Uniform(0.0, 1.0);
double R2 = Uniform(0.0, 1.0);
Process proc;
proc.SetIncidentParticle(curr_particle);
proc.SetBackground(Bkg);
double Ethr2 = std::max(fEthr, std::max(ElectronMass,ElectronMass*ElectronMass/proc.feps_sup));
if (Ecurr < Ethr2)
{
if (!dropParticlesBelowEnergyThreshold)
ParticleAtGround.push_back(curr_particle);
return;
}
std::vector<double> EtargetAll = GetEtarget(proc, curr_particle);
min_dist = ExtractMinDist(proc, curr_particle.GetType(), R, R2, EtargetAll);
interacted = 0;
double dz = 0;
double zpos = zin;
double corrB_factor = 0;
double realpath = 0;
double min_dist_last = min_dist;
while (!interacted) {
proc.SetInteractionAngle(cPI);
theta_deflBF = 0;
realpath = 0.1 * min_dist;
theta_deflBF = GetMeanThetaBFDeflection(BNorm,
curr_particle.GetEnergy(), curr_particle.GetType(), min_dist);
corrB_factor = cos(theta_deflBF);
stepsize = realpath * corrB_factor;
dz = Mpc2z(stepsize);
if ((walkdone + realpath) > min_dist) {
interacted = 1;
}
if (zpos - dz <= 0) {
dz = zpos;
stepsize = z2Mpc(dz);
realpath = stepsize / corrB_factor;
}
zpos -= dz;
walkdone += realpath;
Elast = Ecurr;
if (type == 0 || type == 22)
Ecurr = EnergyLoss1D(Ecurr, zpos + Mpc2z(realpath), zpos, 0);
else
Ecurr = EnergyLoss1D(Ecurr, zpos + Mpc2z(realpath), zpos, BNorm);
z_curr = zpos;
curr_particle.Setz(z_curr);
curr_particle.SetEnergy(Ecurr);
if (z_curr <= 0)
{
ParticleAtGround.push_back(curr_particle);
return;
}
if (Ecurr <= Ethr2)
{
if (!dropParticlesBelowEnergyThreshold)
{
ParticleAtGround.push_back(curr_particle);
}
return;
}
proc.SetIncidentParticle(curr_particle);
proc.SetCMEnergy();
proc.SetLimits();
// std::vector<double> EtargetAll=GetEtarget(proc,curr_particle);
min_dist = ExtractMinDist(proc, curr_particle.GetType(), R, R2,
EtargetAll);
} //end while
if (interacted == 1) {
if (proc.GetName() == Process::PP) {
E1 = ExtractPPSecondariesEnergy(proc);
if (E1 == 0 || E1 == Ecurr)
std::cerr << "ERROR in PP process: E : " << Ecurr << " " << E1
<< " " << std::endl;
Particle pp(11, E1, z_curr,curr_particle.Generation()+1);
pp.SetWeigth(wi_last);
ParticleAtMatrix.push_back(pp);
Particle pe(-11, Ecurr - E1, z_curr,curr_particle.Generation()+1);
pe.SetWeigth(wi_last);
ParticleAtMatrix.push_back(pe);
return;
} //if PP
else if (proc.GetName() == Process::DPP) {
E1 = (Ecurr - 2 * ElectronMass) / 2.0;
if (E1 == 0)
std::cerr << "ERROR in DPP process E : " << E1 << std::endl;
Particle pp(11, E1, z_curr,curr_particle.Generation()+1);
pp.SetWeigth(wi_last);
ParticleAtMatrix.push_back(pp);
Particle pe(-11, E1, z_curr,curr_particle.Generation()+1);
pe.SetWeigth(wi_last);
ParticleAtMatrix.push_back(pe);
return;
} //end if DPP
else if (proc.GetName() == Process::ICS) {
E1 = ExtractICSSecondariesEnergy(proc);
E2 = Ecurr - E1;
if (E1 == 0 || E2 == 0)
std::cerr << "ERROR in ICS process E : " << E1 << " " << E2
<< std::endl;
Particle pp(curr_particle.GetType(), E1, z_curr,curr_particle.Generation()+1);
