| aa9bc63b |
1 | /************************************************************************** |
| 2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * |
| 3 | * * |
| 4 | * Author: The ALICE Off-line Project. * |
| 5 | * Contributors are mentioned in the code where appropriate. * |
| 6 | * * |
| 7 | * Permission to use, copy, modify and distribute this software and its * |
| 8 | * documentation strictly for non-commercial purposes is hereby granted * |
| 9 | * without fee, provided that the above copyright notice appears in all * |
| 10 | * copies and that both the copyright notice and this permission notice * |
| 11 | * appear in the supporting documentation. The authors make no claims * |
| 12 | * about the suitability of this software for any purpose. It is * |
| 13 | * provided "as is" without express or implied warranty. * |
| 14 | **************************************************************************/ |
| 15 | |
| 16 | /* |
| 17 | $Log$ |
| 18 | |
| 19 | $Id$ |
| 20 | */ |
| 21 | |
| 22 | /* |
| 23 | A base geometry class defining all of the ITS volumes that make up an ITS |
| 24 | geometry. |
| 25 | Auhors: B. S. Nilsen |
| 26 | Version 0 |
| 27 | Created February 2003. |
| 28 | */ |
| 29 | |
| 30 | #include <Riostream.h> |
| 31 | #include <stdio.h> |
| 32 | #include <stdlib.h> |
| 33 | #include <string.h> |
| 34 | #include <TMath.h> |
| 35 | #include <TGeometry.h> |
| 36 | #include <TNode.h> |
| 37 | #include <TTUBE.h> |
| 38 | #include <TTUBS.h> |
| 39 | #include <TPCON.h> |
| 40 | #include <TFile.h> // only required for Tracking function? |
| 41 | #include <TCanvas.h> |
| 42 | #include <TObjArray.h> |
| 43 | #include <TLorentzVector.h> |
| 44 | #include <TObjString.h> |
| 45 | #include <TClonesArray.h> |
| 46 | #include <TBRIK.h> |
| 47 | #include <TSystem.h> |
| 48 | #include <AliRun.h> |
| 49 | #include <AliMagF.h> |
| 50 | #include <AliConst.h> |
| 51 | #include "AliITSBaseGeometry.h" |
| 52 | |
| 53 | ClassImp(AliITSBaseGeometry) |
| 54 | //______________________________________________________________________ |
| 55 | AliITSBaseGeometry::AliITSBaseGeometry(){ |
| 56 | // Default construtor for the ITS Base Geometry class. |
| 57 | // Inputs: |
| 58 | // none. |
| 59 | // Outputs: |
| 60 | // none. |
| 61 | // Return: |
| 62 | // none. |
| 63 | |
| 64 | fScale = 1.0; // Default value. |
| 65 | fits = 0; // zero pointers. |
| 66 | fNCreates++; // incrament this creation counter. |
| 67 | } |
| 68 | //______________________________________________________________________ |
| 69 | AliITSBaseGeometry::AliITSBaseGeometry(AliModule *its,Int_t iflag){ |
| 70 | // Standard construtor for the ITS Base Geometry class. |
| 71 | // Inputs: |
| 72 | // Int_t iflag flag to indecate specific swiches in the geometry |
| 73 | // Outputs: |
| 74 | // none. |
| 75 | // Return: |
| 76 | // none. |
| 77 | |
| 78 | fScale = 1.0; // Default value. |
| 79 | fits = its; // get a copy of the pointer to the ITS. |
| 80 | fNCreates++; // incrament this creation counter. |
| 81 | } |
| 82 | //______________________________________________________________________ |
| 83 | AliITSBaseGeometry::~AliITSBaseGeometry(){ |
| 84 | // Standeard destructor for the ITS Base Geometry class. |
| 85 | // Inputs: |
| 86 | // Int_t iflag flag to indecate specific swiches in the geometry |
| 87 | // Outputs: |
| 88 | // none. |
| 89 | // Return: |
| 90 | // none. |
| 91 | |
| 92 | fits = 0; // This class does not own this class. It contaitns a pointer |
| 93 | // to it for conveniance. |
| 94 | fidmed = 0; // This class does not own this array of media indexs. It |
| 95 | fNCreates--; |
| 96 | if(fNCreates==0){ // Now delete the static members |
| 97 | Int_t i; |
| 98 | if(fVolName!=0){ |
| 99 | for(i=0;i<fVolNameLast;i++) delete fVolName[i]; |
| 100 | fVolNameSize = 0; |
| 101 | fVolNameLast = 0; |
| 102 | delete[] fVolName; |
| 103 | }// end if |
| 104 | delete[] fidrot; |
| 105 | fidrotsize = fidrotlast = 0; |
| 106 | }// end if |
| 107 | } |
| 108 | //______________________________________________________________________ |
| 109 | Int_t AliITSBaseGeometry::AddVolName(const TString name){ |
| 110 | // Checks if the volume name already exist, if not it adds it to |
| 111 | // the list of volume names and returns an index to that volume name. |
| 112 | // it will create and expand the array of volume names as needed. |
| 113 | // If the volume name already exists, it will give an error message and |
| 114 | // return an index <0. |
| 115 | // Inputs: |
| 116 | // const TString name Volume name to be added to the list. |
| 117 | // Outputs: |
| 118 | // none. |
| 119 | // Return: |
| 120 | // The index where this volume name is stored. |
| 121 | Int_t i; |
| 122 | |
| 123 | if(fVolName==0){ // must create array. |
| 124 | fVolNameSize = 1000; |
| 125 | fVolName = new TString[fVolNameSize]; |
| 126 | fVolNameLast = 0; |
| 127 | } // end if |
| 128 | for(i=0;i<fVolNameLast;i++) if(fVolName[i].CompareTo(name)==0){ // Error |
