public Neutron(CustomPoint3D startPoint, double sigmaA, double sigmaTr)
{
this._sigmaA = sigmaA;
this._sigmaTr = sigmaTr;
this.AverageFreePathLength = 0;
this.isAbsorbed = false;
this.FreePathLength = new List<double>() { 0 };
this.GuidedCos = new List<Vector3D>() { new Vector3D() };
this.CollisionPoint = new List<CustomPoint3D>() { startPoint };
}
public Neutron(CustomPoint3D startPoint, double sigmaA, double sigmaS, double sigmaTr, double sigmaT)
{
_sigmaA = sigmaA;
_sigmaS = sigmaS;
_sigmaTr = sigmaTr;
_sigmaT = sigmaT;
AverageFreePathLength = 0;
IsAbsorbed = false;
FreePathLength = new List<double>() { 0 };
GuidedCos = new List<Vector3D>() { new Vector3D() };
CollisionPoint = new List<CustomPoint3D>() { startPoint };
}
private void SubStep(int step, CustomPoint3D startPoint)
{
var gamma1 = Rnd(double.Epsilon, 1);
FreePathLength.Add(-Math.Log(gamma1) / _sigmaS);
var gamma2x = Rnd(0, 1);
var gamma2y = Rnd(0, 1);
//var gamma2z = Rnd(0, 1);
//var wz = 1 - 2 * gamma2z;
//var tmp2 = Math.Sqrt(1 - Math.Pow(cosZ, 2));
//var wx = tmp2 * Math.Cos(TwoPi * gamma2x);
//var vy = tmp2 * Math.Sin(TwoPi * gamma2y);
var wx = Math.Cos(TwoPi * gamma2x);
var wy = Math.Sin(TwoPi * gamma2y);
var wz = 0;
GuidedCos.Add(new Vector3D(wx, wy, wz));
CollisionPoint.Add(new CustomPoint3D(
startPoint.X + GuidedCos[step].X * FreePathLength[step],
startPoint.Y + GuidedCos[step].Y * FreePathLength[step],
startPoint.Z + GuidedCos[step].Z * FreePathLength[step]));
PathLength += FreePathLength[step];
var gamma3 = Rnd(0, 1);
if (gamma3 <= _sigmaA/_sigmaT)
IsAbsorbed = true;
//Console.WriteLine(@"FreePathLength: {0}; wx: {1}; wy: {2};wz: {3}; gamma3: {4}; SigmaA: {5}; SigmaTr: {6}; {7}", FreePathLength[step], wx, wy, wz, gamma3, _sigmaA, _sigmaTr, _sigmaA/_sigmaTr);
}
private void SubStep(int step, double gamma, CustomPoint3D startPoint)
{
FreePathLength.Add(-Math.Log(gamma) / _sigmaTr);
var cosZ = 1 - 2 * gamma;
var tmp2 = Math.Sqrt(1 - Math.Pow(cosZ, 2));
GuidedCos.Add(new Vector3D(tmp2 * Math.Cos(TWO_PI * gamma), tmp2 * Math.Sin(TWO_PI * gamma), cosZ));
CollisionPoint.Add(new CustomPoint3D(
startPoint.X + GuidedCos[step].X * FreePathLength[step],
startPoint.Y + GuidedCos[step].Y * FreePathLength[step],
startPoint.Z + GuidedCos[step].Z * FreePathLength[step]));
AverageFreePathLength = CustomPoint3D.DistanceBetween(CollisionPoint[step], CollisionPoint[step - 1]);
if (Rnd(0, 1) <= _sigmaA/_sigmaTr)
this.isAbsorbed = true;
}