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18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. *
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24 // ******************************************* 24 // ********************************************************************
25 // 25 //
26 // Code developed by: 26 // Code developed by:
27 // S.Larsson and J. Generowicz. 27 // S.Larsson and J. Generowicz.
28 // 28 //
29 // ************************************* 29 // *************************************
30 // * * 30 // * *
31 // * PurgMagTabulatedField3D.cc * 31 // * PurgMagTabulatedField3D.cc *
32 // * * 32 // * *
33 // ************************************* 33 // *************************************
34 // 34 //
>> 35 // $Id: PurgMagTabulatedField3D.cc,v 1.4 2006/06/29 16:06:25 gunter Exp $
>> 36 // GEANT4 tag $Name: geant4-09-03-patch-01 $
35 // 37 //
36 38
37 #include "PurgMagTabulatedField3D.hh" 39 #include "PurgMagTabulatedField3D.hh"
38 #include "G4SystemOfUnits.hh" <<
39 #include "G4AutoLock.hh" <<
40 40
41 namespace{ << 41 PurgMagTabulatedField3D::PurgMagTabulatedField3D( const char* filename, double zOffset )
42 G4Mutex myPurgMagTabulatedField3DLock = G4MU <<
43 } <<
44 <<
45 using namespace std; <<
46 <<
47 PurgMagTabulatedField3D::PurgMagTabulatedField <<
48 double zOffset ) <<
49 :fZoffset(zOffset),invertX(false),invertY(fa 42 :fZoffset(zOffset),invertX(false),invertY(false),invertZ(false)
50 { 43 {
51 44
52 double lenUnit= meter; 45 double lenUnit= meter;
53 double fieldUnit= tesla; 46 double fieldUnit= tesla;
54 G4cout << "\n------------------------------- 47 G4cout << "\n-----------------------------------------------------------"
55 << "\n Magnetic field" 48 << "\n Magnetic field"
56 << "\n------------------------------------- 49 << "\n-----------------------------------------------------------";
57 50
58 G4cout << "\n ---> " "Reading the field grid << 51 G4cout << "\n ---> " "Reading the field grid from " << filename << " ... " << endl;
59 <<
60 // <<
61 //This is a thread-local class and we have t <<
62 //file at the same time <<
63 G4AutoLock lock(&myPurgMagTabulatedField3DLo <<
64 <<
65 ifstream file( filename ); // Open the file 52 ifstream file( filename ); // Open the file for reading.
66 53
67 if (!file.is_open()) <<
68 { <<
69 G4ExceptionDescription ed; <<
70 ed << "Could not open input file " << fi <<
71 G4Exception("PurgMagTabulatedField3D::Pu <<
72 "pugmag001",FatalException,ed); <<
73 } <<
74 <<
75 // Ignore first blank line 54 // Ignore first blank line
76 char buffer[256]; 55 char buffer[256];
77 file.getline(buffer,256); 56 file.getline(buffer,256);
78 57
79 // Read table dimensions 58 // Read table dimensions
80 file >> nx >> ny >> nz; // Note dodgy order 59 file >> nx >> ny >> nz; // Note dodgy order
81 60
82 G4cout << " [ Number of values x,y,z: " 61 G4cout << " [ Number of values x,y,z: "
83 << nx << " " << ny << " " << nz << " ] " 62 << nx << " " << ny << " " << nz << " ] "
84 << G4endl; << 63 << endl;
85 64
86 // Set up storage space for table 65 // Set up storage space for table
87 xField.resize( nx ); 66 xField.resize( nx );
88 yField.resize( nx ); 67 yField.resize( nx );
89 zField.resize( nx ); 68 zField.resize( nx );
90 int ix, iy, iz; 69 int ix, iy, iz;
91 for (ix=0; ix<nx; ix++) { 70 for (ix=0; ix<nx; ix++) {
92 xField[ix].resize(ny); 71 xField[ix].resize(ny);
93 yField[ix].resize(ny); 72 yField[ix].resize(ny);
94 zField[ix].resize(ny); 73 zField[ix].resize(ny);
95 for (iy=0; iy<ny; iy++) { 74 for (iy=0; iy<ny; iy++) {
96 xField[ix][iy].resize(nz); 75 xField[ix][iy].resize(nz);
97 yField[ix][iy].resize(nz); 76 yField[ix][iy].resize(nz);
98 zField[ix][iy].resize(nz); 77 zField[ix][iy].resize(nz);
99 } 78 }
100 } 79 }
101 80
102 // Ignore other header information 81 // Ignore other header information
103 // The first line whose second character is 82 // The first line whose second character is '0' is considered to
104 // be the last line of the header. 83 // be the last line of the header.