| 129 | Error("AddVolName","Volume name already exists for volume %d",i); |
| 130 | return -1; |
| 131 | } // end for i |
| 132 | if(fVolNameSize==fVolNameLast-1){ // Array is full must expand. |
| 133 | Int_t size = fVolNameSize*2; |
| 134 | TString *old = fVolName; |
| 135 | fVolName = new TString[fVolNameSize]; |
| 136 | for(i=0;i<fVolNameLast;i++) fVolName[i] = old[i]; |
| 137 | delete[] old; |
| 138 | fVolNameSize = size; |
| 139 | } // end if |
| 140 | if(strcmp(ITSIndexToITSG3name(fVolNameLast),"ITSV")==0){ |
| 141 | // Special Reserved Geant 3 volumen name. Skip it |
| 142 | // fill it with explination for conveniance. |
| 143 | fVolName[fVolNameLast] = "ITS Master Mother Volume"; |
| 144 | fVolNameLast++; |
| 145 | } // end if |
| 146 | fVolName[fVolNameLast] = name; |
| 147 | fVolNameLast++; |
| 148 | return fVolNameLast-1; // return the index |
| 149 | } |
| 150 | //______________________________________________________________________ |
| 151 | char* AliITSBaseGeometry::ITSIndexToITSG3name(const Int_t i){ |
| 152 | // Given the ITS volume index i, it returns the Geant3 ITS volume |
| 153 | // name. The valid characters must be in the range |
| 154 | // '0' through 'Z'. This will include all upper case letter and the |
| 155 | // numbers 0-9. In addition it does not will include the following simbols |
| 156 | // ":;<=>?@" |
| 157 | // Inputs: |
| 158 | // const Int_t i the ITS volume index |
| 159 | // Output: |
| 160 | // none. |
| 161 | // Return: |
| 162 | // char[4] with the ITS volume name starting from "I000" to "IZZZ" |
| 163 | const Int_t rangen=(Int_t)('9'-'0'+1); // range of numbers |
| 164 | const Int_t rangel=(Int_t)('Z'-'A'+1); // range of letters |
| 165 | const Int_t range = rangen+rangel; // the number of characters between |
| 166 | // 0-9 and A-Z. |
| 167 | char a[4]; |
| 168 | Int_t j = i; |
| 169 | |
| 170 | a[0] = (char)('I'); |
| 171 | a[1] = (char)('0'+j/(range*range)); |
| 172 | if(a[1]>'9') a[1] += 'A'-'0'; // if it is a letter add in gap for simples. |
| 173 | j -= range*range*(a[1]-'0'); |
| 174 | a[2] = (char)('0'+j/range); |
| 175 | if(a[2]>'9') a[2] += 'A'-'0'; // if it is a letter add in gap for simples. |
| 176 | j -= range*(a[2]-'0'); |
| 177 | a[3] = (char)('0'+j); |
| 178 | if(a[3]>'9') a[3] += 'A'-'0'; // if it is a letter add in gap for simples. |
| 179 | return a; |
| 180 | } |
| 181 | //______________________________________________________________________ |
| 182 | Int_t AliITSBaseGeometry::ITSG3VnameToIndex(const char name[3])const{ |
| 183 | // Given the last three characters of the ITS Geant3 volume name, |
| 184 | // this returns the index. The valid characters must be in the range |
| 185 | // '0' through 'Z'. This will include all upper case letter and the |
| 186 | // numbers 0-9. In addition it will include the following simbles |
| 187 | // ":;<=>?@" |
| 188 | // Inputs: |
| 189 | // const char name[3] The last three characters of the ITS Geant3 |
| 190 | // volume name |
| 191 | // Output: |
| 192 | // none. |
| 193 | // Return: |
| 194 | // Int_t the index. |
| 195 | const Int_t rangen=(Int_t)('9'-'0'+1); // range of numbers |
| 196 | const Int_t rangel=(Int_t)('Z'-'A'+1); // range of letters |
| 197 | const Int_t range = rangen+rangel; // the number of characters between |
| 198 | // 0-9 and A-Z. |
| 199 | Int_t i,j; |
| 200 | |
| 201 | i = 0; |
| 202 | for(j=3;j>-1;j--){ |
| 203 | if(isdigit(name[j])){ // number |
| 204 | i += (Int_t)(name[j]-'0')*TMath::Power(range,(Double_t)j); |
| 205 | }else{ // Letter |
| 206 | i += (Int_t)(name[j]-'A'+rangen)*TMath::Power(range,(Double_t)j); |
| 207 | } // end if |
| 208 | } // end for j |
| 209 | return i; |
| 210 | } |
| 211 | //______________________________________________________________________ |
| 212 | TString AliITSBaseGeometry::GetVolName(const Int_t i)const{ |
| 213 | // Returns the volume name at a given index i. Index must be in |
| 214 | // range and the array of volume names must exist. If there is an |
| 215 | // error, a message is written and 0 is returned. |
| 216 | // Inputs: |
| 217 | // const Int_t i Index |
| 218 | // Output: |
| 219 | // none. |
| 220 | // Return: |
| 221 | // A TString contianing the ITS volume name. |
| 222 | |
| 223 | if(i<0||i>=fVolNameLast){ |
| 224 | Error("GetVolName","Index=%d out of range but be witin 0<%d",i, |
| 225 | fVolName-1); |
| 226 | return 0; |
| 227 | } // end if Error |
| 228 | return fVolName[i]; |
| 229 | } |
| 230 | //______________________________________________________________________ |
| 231 | Int_t AliITSBaseGeometry::GetVolumeIndex(const TString &a){ |
| 232 | // Return the index corresponding the the volume name a. If the |
| 233 | // Volumen name is not found, return -1, and a warning message given. |
| 234 | // Inputs: |
| 235 | // const TString &a Name of volume for which index is wanted. |
| 236 | // Output: |
| 237 | // none. |
