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electricField.cc
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electricField.cc
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#include "electricField.hh"
using namespace std;
MyElectricField::MyElectricField()
{
double lenUnit = millimeter;
double fieldUnit = volt / meter;
ifstream file("elField.TAB"); // Open the file for reading.
//char buffer[256];
//file.getline(buffer, 256);
//file >> nx >> ny >> nz; // Note dodgy order
nx = 101;
ny = 101;
nz = 101;
G4cout << " [ Number of values x,y,z: "
<< nx << " " << ny << " " << nz << " ] "
<< G4endl;
xField.resize(nx);
yField.resize(nx);
zField.resize(nx);
int ix, iy, iz;
for (ix = 0; ix < nx; ix++) {
xField[ix].resize(ny);
yField[ix].resize(ny);
zField[ix].resize(ny);
for (iy = 0; iy < ny; iy++) {
xField[ix][iy].resize(nz);
yField[ix][iy].resize(nz);
zField[ix][iy].resize(nz);
}
}
// Read in the data
G4double xval = 0.;
G4double yval = 0.;
G4double zval = 0.;
G4double bx = 0.;
G4double by = 0.;
G4double bz = 0.;
for (ix = 0; ix < nx; ix++) {
for (iy = 0; iy < ny; iy++) {
for (iz = 0; iz < nz; iz++) {
file >> xval >> yval >> zval >> bx >> by >> bz;
//G4cout << "xval: " << xval << ", yval: " << yval << ", zval: " << zval << G4endl;
xval *= 1000;
yval *= 1000;
zval *= 1000;
//exit(0);
/*
if (isnan(xval))
{
xval = 0.0;
}
if (isnan(yval))
{
yval = 0.0;
}
if (isnan(zval))
{
zval = 0.0;
}
*/
if (ix == 0 && iy == 0 && iz == 0) {
minx = xval * lenUnit;
miny = yval * lenUnit;
minz = zval * lenUnit;
}
xField[ix][iy][iz] = bx * fieldUnit;
yField[ix][iy][iz] = by * fieldUnit;
zField[ix][iy][iz] = bz * fieldUnit;
}
}
}
file.close();
maxx = xval * lenUnit;
maxy = yval * lenUnit;
maxz = zval * lenUnit;
//
G4cout << "\n ---> ... done reading " << G4endl;
// G4cout << " Read values of field from file " << filename << G4endl;
G4cout << " ---> assumed the order: x, y, z, Bx, By, Bz "
<< "\n ---> Min values x,y,z: "
<< minx / mm << " " << miny / mm << " " << minz / mm << " mm "
<< "\n ---> Max values x,y,z: "
<< maxx / mm << " " << maxy / mm << " " << maxz / mm << " mm " << G4endl;
// Should really check that the limits are not the wrong way around.
//if (maxx < minx) { swap(maxx, minx); invertX = true; }
//if (maxy < miny) { swap(maxy, miny); invertY = true; }
//if (maxz < minz) { swap(maxz, minz); invertZ = true; }
G4cout << "\nAfter reordering if neccesary"
<< "\n ---> Min values x,y,z: "
<< minx / mm << " " << miny / mm << " " << minz / mm << " mm "
<< " \n ---> Max values x,y,z: "
<< maxx / mm << " " << maxy / mm << " " << maxz / mm << " mm ";
dx = maxx - minx;
dy = maxy - miny;
dz = maxz - minz;
G4cout << "\n ---> Dif values x,y,z (range): "
<< dx / m << " " << dy / m << " " << dz / m << " m in z "
<< "\n-----------------------------------------------------------" << G4endl;
}
MyElectricField::~MyElectricField()
{}
void MyElectricField::GetFieldValue(const G4double point[4], G4double* Bfield) const
{
double x = point[0];
double y = point[1];
double z = point[2];
// Position of given point within region, normalized to the range
// [0,1]
double xfraction = (x - minx) / dx;
double yfraction = (y - miny) / dy;
double zfraction = (z - minz) / dz;
//if (invertX) { xfraction = 1 - xfraction; }
//if (invertY) { yfraction = 1 - yfraction; }
//if (invertZ) { zfraction = 1 - zfraction; }
// Need addresses of these to pass to modf below.