105 do { 84 do {
106 file.getline(buffer,256); 85 file.getline(buffer,256);
107 } while ( buffer[1]!='0'); 86 } while ( buffer[1]!='0');
108 87
109 // Read in the data 88 // Read in the data
110 double xval,yval,zval,bx,by,bz; 89 double xval,yval,zval,bx,by,bz;
111 double permeability; // Not used in this exa 90 double permeability; // Not used in this example.
112 for (ix=0; ix<nx; ix++) { 91 for (ix=0; ix<nx; ix++) {
113 for (iy=0; iy<ny; iy++) { 92 for (iy=0; iy<ny; iy++) {
114 for (iz=0; iz<nz; iz++) { 93 for (iz=0; iz<nz; iz++) {
115 file >> xval >> yval >> zval >> bx >> 94 file >> xval >> yval >> zval >> bx >> by >> bz >> permeability;
116 if ( ix==0 && iy==0 && iz==0 ) { 95 if ( ix==0 && iy==0 && iz==0 ) {
117 minx = xval * lenUnit; 96 minx = xval * lenUnit;
118 miny = yval * lenUnit; 97 miny = yval * lenUnit;
119 minz = zval * lenUnit; 98 minz = zval * lenUnit;
120 } 99 }
121 xField[ix][iy][iz] = bx * fieldUnit; 100 xField[ix][iy][iz] = bx * fieldUnit;
122 yField[ix][iy][iz] = by * fieldUnit; 101 yField[ix][iy][iz] = by * fieldUnit;
123 zField[ix][iy][iz] = bz * fieldUnit; 102 zField[ix][iy][iz] = bz * fieldUnit;
124 } 103 }
125 } 104 }
126 } 105 }
127 file.close(); 106 file.close();
128 107
129 lock.unlock(); <<
130 <<
131 maxx = xval * lenUnit; 108 maxx = xval * lenUnit;
132 maxy = yval * lenUnit; 109 maxy = yval * lenUnit;
133 maxz = zval * lenUnit; 110 maxz = zval * lenUnit;
134 111
135 G4cout << "\n ---> ... done reading " << G4e << 112 G4cout << "\n ---> ... done reading " << endl;
136 113
137 // G4cout << " Read values of field from fil << 114 // G4cout << " Read values of field from file " << filename << endl;
138 G4cout << " ---> assumed the order: x, y, z 115 G4cout << " ---> assumed the order: x, y, z, Bx, By, Bz "
139 << "\n ---> Min values x,y,z: " 116 << "\n ---> Min values x,y,z: "
140 << minx/cm << " " << miny/cm << " " << minz 117 << minx/cm << " " << miny/cm << " " << minz/cm << " cm "
141 << "\n ---> Max values x,y,z: " 118 << "\n ---> Max values x,y,z: "
142 << maxx/cm << " " << maxy/cm << " " << maxz 119 << maxx/cm << " " << maxy/cm << " " << maxz/cm << " cm "
143 << "\n ---> The field will be offset by " < << 120 << "\n ---> The field will be offset by " << zOffset/cm << " cm " << endl;
144 121
145 // Should really check that the limits are n 122 // Should really check that the limits are not the wrong way around.
146 if (maxx < minx) {swap(maxx,minx); invertX = 123 if (maxx < minx) {swap(maxx,minx); invertX = true;}
147 if (maxy < miny) {swap(maxy,miny); invertY = 124 if (maxy < miny) {swap(maxy,miny); invertY = true;}
148 if (maxz < minz) {swap(maxz,minz); invertZ = 125 if (maxz < minz) {swap(maxz,minz); invertZ = true;}
149 G4cout << "\nAfter reordering if neccesary" 126 G4cout << "\nAfter reordering if neccesary"
150 << "\n ---> Min values x,y,z: " 127 << "\n ---> Min values x,y,z: "
151 << minx/cm << " " << miny/cm << " " << minz 128 << minx/cm << " " << miny/cm << " " << minz/cm << " cm "
152 << " \n ---> Max values x,y,z: " 129 << " \n ---> Max values x,y,z: "
153 << maxx/cm << " " << maxy/cm << " " << maxz 130 << maxx/cm << " " << maxy/cm << " " << maxz/cm << " cm ";
154 131
155 dx = maxx - minx; 132 dx = maxx - minx;
156 dy = maxy - miny; 133 dy = maxy - miny;
157 dz = maxz - minz; 134 dz = maxz - minz;
158 G4cout << "\n ---> Dif values x,y,z (range): 135 G4cout << "\n ---> Dif values x,y,z (range): "
159 << dx/cm << " " << dy/cm << " " << dz/cm << 136 << dx/cm << " " << dy/cm << " " << dz/cm << " cm in z "