| 238 | // Return: |
| 239 | // Int_t Index corresponding the volume a. If not found -1 is returned. |
| 240 | Int_t i; |
| 241 | |
| 242 | for(i=0;i<fVolNameLast;i++) if(fVolName[i].CompareTo(a)==0) return i; |
| 243 | Info("GetVolumeIndex","Volume name %s not found",a.Data()); |
| 244 | return -1; |
| 245 | } |
| 246 | //______________________________________________________________________ |
| 247 | void AliITSBaseGeometry::Box(const char gnam[3],const TString &dis, |
| 248 | Double_t dx,Double_t dy,Double_t dz,Int_t med){ |
| 249 | // Interface to TMC->Gsvolu() for ITS bos geometries. Box with faces |
| 250 | // perpendicular to the axes. It has 3 paramters. See SetScale() for |
| 251 | // units. Default units are geant 3 [cm]. |
| 252 | // Inputs: |
| 253 | // const char gnam[3] 3 character geant volume name. The letter "I" |
| 254 | // is appended to the front to indecate that this |
| 255 | // is an ITS volume. |
| 256 | // TString &dis String containging part discription. |
| 257 | // Double_t dx half-length of box in x-axis |
| 258 | // Double_t dy half-length of box in y-axis |
| 259 | // Double_t dz half-length of box in z-axis |
| 260 | // Int_t med media index number. |
| 261 | // Output: |
| 262 | // none. |
| 263 | // Return. |
| 264 | // none. |
| 265 | char name[4]; |
| 266 | Float_t param[3]; |
| 267 | |
| 268 | if(fidmed==0) SetMedArray(); |
| 269 | param[0] = fScale*dx; |
| 270 | param[1] = fScale*dy; |
| 271 | param[2] = fScale*dz; |
| 272 | name[3] = 'I'; |
| 273 | for(Int_t i=0;i<3;i++) name[i+1] = gnam[i]; |
| 274 | gMC->Gsvolu(name,"BOX ",fidmed[med],param,3); |
| 275 | } |
| 276 | //______________________________________________________________________ |
| 277 | void AliITSBaseGeometry::Trapezoid1(const char gnam[3],const TString &dis, |
| 278 | Double_t dxn,Double_t dxp,Double_t dy, |
| 279 | Double_t dz,Int_t med){ |
| 280 | // Interface to TMC->Gsvolu() for ITS TRD1 geometries. Trapezoid with the |
| 281 | // x dimension varing along z. It has 4 parameters. See SetScale() for |
| 282 | // units. Default units are geant 3 [cm]. |
| 283 | // Inputs: |
| 284 | // const char gnam[3] 3 character geant volume name. The letter "I" |
| 285 | // is appended to the front to indecate that this |
| 286 | // is an ITS volume. |
| 287 | // TString &dis String containging part discription. |
| 288 | // Double_t dxn half-length along x at the z surface positioned |
| 289 | // at -DZ |
| 290 | // Double_t dxp half-length along x at the z surface positioned |
| 291 | // at +DZ |
| 292 | // Double_t dy half-length along the y-axis |
| 293 | // Double_t dz half-length along the z-axis |
| 294 | // Int_t med media index number. |
| 295 | // Output: |
| 296 | // none. |
| 297 | // Return. |
| 298 | // none. |
| 299 | char name[4]; |
| 300 | Float_t param[4]; |
| 301 | |
| 302 | if(fidmed==0) SetMedArray(); |
| 303 | param[0] = fScale*dxn; |
| 304 | param[1] = fScale*dxp; |
| 305 | param[2] = fScale*dy; |
| 306 | param[3] = fScale*dz; |
| 307 | name[3] = 'I'; |
| 308 | for(Int_t i=0;i<3;i++) name[i+1] = gnam[i]; |
| 309 | gMC->Gsvolu(name,"TRD1",fidmed[med],param,4); |
| 310 | } |
| 311 | //______________________________________________________________________ |
| 312 | void AliITSBaseGeometry::Trapezoid2(const char gnam[3],const TString &dis, |
| 313 | Double_t dxn,Double_t dxp,Double_t dyn, |
| 314 | Double_t dyp,Double_t dz,Int_t med){ |
| 315 | // Interface to TMC->Gsvolu() for ITS TRD2 geometries. Trapezoid with the |
| 316 | // x and y dimension varing along z. It has 5 parameters. See SetScale() |
| 317 | // for units. Default units are geant 3 [cm]. |
| 318 | // Inputs: |
| 319 | // const char gnam[3] 3 character geant volume name. The letter "I" |
| 320 | // is appended to the front to indecate that this |
| 321 | // is an ITS volume. |
| 322 | // TString &dis String containging part discription. |
| 323 | // Double_t dxn half-length along x at the z surface positioned |
| 324 | // at -DZ |
| 325 | // Double_t dxp half-length along x at the z surface positioned |
| 326 | // at +DZ |
| 327 | // Double_t dyn half-length along x at the z surface positioned |
| 328 | // at -DZ |
| 329 | // Double_t dyp half-length along x at the z surface positioned |
| 330 | // at +DZ |
| 331 | // Double_t dz half-length along the z-axis |
| 332 | // Int_t med media index number. |
| 333 | // Output: |
| 334 | // none. |
| 335 | // Return. |
| 336 | // none. |
| 337 | char name[4]; |
| 338 | Float_t param[5]; |
| 339 | |
| 340 | if(fidmed==0) SetMedArray(); |
| 341 | param[0] = fScale*dxn; |
| 342 | param[1] = fScale*dxp; |
| 343 | param[2] = fScale*dyn; |
| 344 | param[3] = fScale*dyp; |
| 345 | param[4] = fScale*dz; |
| 346 | name[3] = 'I'; |
| 347 | for(Int_t i=0;i<3;i++) name[i+1] = gnam[i]; |
| 348 | gMC->Gsvolu(name,"TRD2",fidmed[med],param,5); |
| 349 | } |
| 350 | //______________________________________________________________________ |
