musrTabulatedField3D Class Reference

#include <musrTabulatedField3D.hh>

List of all members.

Public Member Functions
	musrTabulatedField3D (const char *filename, double fieldValue)
void	GetFieldValue (const double Point[4], double *Bfield) const
G4double	GetFieldSetValue ()

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Detailed Description

Definition at line 11 of file musrTabulatedField3D.hh.

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Constructor & Destructor Documentation

musrTabulatedField3D::musrTabulatedField3D (  const char *  filename, double  fieldValue )

Definition at line 3 of file musrTabulatedField3D.cc. :ffieldValue(fieldValue),invertX(false),invertY(false),invertZ(false) { double lenUnit= meter; // double fieldUnit= tesla; G4cout << "\n-----------------------------------------------------------" << "\n Magnetic field" << "\n-----------------------------------------------------------" << endl; G4cout << " Field set to "<< fieldValue*1000 << " T"<< endl; G4cout << "\n ---> " "Reading the field grid from " << filename << " ... " << endl; ifstream file( filename ); // Open the file for reading. // Ignore first blank line char buffer[256]; file.getline(buffer,256); // Read table dimensions file >> nx >> ny >> nz; // Note dodgy order G4cout << " [ Number of values x,y,z: " << nx << " " << ny << " " << nz << " ] " << endl; // Set up storage space for table 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); } } // Ignore other header information // The first line whose second character is '0' is considered to // be the last line of the header. do { file.getline(buffer,256); } while ( buffer[1]!='0'); // Read in the data double xval,yval,zval,bx,by,bz; double permeability; // Not used in this example. 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 >> permeability; if ( ix==0 && iy==0 && iz==0 ) { minx = xval * lenUnit; miny = yval * lenUnit; minz = zval * lenUnit; } //xField[ix][iy][iz] = bx * fieldUnit * fieldValue; //yField[ix][iy][iz] = by * fieldUnit * fieldValue; //zField[ix][iy][iz] = bz * fieldUnit * fieldValue; xField[ix][iy][iz] = bx * fieldValue; yField[ix][iy][iz] = by * fieldValue; zField[ix][iy][iz] = bz * fieldValue; } } } file.close(); maxx = xval * lenUnit; maxy = yval * lenUnit; maxz = zval * lenUnit; G4cout << "\n ---> ... done reading " << endl; // G4cout << " Read values of field from file " << filename << endl; G4cout << " ---> assumed the order: x, y, z, Bx, By, Bz " << "\n ---> Min values x,y,z: " << minx/cm << " " << miny/cm << " " << minz/cm << " cm " << "\n ---> Max values x,y,z: " << maxx/cm << " " << maxy/cm << " " << maxz/cm << " cm " << endl; // 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/cm << " " << miny/cm << " " << minz/cm << " cm " << " \n ---> Max values x,y,z: " << maxx/cm << " " << maxy/cm << " " << maxz/cm << " cm "; dx = maxx - minx; dy = maxy - miny; dz = maxz - minz; G4cout << "\n ---> Dif values x,y,z (range): " << dx/cm << " " << dy/cm << " " << dz/cm << " cm in z " << "\n-----------------------------------------------------------" << endl; }

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Member Function Documentation

G4double musrTabulatedField3D::GetFieldSetValue (   )

Definition at line 194 of file musrTabulatedField3D.cc. { return ffieldValue; }

void musrTabulatedField3D::GetFieldValue (  const double  Point[4], double *  Bfield )  const

Definition at line 106 of file musrTabulatedField3D.cc. { double x = point[0]; double y = point[1]; double z = point[2]; // Check that the point is within the defined region if ( x>=minx && x<=maxx && y>=miny && y<=maxy && z>=minz && z<=maxz ) { // 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 = ( modf(xfraction*(nx-1), &xdindex)); double ylocal = ( modf(yfraction*(ny-1), &ydindex)); double zlocal = ( 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>(xdindex); int yindex = static_cast<int>(ydindex); int zindex = static_cast<int>(zdindex); #ifdef DEBUG_INTERPOLATING_FIELD G4cout << "Local x,y,z: " << xlocal << " " << ylocal << " " << zlocal << endl; G4cout << "Index x,y,z: " << xindex << " " << yindex << " " << zindex << endl; 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 ; } else { Bfield[0] = 0.0; Bfield[1] = 0.0; Bfield[2] = 0.0; } }

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The documentation for this class was generated from the following files:

• include/musrTabulatedField3D.hh
• src/musrTabulatedField3D.cc

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