160 << "\n------------------------------------- << 137 << "\n-----------------------------------------------------------" << endl;
161 } 138 }
162 139
163 void PurgMagTabulatedField3D::GetFieldValue(co 140 void PurgMagTabulatedField3D::GetFieldValue(const double point[4],
164 double *Bfield ) const 141 double *Bfield ) const
165 { 142 {
166 143
167 double x = point[0]; 144 double x = point[0];
168 double y = point[1]; 145 double y = point[1];
169 double z = point[2] + fZoffset; 146 double z = point[2] + fZoffset;
170 147
171 // Check that the point is within the define 148 // Check that the point is within the defined region
172 if ( x>=minx && x<=maxx && 149 if ( x>=minx && x<=maxx &&
173 y>=miny && y<=maxy && 150 y>=miny && y<=maxy &&
174 z>=minz && z<=maxz ) { 151 z>=minz && z<=maxz ) {
175 152
176 // Position of given point within region, 153 // Position of given point within region, normalized to the range
177 // [0,1] 154 // [0,1]
178 double xfraction = (x - minx) / dx; 155 double xfraction = (x - minx) / dx;
179 double yfraction = (y - miny) / dy; 156 double yfraction = (y - miny) / dy;
180 double zfraction = (z - minz) / dz; 157 double zfraction = (z - minz) / dz;
181 158
182 if (invertX) { xfraction = 1 - xfraction;} 159 if (invertX) { xfraction = 1 - xfraction;}
183 if (invertY) { yfraction = 1 - yfraction;} 160 if (invertY) { yfraction = 1 - yfraction;}
184 if (invertZ) { zfraction = 1 - zfraction;} 161 if (invertZ) { zfraction = 1 - zfraction;}
185 162
186 // Need addresses of these to pass to modf 163 // Need addresses of these to pass to modf below.
187 // modf uses its second argument as an OUT 164 // modf uses its second argument as an OUTPUT argument.
188 double xdindex, ydindex, zdindex; 165 double xdindex, ydindex, zdindex;
189 166
190 // Position of the point within the cuboid 167 // Position of the point within the cuboid defined by the
191 // nearest surrounding tabulated points 168 // nearest surrounding tabulated points
192 double xlocal = ( std::modf(xfraction*(nx- 169 double xlocal = ( std::modf(xfraction*(nx-1), &xdindex));
193 double ylocal = ( std::modf(yfraction*(ny- 170 double ylocal = ( std::modf(yfraction*(ny-1), &ydindex));
194 double zlocal = ( std::modf(zfraction*(nz- 171 double zlocal = ( std::modf(zfraction*(nz-1), &zdindex));
195 172
196 // The indices of the nearest tabulated po 173 // The indices of the nearest tabulated point whose coordinates
197 // are all less than those of the given po 174 // are all less than those of the given point
198 int xindex = static_cast<int>(xdindex); 175 int xindex = static_cast<int>(xdindex);
199 int yindex = static_cast<int>(ydindex); 176 int yindex = static_cast<int>(ydindex);
200 int zindex = static_cast<int>(zdindex); 177 int zindex = static_cast<int>(zdindex);
201 178
202 179
203 #ifdef DEBUG_INTERPOLATING_FIELD 180 #ifdef DEBUG_INTERPOLATING_FIELD
204 G4cout << "Local x,y,z: " << xlocal << " " << 181 G4cout << "Local x,y,z: " << xlocal << " " << ylocal << " " << zlocal << endl;
205 G4cout << "Index x,y,z: " << xindex << " " << 182 G4cout << "Index x,y,z: " << xindex << " " << yindex << " " << zindex << endl;
206 double valx0z0, mulx0z0, valx1z0, mulx1z0; 183 double valx0z0, mulx0z0, valx1z0, mulx1z0;
207 double valx0z1, mulx0z1, valx1z1, mulx1z1; 184 double valx0z1, mulx0z1, valx1z1, mulx1z1;
208 valx0z0= table[xindex ][0][zindex]; mulx 185 valx0z0= table[xindex ][0][zindex]; mulx0z0= (1-xlocal) * (1-zlocal);