| 351 | void AliITSBaseGeometry::Trapezoid(const char gnam[3],const TString &dis, |
| 352 | Double_t dz,Double_t thet,Double_t phi, |
| 353 | Double_t h1,Double_t bl1,Double_t tl1, |
| 354 | Double_t alp1,Double_t h2,Double_t bl2, |
| 355 | Double_t tl2,Double_t alp2,Int_t med){ |
| 356 | // Interface to TMC->Gsvolu() for ITS TRAP geometries. General Trapezoid, |
| 357 | // The faces perpendicular to z are trapezia and their centers are not |
| 358 | // necessarily on a line parallel to the z axis. This shape has 11 |
| 359 | // parameters, but only cosidering that the faces should be planar, only 9 |
| 360 | // are really independent. A check is performed on the user parameters and |
| 361 | // a message is printed in case of non-planar faces. Ignoring this warning |
| 362 | // may cause unpredictable effects at tracking time. See SetScale() |
| 363 | // for units. Default units are geant 3 [cm]. |
| 364 | // Inputs: |
| 365 | // const char gnam[3] 3 character geant volume name. The letter "I" |
| 366 | // is appended to the front to indecate that this |
| 367 | // is an ITS volume. |
| 368 | // TString &dis String containging part discription. |
| 369 | // Double_t dz Half-length along the z-asix |
| 370 | // Double_t thet Polar angle of the line joing the center of the |
| 371 | // face at -dz to the center of the one at dz |
| 372 | // [degree]. |
| 373 | // Double_t phi aximuthal angle of the line joing the center of |
| 374 | // the face at -dz to the center of the one at +dz |
| 375 | // [degree]. |
| 376 | // Double_t h1 half-length along y of the face at -dz. |
| 377 | // Double_t bl1 half-length along x of the side at -h1 in y of |
| 378 | // the face at -dz in z. |
| 379 | // Double_t tl1 half-length along x of teh side at +h1 in y of |
| 380 | // the face at -dz in z. |
| 381 | // Double_t alp1 angle with respect to the y axis from the center |
| 382 | // of the side at -h1 in y to the cetner of the |
| 383 | // side at +h1 in y of the face at -dz in z |
| 384 | // [degree]. |
| 385 | // Double_t h2 half-length along y of the face at +dz |
| 386 | // Double_t bl2 half-length along x of the side at -h2 in y of |
| 387 | // the face at +dz in z. |
| 388 | // Double_t tl2 half-length along x of the side at _h2 in y of |
| 389 | // the face at +dz in z. |
| 390 | // Double_t alp2 angle with respect to the y axis from the center |
| 391 | // of the side at -h2 in y to the center of the |
| 392 | // side at +h2 in y of the face at +dz in z |
| 393 | // [degree]. |
| 394 | // Int_t med media index number. |
| 395 | // Output: |
| 396 | // none. |
| 397 | // Return. |
| 398 | // none. |
| 399 | char name[4]; |
| 400 | Float_t param[11]; |
| 401 | |
| 402 | if(fidmed==0) SetMedArray(); |
| 403 | param[0] = fScale*dz; |
| 404 | param[1] = thet; |
| 405 | param[2] = phi; |
| 406 | param[3] = fScale*h1; |
| 407 | param[4] = fScale*bl1; |
| 408 | param[5] = fScale*tl1; |
| 409 | param[6] = alp1; |
| 410 | param[7] = fScale*h2; |
| 411 | param[8] = fScale*bl2; |
| 412 | param[9] = fScale*tl2; |
| 413 | param[10] = alp2; |
| 414 | name[3] = 'I'; |
| 415 | for(Int_t i=0;i<3;i++) name[i+1] = gnam[i]; |
| 416 | gMC->Gsvolu(name,"TRAP",fidmed[med],param,11); |
| 417 | } |
| 418 | //______________________________________________________________________ |
| 419 | void AliITSBaseGeometry::Tube(const char gnam[3],const TString &dis, |
| 420 | Double_t rmin,Double_t rmax,Double_t dz, |
| 421 | Int_t med){ |
| 422 | // Interface to TMC->Gsvolu() for ITS TUBE geometries. Simple Tube. It has |
| 423 | // 3 parameters. See SetScale() |
| 424 | // for units. Default units are geant 3 [cm]. |
| 425 | // Inputs: |
| 426 | // const char gnam[3] 3 character geant volume name. The letter "I" |
| 427 | // is appended to the front to indecate that this |
| 428 | // is an ITS volume. |
| 429 | // TString &dis String containging part discription. |
| 430 | // Double_t rmin Inside Radius. |
| 431 | // Double_t rmax Outside Radius. |
| 432 | // Double_t dz half-length along the z-axis |
| 433 | // Int_t med media index number. |
| 434 | // Output: |
| 435 | // none. |
| 436 | // Return. |
| 437 | // none. |
| 438 | char name[4]; |
| 439 | Float_t param[3]; |
| 440 | |
| 441 | if(fidmed==0) SetMedArray(); |
| 442 | param[0] = fScale*rmin; |
| 443 | param[1] = fScale*rmax; |
| 444 | param[2] = fScale*dz; |
| 445 | name[3] = 'I'; |
| 446 | for(Int_t i=0;i<3;i++) name[i+1] = gnam[i]; |
| 447 | gMC->Gsvolu(name,"TUBE",fidmed[med],param,3); |
| 448 | } |
| 449 | //______________________________________________________________________ |
| 450 | void AliITSBaseGeometry::TubeSegment(const char gnam[3],const TString &dis, |
| 451 | Double_t rmin,Double_t rmax,Double_t dz, |
| 452 | Double_t phi1,Double_t phi2,Int_t med){ |
| 453 | // Interface to TMC->Gsvolu() for ITS TUBE geometries. Phi segment of a |
| 454 | // tube. It has 5 parameters. Phi1 should be smaller than phi2. If this is |
