Exemplo n.º 1
0
void PIC::Boris_uxy(Grid2D& Bx, Grid2D& By, double dt)
{
 long j;	
 double tx, ty, tabs2, Bxj, Byj, Babs, u2, gamma, ux0, uy0, uz0;	
 for(j=0; j<part.size(); j++)
   { 
    Bxj=Bx.Grid2PIC(part[j].x,part[j].y);
	Byj=By.Grid2PIC(part[j].x,part[j].y); 
	Babs=sqrt(pow(Bxj,2)+pow(Byj,2));
	u2=pow(part[j].uy,2)+pow(part[j].ux,2)+pow(part[j].uz,2);
	gamma=sqrt(1.0+u2/pow(clight,2));
	ux0=part[j].ux;uy0=part[j].uy;uz0=part[j].uz;
	if (Babs > 0.0) {
		tx=Bxj/Babs*tan(charge_p*dt*Babs/(2.0*gamma*mass_p));
		ty=Byj/Babs*tan(charge_p*dt*Babs/(2.0*gamma*mass_p)); }
	else {tx=0.0; ty=0.0;}
	
	tabs2=pow(tx,2)+pow(ty,2); 
	
	part[j].ux+=-part[j].uz*ty;
	part[j].uy+=part[j].uz*tx;
    part[j].uz+=part[j].ux*ty-part[j].uy*tx;
	
	part[j].ux=ux0-part[j].uz*ty*2.0/(1.0+tabs2);
	part[j].uy=uy0+part[j].uz*tx*2.0/(1.0+tabs2);
    part[j].uz=uz0+part[j].ux*ty*2.0/(1.0+tabs2)-part[j].uy*tx*2.0/(1.0+tabs2);
   }
}
Exemplo n.º 2
0
void Pic::kick(Grid2D& Ex, Grid2D& Ey, double ds){
  double beta0 = SP->beta0, gamma0 = SP->gamma0, A = SP->A, Z = SP->Z;
  double temp = qe*Z/(mp*A*pow(gamma0, 3)*pow(beta0*clight, 2))*ds;
  double ex, ey;

  for(long j=0; j < pics.size(); ++j){
    ex = temp*Ex.Grid2PIC(pics[j].x, pics[j].y);
    ey = temp*Ey.Grid2PIC(pics[j].x, pics[j].y);

  //momenta:

    pics[j].xs += ex;
    pics[j].ys += ey;
  }
}
Exemplo n.º 3
0
double PIC::total_energy(Grid2D& pot)
{
	long j, n=part.size();
	double ekin=total_kinetic_energy();	
	double epot=0.0;
	for(j=0; j<n; j++)
		  epot+=macroN*pot.Grid2PIC(part[j].x,part[j].y);
	return ekin+epot;
}