// modf uses its second argument as an OUTPUT argument.
double xdindex, ydindex, zdindex;
// Position of the point within the cuboid defined by the
// nearest surrounding tabulated points
double xlocal = (std::modf(xfraction * (nx - 1), &xdindex));
double ylocal = (std::modf(yfraction * (ny - 1), &ydindex));
double zlocal = (std::modf(zfraction * (nz - 1), &zdindex));
// The indices of the nearest tabulated point whose coordinates
// are all less than those of the given point
int xindex = static_cast<int>(std::floor(xdindex));
int yindex = static_cast<int>(std::floor(ydindex));
int zindex = static_cast<int>(std::floor(zdindex));
// Check that the point is within the defined region
if ((xindex < 0) || (xindex >= nx - 1) ||
(yindex < 0) || (yindex >= ny - 1) ||
(zindex < 0) || (zindex >= nz - 1))
{
Bfield[0] = 0.0;
Bfield[1] = 0.0;
Bfield[2] = 0.0;
}
else
{
#ifdef DEBUG_INTERPOLATING_FIELD
G4cout << "Local x,y,z: " << xlocal << " " << ylocal << " " << zlocal << G4endl;
G4cout << "Index x,y,z: " << xindex << " " << yindex << " " << zindex << G4endl;
double valx0z0, mulx0z0, valx1z0, mulx1z0;
double valx0z1, mulx0z1, valx1z1, mulx1z1;
valx0z0 = table[xindex][0][zindex]; mulx0z0 = (1 - xlocal) * (1 - zlocal);
valx1z0 = table[xindex + 1][0][zindex]; mulx1z0 = xlocal * (1 - zlocal);
valx0z1 = table[xindex][0][zindex + 1]; mulx0z1 = (1 - xlocal) * zlocal;
valx1z1 = table[xindex + 1][0][zindex + 1]; mulx1z1 = xlocal * zlocal;
#endif
// Full 3-dimensional version
Bfield[0] =
xField[xindex][yindex][zindex] * (1 - xlocal) * (1 - ylocal) * (1 - zlocal) +
xField[xindex][yindex][zindex + 1] * (1 - xlocal) * (1 - ylocal) * zlocal +
xField[xindex][yindex + 1][zindex] * (1 - xlocal) * ylocal * (1 - zlocal) +
xField[xindex][yindex + 1][zindex + 1] * (1 - xlocal) * ylocal * zlocal +
xField[xindex + 1][yindex][zindex] * xlocal * (1 - ylocal) * (1 - zlocal) +
xField[xindex + 1][yindex][zindex + 1] * xlocal * (1 - ylocal) * zlocal +
xField[xindex + 1][yindex + 1][zindex] * xlocal * ylocal * (1 - zlocal) +
xField[xindex + 1][yindex + 1][zindex + 1] * xlocal * ylocal * zlocal;
Bfield[1] =
yField[xindex][yindex][zindex] * (1 - xlocal) * (1 - ylocal) * (1 - zlocal) +
yField[xindex][yindex][zindex + 1] * (1 - xlocal) * (1 - ylocal) * zlocal +
yField[xindex][yindex + 1][zindex] * (1 - xlocal) * ylocal * (1 - zlocal) +
yField[xindex][yindex + 1][zindex + 1] * (1 - xlocal) * ylocal * zlocal +
yField[xindex + 1][yindex][zindex] * xlocal * (1 - ylocal) * (1 - zlocal) +
yField[xindex + 1][yindex][zindex + 1] * xlocal * (1 - ylocal) * zlocal +
yField[xindex + 1][yindex + 1][zindex] * xlocal * ylocal * (1 - zlocal) +
yField[xindex + 1][yindex + 1][zindex + 1] * xlocal * ylocal * zlocal;
Bfield[2] =
zField[xindex][yindex][zindex] * (1 - xlocal) * (1 - ylocal) * (1 - zlocal) +
zField[xindex][yindex][zindex + 1] * (1 - xlocal) * (1 - ylocal) * zlocal +
zField[xindex][yindex + 1][zindex] * (1 - xlocal) * ylocal * (1 - zlocal) +
zField[xindex][yindex + 1][zindex + 1] * (1 - xlocal) * ylocal * zlocal +
zField[xindex + 1][yindex][zindex] * xlocal * (1 - ylocal) * (1 - zlocal) +
zField[xindex + 1][yindex][zindex + 1] * xlocal * (1 - ylocal) * zlocal +
zField[xindex + 1][yindex + 1][zindex] * xlocal * ylocal * (1 - zlocal) +
zField[xindex + 1][yindex + 1][zindex + 1] * xlocal * ylocal * zlocal;
}
}