| 455 | // not the case, the system adds 360 degrees to phi2. See SetScale() |
| 456 | // for units. Default units are geant 3 [cm]. |
| 457 | // Inputs: |
| 458 | // const char gnam[3] 3 character geant volume name. The letter "I" |
| 459 | // is appended to the front to indecate that this |
| 460 | // is an ITS volume. |
| 461 | // TString &dis String containging part discription. |
| 462 | // Double_t rmin Inside Radius. |
| 463 | // Double_t rmax Outside Radius. |
| 464 | // Double_t dz half-length along the z-axis |
| 465 | // Double_t phi1 Starting angle of the segment [degree]. |
| 466 | // Double_t phi2 Ending angle of the segment [degree]. |
| 467 | // Int_t med media index number. |
| 468 | // Output: |
| 469 | // none. |
| 470 | // Return. |
| 471 | // none. |
| 472 | char name[4]; |
| 473 | Float_t param[5]; |
| 474 | |
| 475 | if(fidmed==0) SetMedArray(); |
| 476 | param[0] = fScale*rmin; |
| 477 | param[1] = fScale*rmax; |
| 478 | param[2] = fScale*dz; |
| 479 | param[3] = phi1; |
| 480 | param[4] = phi2; |
| 481 | name[3] = 'I'; |
| 482 | for(Int_t i=0;i<3;i++) name[i+1] = gnam[i]; |
| 483 | gMC->Gsvolu(name,"TUBS",fidmed[med],param,5); |
| 484 | } |
| 485 | //______________________________________________________________________ |
| 486 | void AliITSBaseGeometry::Cone(const char gnam[3],const TString &dis, |
| 487 | Double_t dz,Double_t rmin1,Double_t rmax1, |
| 488 | Double_t rmin2,Double_t rmax2,Int_t med){ |
| 489 | // Interface to TMC->Gsvolu() for ITS Cone geometries. Conical tube. It |
| 490 | // has 5 parameters. See SetScale() |
| 491 | // for units. Default units are geant 3 [cm]. |
| 492 | // Inputs: |
| 493 | // const char gnam[3] 3 character geant volume name. The letter "I" |
| 494 | // is appended to the front to indecate that this |
| 495 | // is an ITS volume. |
| 496 | // TString &dis String containging part discription. |
| 497 | // Double_t dz half-length along the z-axis |
| 498 | // Double_t rmin1 Inside Radius at -dz. |
| 499 | // Double_t rmax1 Outside Radius at -dz. |
| 500 | // Double_t rmin2 inside radius at +dz. |
| 501 | // Double_t rmax2 outside radius at +dz. |
| 502 | // Int_t med media index number. |
| 503 | // Output: |
| 504 | // none. |
| 505 | // Return. |
| 506 | // none. |
| 507 | char name[4]; |
| 508 | Float_t param[5]; |
| 509 | |
| 510 | if(fidmed==0) SetMedArray(); |
| 511 | param[0] = fScale*dz; |
| 512 | param[1] = fScale*rmin1; |
| 513 | param[2] = fScale*rmax1; |
| 514 | param[3] = fScale*rmin2; |
| 515 | param[4] = fScale*rmax2; |
| 516 | name[3] = 'I'; |
| 517 | for(Int_t i=0;i<3;i++) name[i+1] = gnam[i]; |
| 518 | gMC->Gsvolu(name,"CONS",fidmed[med],param,5); |
| 519 | } |
| 520 | //______________________________________________________________________ |
| 521 | void AliITSBaseGeometry::ConeSegment(const char gnam[3],const TString &dis, |
| 522 | Double_t dz,Double_t rmin1,Double_t rmax1, |
| 523 | Double_t rmin2,Double_t rmax2, |
| 524 | Double_t phi1,Double_t phi2,Int_t med){ |
| 525 | // Interface to TMC->Gsvolu() for ITS ConS geometries. One segment of a |
| 526 | // conical tube. It has 7 parameters. Phi1 should be smaller than phi2. If |
| 527 | // this is not the case, the system adds 360 degrees to phi2. See |
| 528 | // SetScale() for units. Default units are geant 3 [cm]. |
| 529 | // Inputs: |
| 530 | // const char gnam[3] 3 character geant volume name. The letter "I" |
| 531 | // is appended to the front to indecate that this |
| 532 | // is an ITS volume. |
| 533 | // TString &dis String containging part discription. |
| 534 | // Double_t dz half-length along the z-axis |
| 535 | // Double_t rmin1 Inside Radius at -dz. |
| 536 | // Double_t rmax1 Outside Radius at -dz. |
| 537 | // Double_t rmin2 inside radius at +dz. |
| 538 | // Double_t rmax2 outside radius at +dz. |
| 539 | // Double_t phi1 Starting angle of the segment [degree]. |
| 540 | // Double_t phi2 Ending angle of the segment [degree]. |
| 541 | // Int_t med media index number. |
| 542 | // Output: |
| 543 | // none. |
| 544 | // Return. |
| 545 | // none. |
| 546 | char name[4]; |
| 547 | Float_t param[7]; |
| 548 | |
| 549 | if(fidmed==0) SetMedArray(); |
| 550 | param[0] = fScale*dz; |
| 551 | param[1] = fScale*rmin1; |
| 552 | param[2] = fScale*rmax1; |
| 553 | param[3] = fScale*rmin2; |
| 554 | param[4] = fScale*rmax2; |
| 555 | param[5] = phi1; |
| 556 | param[6] = phi2; |
| 557 | name[3] = 'I'; |
| 558 | for(Int_t i=0;i<3;i++) name[i+1] = gnam[i]; |
| 559 | gMC->Gsvolu(name,"CONS",fidmed[med],param,7); |
| 560 | } |
| 561 | //______________________________________________________________________ |
| 562 | void AliITSBaseGeometry::Sphere(const char gnam[3],const TString &dis, |
| 563 | Double_t rmin,Double_t rmax,Double_t the1, |
| 564 | Double_t the2,Double_t phi1,Double_t phi2, |
| 565 | Int_t med){ |
| 566 | // Interface to TMC->Gsvolu() for ITS SPHE geometries. Segment of a |
| 567 | // sphereical shell. It has 6 parameters. See SetScale() |