pp.SetWeigth(wi_last);
ParticleAtMatrix.push_back(pp);
Particle pg(22, E2, z_curr,curr_particle.Generation()+1);
pg.SetWeigth(wi_last);
ParticleAtMatrix.push_back(pg);
return;
} //end if ics
else if (proc.GetName() == Process::TPP) {
E1 = E2 = ExtractTPPSecondariesEnergy(proc);
E3 = Ecurr - E1 - E2;
if (E1 == 0 || E2 == 0 || E3 == 0)
std::cerr << "ERROR in TPP process E : " << E1 << " " << E2
<< std::endl;
Particle pp(11, E1, z_curr,curr_particle.Generation()+1);
pp.SetWeigth(wi_last);
ParticleAtMatrix.push_back(pp);
Particle pe(-11, E1, z_curr,curr_particle.Generation()+1);
pe.SetWeigth(wi_last);
ParticleAtMatrix.push_back(pe);
Particle psc(curr_particle.GetType(), E3, z_curr,curr_particle.Generation()+1);
psc.SetWeigth(wi_last);
ParticleAtMatrix.push_back(psc);
return;
}
}
return;
}
std::vector<double> Propagation::GetEtarget(Process &proc,
const Particle &particle) const {
std::vector<double> Etarget;
double Etarget_tmp = 0;
double smintmp = 0;
double z_curr = particle.Getz();
double Energy = particle.GetEnergy();
int pType = particle.GetType();
double Eexp = smintmp/(4.0 * Energy);
if (pType == 22) {
proc.SetName(Process::PP);
proc.SetLimits();
smintmp = proc.GetMin();
Eexp = std::max(proc.feps_inf,ElectronMass*ElectronMass/Energy);
if (Eexp > proc.feps_sup) {
// std::cout << proc.GetName() << " " << Eexp << " too big wrt " << proc.feps_sup << " , " << proc.feps_inf << " .. it should not interact!" << std::endl;
Eexp = 0;
Etarget.push_back(0);}
else
Etarget_tmp = ShootPhotonEnergyMC(Eexp, z_curr);
Etarget.push_back(Etarget_tmp);
proc.SetName(Process::DPP);
proc.SetLimits();
smintmp = proc.GetMin();
Eexp = std::max(proc.feps_inf,2*ElectronMass*ElectronMass/Energy);
if (Eexp > proc.feps_sup) {
// std::cout << proc.GetName() << " " << Eexp << " too big wrt " << proc.feps_sup << " , " << proc.feps_inf << " .. it should not interact!" << std::endl;
Eexp = 0;
Etarget.push_back(0);}
else
Etarget_tmp = ShootPhotonEnergyMC(Eexp, z_curr);
Etarget.push_back(Etarget_tmp);
}
else if (abs(pType) == 11) {
proc.SetName(Process::ICS);
proc.SetLimits();
smintmp = proc.GetMin();
Eexp = proc.feps_inf;
Etarget_tmp = ShootPhotonEnergyMC(Eexp, z_curr);
Etarget.push_back(Etarget_tmp);
proc.SetName(Process::TPP);
proc.SetLimits();
smintmp = proc.GetMin();
Eexp = std::max(proc.feps_inf,2*ElectronMass*ElectronMass/Energy);
if (Eexp > proc.feps_sup) {
// std::cout << proc.GetName() << " " << Eexp << " too big wrt " << proc.feps_sup << " , " << proc.feps_inf << " .. it should not interact!" << std::endl;
Eexp = 0;
Etarget.push_back(0);}
else
Etarget_tmp = ShootPhotonEnergyMC(Eexp, z_curr);
Etarget.push_back(Etarget_tmp);
} //end e/e
else
std::cerr << "something wrong in particle type ( " << pType
<< ". Propagation of photons and e+/e- is the only allowed.)"
<< std::endl;
if (Etarget.size() != 2) {
std::cout << "something wrong with the Etarget!! " << std::endl;
exit(0);
}
return Etarget;
}