//Original Boost
inline bool Vec4D::Boost( const Vec3D& boost )
{
VEC3D_T s=boost.Norm();
if( s >= (VEC3D_T)1. ) {
return false; // boost is invalid
}
Vec3D e_boost;
VEC3D_T gamma=1./sqrt(1.-(boost*boost));
if( s != (VEC3D_T)0 ) {
e_boost=boost/s;
}
else {
return true; // no boost required, boost=0..
}
VEC3D_T par=(r*e_boost);
Vec4D t(gamma*(r0-(boost*r)),
gamma*(par*e_boost-r0*boost)+r-par*e_boost);
*this=t;
if(gamma >=1.0E+6) {
std::cout <<"Boost: Boost accuracy may be lost " << std::endl;
std::cout <<" Boost is too large > 1E+6 " << std::endl;
}
return true;
}
/** Overloaded class constructor. Construct a particle with
specified 4-position, 3-velocity direction, energy,
rest mass and charge
\param _r: 4-position: (c*t, x, y, z) [cm]
\param v: direction of velocity [unitless]
\param E: energy [erg]
\param data: PDG data for particle
*/
inline Particle::Particle(const Vec4D& _r, const Vec3D& v_hat, double E,
const PDGData* data):
r(_r), p(E,v_hat*(sqrt(E*E-data->mass*data->mass)/v_hat.Norm())),
m2c4(data->mass*data->mass), charge(double(data->charge))
{
// nothing to see here
}
/** Overloaded class constructor. Construct a particle with
specified 4-position, 3-velocity direction, energy,
rest mass and charge
\param _r: 4-position: (c*t, x, y, z) [cm]
\param v: direction of velocity [unitless]
\param E: energy [erg]
\param mc2: rest mass [erg]
\param q: charge in units of electron charge [e]
*/
inline Particle::Particle(const Vec4D& _r, const Vec3D& v_hat, double E,
double mc2, double q):
r(_r), p(E,v_hat*(sqrt(E*E-mc2*mc2)/v_hat.Norm())),
m2c4(mc2*mc2), charge(q)
{
// nothing to see here
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/// Method to return a normalized direction vector
inline Vec3D Vec4D::GetDirection()
{
if(r.Norm2()==0.)
{
return r;
}
else
{
VEC3D_T norm = r.Norm();
Vec3D r1 = r/norm;
return r1;
}
}
//new Vec4D that takes Vec4D
//note no further computation of gamma is required
inline bool Vec4D::Boost4D( const Vec4D& boost4D )
{
/*Here we begin by taking Vec4D and extracting
beta-gamma boost vector parameter as Vec3D
boost after dividing by gamma and last
coordinate as scalar gamma*/
//VEC3D_T _n = Norm2();
VEC3D_T gamma = boost4D.r0;
Vec3D boost = (boost4D.r)/gamma;
VEC3D_T s = boost.Norm();
if(s > (VEC3D_T) 1) {
return false;
}
Vec3D e_boost;
if( s != (VEC3D_T)0 ) {
e_boost=boost/s;
}
else {
return true; // no boost required, boost=0..
}
//change the boosting specifics by factoring to preserve precision
VEC3D_T par=(r*e_boost);
Vec4D t(gamma*r0-(boost4D.r)*r,
r - par*e_boost + gamma*(par*e_boost) - (boost4D.r)*r0);
/*VEC3D_T _n2 = t.Norm2();
std::cout << _n2;
if(_n>_n2)
{
t.r0+=sqrt(_n-_n2);
}
else if(_n<_n2)
{
t.r0-=sqrt(_n-_n2);
}*/
*this=t;
return true;
}
void VSOMirror::calculateRotationVector()
{
Vec3D rrot(0,-fTelescope->reflectorRotation(),0);
Vec3D align(fAlign);
align.Rotate(rrot);
Vec3D normalize = align^Vec3D(0,1,0);
double sintheta = normalize.Norm();
if(sintheta == 0)
{
fRotationVector = rrot;
}
else
{
double costheta = align*Vec3D(0,1,0);
normalize *= atan(sintheta/costheta)/sintheta;
fRotationVector = rrot & normalize;
}
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/// Reset the direction of propagation, keeping energy fixed
/// \param v_hat: Direction of proagation, i.e. (vx/v, vy/v, vz/v)
inline void Particle::SetDirection( const Vec3D& v_hat)
{
p.r = v_hat*(sqrt(p.r0*p.r0-m2c4)/v_hat.Norm());
}