| 568 | // for units. Default units are geant 3 [cm]. |
| 569 | // Inputs: |
| 570 | // const char gnam[3] 3 character geant volume name. The letter "I" |
| 571 | // is appended to the front to indecate that this |
| 572 | // is an ITS volume. |
| 573 | // TString &dis String containging part discription. |
| 574 | // Double_t rmin Inside Radius. |
| 575 | // Double_t rmax Outside Radius. |
| 576 | // Double_t the1 staring polar angle of the shell [degree]. |
| 577 | // Double_t the2 ending polar angle of the shell [degree]. |
| 578 | // Double_t phui staring asimuthal angle of the shell [degree]. |
| 579 | // Double_t phi2 ending asimuthal angle of the shell [degree]. |
| 580 | // Int_t med media index number. |
| 581 | // Output: |
| 582 | // none. |
| 583 | // Return. |
| 584 | // none. |
| 585 | char name[4]; |
| 586 | Float_t param[6]; |
| 587 | |
| 588 | if(fidmed==0) SetMedArray(); |
| 589 | param[0] = fScale*rmin; |
| 590 | param[1] = fScale*rmax; |
| 591 | param[2] = the1; |
| 592 | param[3] = the2; |
| 593 | param[4] = phi1; |
| 594 | param[5] = phi2; |
| 595 | name[3] = 'I'; |
| 596 | for(Int_t i=0;i<3;i++) name[i+1] = gnam[i]; |
| 597 | gMC->Gsvolu(name,"SPHE",fidmed[med],param,6); |
| 598 | } |
| 599 | //______________________________________________________________________ |
| 600 | void AliITSBaseGeometry::Parallelepiped(const char gnam[3],const TString &dis, |
| 601 | Double_t dx,Double_t dy,Double_t dz, |
| 602 | Double_t alpha,Double_t thet, |
| 603 | Double_t phi,Int_t med){ |
| 604 | // Interface to TMC->Gsvolu() for ITS PARA geometries. Parallelepiped. It |
| 605 | // has 6 parameters. See SetScale() for units. Default units are geant 3 |
| 606 | // [cm]. |
| 607 | // Inputs: |
| 608 | // const char gnam[3] 3 character geant volume name. The letter "I" |
| 609 | // is appended to the front to indecate that this |
| 610 | // is an ITS volume. |
| 611 | // TString &dis String containging part discription. |
| 612 | // Double_t dx half-length allong x-axis |
| 613 | // Double_t dy half-length allong y-axis |
| 614 | // Double_t dz half-length allong z-axis |
| 615 | // Double_t alpha angle formed by the y axis and by the plane |
| 616 | // joining the center of teh faces parallel to the |
| 617 | // z-x plane at -dY and +dy [degree]. |
| 618 | // Double_t thet polar angle of the line joining the centers of |
| 619 | // the faces at -dz and +dz in z [degree]. |
| 620 | // Double_t phi azimuthal angle of teh line joing the centers of |
| 621 | // the faaces at -dz and +dz in z [degree]. |
| 622 | // Int_t med media index number. |
| 623 | // Output: |
| 624 | // none. |
| 625 | // Return. |
| 626 | // none. |
| 627 | char name[4]; |
| 628 | Float_t param[6]; |
| 629 | |
| 630 | if(fidmed==0) SetMedArray(); |
| 631 | param[0] = fScale*dx; |
| 632 | param[1] = fScale*dy; |
| 633 | param[2] = fScale*dz; |
| 634 | param[3] = alpha; |
| 635 | param[4] = thet; |
| 636 | param[5] = phi; |
| 637 | name[3] = 'I'; |
| 638 | for(Int_t i=0;i<3;i++) name[i+1] = gnam[i]; |
| 639 | gMC->Gsvolu(name,"PARA",fidmed[med],param,6); |
| 640 | } |
| 641 | //______________________________________________________________________ |
| 642 | void AliITSBaseGeometry::Polygon(const char gnam[3],const TString &dis, |
| 643 | Double_t phi1,Double_t dphi,Int_t npdv, |
| 644 | Int_t nz,Double_t *z,Double_t *rmin, |
| 645 | Double_t *rmax,Int_t med){ |
| 646 | // Interface to TMC->Gsvolu() for ITS PGON geometry. Polygon It has 10 |
| 647 | // parameters or more. See SetScale() for units. Default units are geant 3 |
| 648 | // [cm]. |
| 649 | // Inputs: |
| 650 | // const char gnam[3] 3 character geant volume name. The letter "I" |
| 651 | // is appended to the front to indecate that this |
| 652 | // is an ITS volume. |
| 653 | // TString &dis String containging part discription. |
| 654 | // Double_t phi1 the azimuthal angle at which the volume begins |
| 655 | // (angles are counted clouterclockwise) [degrees]. |
| 656 | // Double_t dphi opening angle of the volume, which extends from |
| 657 | // phi1 to phi1+dphi [degree]. |
| 658 | // Int_t npdv the number of sides of teh cross section between |
| 659 | // the given phi limits. |
| 660 | // Int_t nz number of planes perpendicular to the z axis |
| 661 | // where the dimension of the section is given - |
| 662 | // this number should be at least 2 and NP triples |
| 663 | // of number must follow. |
| 664 | // Double_t *z array [nz] of z coordiates of the sections.. |
| 665 | // Double_t *rmin array [nz] of radius of teh circle tangent to |
| 666 | // the sides of the inner polygon in teh |
| 667 | // cross-section. |
| 668 | // Double_t *rmax array [nz] of radius of the circle tangent to |
| 669 | // the sides of the outer polygon in the |
| 670 | // cross-section. |
| 671 | // Int_t med media index number. |
| 672 | // Output: |
| 673 | // none. |
| 674 | // Return. |
| 675 | // none. |
| 676 | char name[4]; |