209 valx1z0= table[xindex+1][0][zindex]; mulx 186 valx1z0= table[xindex+1][0][zindex]; mulx1z0= xlocal * (1-zlocal);
210 valx0z1= table[xindex ][0][zindex+1]; mul 187 valx0z1= table[xindex ][0][zindex+1]; mulx0z1= (1-xlocal) * zlocal;
211 valx1z1= table[xindex+1][0][zindex+1]; mul 188 valx1z1= table[xindex+1][0][zindex+1]; mulx1z1= xlocal * zlocal;
212 #endif 189 #endif
213 190
214 // Full 3-dimensional version 191 // Full 3-dimensional version
215 Bfield[0] = 192 Bfield[0] =
216 xField[xindex ][yindex ][zindex ] * ( 193 xField[xindex ][yindex ][zindex ] * (1-xlocal) * (1-ylocal) * (1-zlocal) +
217 xField[xindex ][yindex ][zindex+1] * ( 194 xField[xindex ][yindex ][zindex+1] * (1-xlocal) * (1-ylocal) * zlocal +
218 xField[xindex ][yindex+1][zindex ] * ( 195 xField[xindex ][yindex+1][zindex ] * (1-xlocal) * ylocal * (1-zlocal) +
219 xField[xindex ][yindex+1][zindex+1] * ( 196 xField[xindex ][yindex+1][zindex+1] * (1-xlocal) * ylocal * zlocal +
220 xField[xindex+1][yindex ][zindex ] * 197 xField[xindex+1][yindex ][zindex ] * xlocal * (1-ylocal) * (1-zlocal) +
221 xField[xindex+1][yindex ][zindex+1] * 198 xField[xindex+1][yindex ][zindex+1] * xlocal * (1-ylocal) * zlocal +
222 xField[xindex+1][yindex+1][zindex ] * 199 xField[xindex+1][yindex+1][zindex ] * xlocal * ylocal * (1-zlocal) +
223 xField[xindex+1][yindex+1][zindex+1] * 200 xField[xindex+1][yindex+1][zindex+1] * xlocal * ylocal * zlocal ;
224 Bfield[1] = 201 Bfield[1] =
225 yField[xindex ][yindex ][zindex ] * ( 202 yField[xindex ][yindex ][zindex ] * (1-xlocal) * (1-ylocal) * (1-zlocal) +
226 yField[xindex ][yindex ][zindex+1] * ( 203 yField[xindex ][yindex ][zindex+1] * (1-xlocal) * (1-ylocal) * zlocal +
227 yField[xindex ][yindex+1][zindex ] * ( 204 yField[xindex ][yindex+1][zindex ] * (1-xlocal) * ylocal * (1-zlocal) +
228 yField[xindex ][yindex+1][zindex+1] * ( 205 yField[xindex ][yindex+1][zindex+1] * (1-xlocal) * ylocal * zlocal +
229 yField[xindex+1][yindex ][zindex ] * 206 yField[xindex+1][yindex ][zindex ] * xlocal * (1-ylocal) * (1-zlocal) +
230 yField[xindex+1][yindex ][zindex+1] * 207 yField[xindex+1][yindex ][zindex+1] * xlocal * (1-ylocal) * zlocal +
231 yField[xindex+1][yindex+1][zindex ] * 208 yField[xindex+1][yindex+1][zindex ] * xlocal * ylocal * (1-zlocal) +
232 yField[xindex+1][yindex+1][zindex+1] * 209 yField[xindex+1][yindex+1][zindex+1] * xlocal * ylocal * zlocal ;
233 Bfield[2] = 210 Bfield[2] =
234 zField[xindex ][yindex ][zindex ] * ( 211 zField[xindex ][yindex ][zindex ] * (1-xlocal) * (1-ylocal) * (1-zlocal) +
235 zField[xindex ][yindex ][zindex+1] * ( 212 zField[xindex ][yindex ][zindex+1] * (1-xlocal) * (1-ylocal) * zlocal +
236 zField[xindex ][yindex+1][zindex ] * ( 213 zField[xindex ][yindex+1][zindex ] * (1-xlocal) * ylocal * (1-zlocal) +
237 zField[xindex ][yindex+1][zindex+1] * ( 214 zField[xindex ][yindex+1][zindex+1] * (1-xlocal) * ylocal * zlocal +
238 zField[xindex+1][yindex ][zindex ] * 215 zField[xindex+1][yindex ][zindex ] * xlocal * (1-ylocal) * (1-zlocal) +
239 zField[xindex+1][yindex ][zindex+1] * 216 zField[xindex+1][yindex ][zindex+1] * xlocal * (1-ylocal) * zlocal +
240 zField[xindex+1][yindex+1][zindex ] * 217 zField[xindex+1][yindex+1][zindex ] * xlocal * ylocal * (1-zlocal) +
241 zField[xindex+1][yindex+1][zindex+1] * 218 zField[xindex+1][yindex+1][zindex+1] * xlocal * ylocal * zlocal ;
242 219
243 } else { 220 } else {
244 Bfield[0] = 0.0; 221 Bfield[0] = 0.0;
245 Bfield[1] = 0.0; 222 Bfield[1] = 0.0;
246 Bfield[2] = 0.0; 223 Bfield[2] = 0.0;
247 } 224 }
248 } 225 }
249 226
250 227