| 677 | Float_t *param; |
| 678 | Int_t n,i; |
| 679 | |
| 680 | if(fidmed==0) SetMedArray(); |
| 681 | n = 4+3*nz; |
| 682 | param = new Float_t[n]; |
| 683 | param[0] = phi1; |
| 684 | param[1] = dphi; |
| 685 | param[2] = (Float_t)npdv; |
| 686 | param[3] = (Float_t)nz; |
| 687 | for(i=0;i<nz;i++){ |
| 688 | param[4+3*i] = z[i]; |
| 689 | param[5+3*i] = rmin[i]; |
| 690 | param[6+3*i] = rmax[i]; |
| 691 | } // end for i |
| 692 | name[3] = 'I'; |
| 693 | for(i=0;i<3;i++) name[i+1] = gnam[i]; |
| 694 | gMC->Gsvolu(name,"PGON",fidmed[med],param,n); |
| 695 | |
| 696 | delete[] param; |
| 697 | } |
| 698 | //______________________________________________________________________ |
| 699 | void AliITSBaseGeometry::PolyCone(const char gnam[3],const TString &dis, |
| 700 | Double_t phi1,Double_t dphi,Int_t nz, |
| 701 | Double_t *z,Double_t *rmin,Double_t *rmax, |
| 702 | Int_t med){ |
| 703 | // Interface to TMC->Gsvolu() for ITS PCON geometry. Poly-cone It has 9 |
| 704 | // parameters or more. See SetScale() for units. Default units are geant 3 |
| 705 | // [cm]. |
| 706 | // Inputs: |
| 707 | // const char gnam[3] 3 character geant volume name. The letter "I" |
| 708 | // is appended to the front to indecate that this |
| 709 | // is an ITS volume. |
| 710 | // TString &dis String containging part discription. |
| 711 | // Double_t phi1 the azimuthal angle at which the volume begins |
| 712 | // (angles are counted clouterclockwise) [degrees]. |
| 713 | // Double_t dphi opening angle of the volume, which extends from |
| 714 | // phi1 to phi1+dphi [degree]. |
| 715 | // Int_t nz number of planes perpendicular to the z axis |
| 716 | // where the dimension of the section is given - |
| 717 | // this number should be at least 2 and NP triples |
| 718 | // of number must follow. |
| 719 | // Double_t *z Array [nz] of z coordinate of the section. |
| 720 | // Double_t *rmin Array [nz] of radius of teh inner circle in the |
| 721 | // cross-section. |
| 722 | // Double_t *rmax Array [nz] of radius of the outer circle in the |
| 723 | // cross-section. |
| 724 | // Int_t med media index number. |
| 725 | // Output: |
| 726 | // none. |
| 727 | // Return. |
| 728 | // none. |
| 729 | char name[4]; |
| 730 | Float_t *param; |
| 731 | Int_t n,i; |
| 732 | |
| 733 | if(fidmed==0) SetMedArray(); |
| 734 | n = 3+3*nz; |
| 735 | param = new Float_t[n]; |
| 736 | param[0] = phi1; |
| 737 | param[1] = dphi; |
| 738 | param[2] = (Float_t) nz; |
| 739 | for(i=0;i<nz;i++){ |
| 740 | param[3+3*i] = z[i]; |
| 741 | param[4+3*i] = rmin[i]; |
| 742 | param[5+3*i] = rmax[i]; |
| 743 | } // end for i |
| 744 | name[3] = 'I'; |
| 745 | for(i=0;i<3;i++) name[i+1] = gnam[i]; |
| 746 | gMC->Gsvolu(name,"PCON",fidmed[med],param,n); |
| 747 | |
| 748 | delete[] param; |
| 749 | } |
| 750 | //______________________________________________________________________ |
| 751 | void AliITSBaseGeometry::TubeElliptical(const char gnam[3],const TString &dis, |
| 752 | Double_t p1,Double_t p2,Double_t dz,Int_t med){ |
| 753 | // Interface to TMC->Gsvolu() for ITS ELTU geometries. Elliptical |
| 754 | // cross-section Tube. It has 3 parameters. See SetScale() |
| 755 | // for units. Default units are geant 3 [cm]. The equation of the surface |
| 756 | // is x^2 * p1^-2 + y^2 * p2^-2 = 1. |
| 757 | // Inputs: |
| 758 | // const char gnam[3] 3 character geant volume name. The letter "I" |
| 759 | // is appended to the front to indecate that this |
| 760 | // is an ITS volume. |
| 761 | // TString &dis String containging part discription. |
| 762 | // Double_t p1 semi-axis of the elipse along x. |
| 763 | // Double_t p2 semi-axis of the elipse along y. |
| 764 | // Double_t dz half-length along the z-axis |
| 765 | // Int_t med media index number. |
| 766 | // Output: |
| 767 | // none. |
| 768 | // Return. |
| 769 | // none. |
| 770 | char name[4]; |
| 771 | Float_t param[3]; |
| 772 | |
| 773 | if(fidmed==0) SetMedArray(); |
| 774 | param[0] = fScale*p1; |
| 775 | param[1] = fScale*p2; |
| 776 | param[2] = fScale*dz; |
| 777 | name[3] = 'I'; |
| 778 | for(Int_t i=0;i<3;i++) name[i+1] = gnam[i]; |
| 779 | gMC->Gsvolu(name,"ELTU",fidmed[med],param,3); |
| 780 | } |
| 781 | //______________________________________________________________________ |
| 782 | void AliITSBaseGeometry::HyperbolicTube(const char gnam[3],const TString &dis, |
| 783 | Double_t rmin,Double_t rmax,Double_t dz, |
| 784 | Double_t thet,Int_t med){ |
| 785 | // Interface to TMC->Gsvolu() for ITS HYPE geometries. Hyperbolic tube. |
| 786 | // Fore example the inner and outer surfaces are hyperboloids, as would be |
| 787 | // foumed by a system of cylinderical wires which were then rotated |
| 788 | // tangentially about their centers. It has 4 parameters. See SetScale() |
| 789 | // for units. Default units are geant 3 [cm]. The hyperbolic surfaces are |
| 790 | // given by r^2 = (ztan(thet)^2 + r(z=0)^2. |
| 791 | // Inputs: |
| 792 | // const char gnam[3] 3 character geant volume name. The letter "I" |
| 793 | // is appended to the front to indecate that this |
| 794 | // is an ITS volume. |
| 795 | // TString &dis String containging part discription. |
| 796 | // Double_t rmin Inner radius at z=0 where tube is narrowest. |
| 797 | // Double_t rmax Outer radius at z=0 where tube is narrowest. |
| 798 | // Double_t dz half-length along the z-axis |
| 799 | // Double_t thet stero angel of rotation of the two faces |
| 800 | // [degrees]. |
| 801 | // Int_t med media index number. |
| 802 | // Output: |
| 803 | // none. |
| 804 | // Return. |
| 805 | // none. |
| 806 | char name[4]; |
| 807 | Float_t param[4]; |
| 808 | |
| 809 | if(fidmed==0) SetMedArray(); |
| 810 | param[0] = fScale*rmin; |
| 811 | param[1] = fScale*rmax; |
| 812 | param[2] = fScale*dz; |
| 813 | param[3] = thet; |
| 814 | name[3] = 'I'; |
| 815 | for(Int_t i=0;i<3;i++) name[i+1] = gnam[i]; |
| 816 | gMC->Gsvolu(name,"HYPE",fidmed[med],param,4); |
| 817 | } |
| 818 | //______________________________________________________________________ |
| 819 | void AliITSBaseGeometry::TwistedTrapezoid(const char gnam[3], |
| 820 | const TString &dis, |
| 821 | Double_t dz,Double_t thet,Double_t phi, |
| 822 | Double_t twist,Double_t h1,Double_t bl1, |
| 823 | Double_t tl1,Double_t apl1,Double_t h2, |
| 824 | Double_t bl2,Double_t tl2,Double_t apl2, |
| 825 | Int_t med){ |
| 826 | // Interface to TMC->Gsvolu() for ITS GTRA geometries. General twisted |
| 827 | // trapazoid. The faces perpendicular to z are trapazia and their centers |
| 828 | // are not necessarily on a line parallel to the z axis as the TRAP. |
| 829 | // Additionally, the faces may be twisted so that none of their edges are |
| 830 | // parallel. It is a TRAP shape, exept that it is twisted in the x-y plane |
| 831 | // as a function of z. The parallel sides perpendicular to the x axis are |
| 832 | // rotated with respect to the x axis by an angle TWIST, which is one of |
| 833 | // the parameters. The shape is defined by the eight corners and is assumed |
| 834 | // to be constructed of straight lines joingin points on the boundry of the |
| 835 | // trapezoidal face at Z=-dz to the coresponding points on the face at |
| 836 | // z=+dz. Divisions are not allowed. It has 12 parameters. See SetScale() |
| 837 | // for units. Default units are geant 3 [cm]. Note: This shape suffers from |
| 838 | // the same limitations than the TRAP. The tracking routines assume that |
| 839 | // the faces are planar, but htis constraint is not easily expressed in |
| 840 | // terms of the 12 parameters. Additionally, no check on th efaces is |
| 841 | // performed in this case. Users should avoid to use this shape as much as |
| 842 | // possible, and if they have to do so, they should make sure that the |
| 843 | // faces are really planes. If this is not the case, the result of the |
| 844 | // trasport is unpredictable. To accelerat ethe computations necessary for |
| 845 | // trasport, 18 additioanl parameters are calculated for this shape are |
| 846 | // 1 DXODZ dx/dz of the line joing the centers of the faces at z=+_dz. |
| 847 | // 2 DYODZ dy/dz of the line joing the centers of the faces at z=+_dz. |
| 848 | // 3 XO1 x at z=0 for line joing the + on parallel side, perpendicular |
| 849 | // corners at z=+_dz. |
| 850 | // 4 YO1 y at z=0 for line joing the + on parallel side, + on |
| 851 | // perpendicular corners at z=+-dz. |
| 852 | // 5 DXDZ1 dx/dz for line joing the + on parallel side, + on |
| 853 | // perpendicular corners at z=+-dz. |
| 854 | // 6 DYDZ1 dy/dz for line joing the + on parallel side, + on |
| 855 | // perpendicular corners at z=+-dz. |
| 856 | // 7 X02 x at z=0 for line joing the - on parallel side, + on |
| 857 | // perpendicular corners at z=+-dz. |
| 858 | // 8 YO2 y at z=0 for line joing the - on parallel side, + on |
| 859 | // perpendicular corners at z=+-dz. |
| 860 | // 9 DXDZ2 dx/dz for line joing the - on parallel side, + on |
| 861 | // perpendicular corners at z=+-dz. |
| 862 | // 10 DYDZ2dy/dz for line joing the - on parallel side, + on |
| 863 | // perpendicular corners at z=+-dz. |
| 864 | // 11 XO3 x at z=0 for line joing the - on parallel side, - on |
| 865 | // perpendicular corners at z=+-dz. |
| 866 | // 12 YO3 y at z=0 for line joing the - on parallel side, - on |
| 867 | // perpendicular corners at z=+-dz. |
| 868 | // 13 DXDZ3 dx/dzfor line joing the - on parallel side, - on |
| 869 | // perpendicular corners at z=+-dz. |
| 870 | // 14 DYDZ3 dydz for line joing the - on parallel side, - on |
| 871 | // perpendicular corners at z=+-dz. |
| 872 | // 15 XO4 x at z=0 for line joing the + on parallel side, - on |
| 873 | // perpendicular corners at z=+-dz. |
| 874 | // 16 YO4 y at z=0 for line joing the + on parallel side, - on |
| 875 | // perpendicular corners at z=+-dz. |
| 876 | // 17 DXDZ4 dx/dz for line joing the + on parallel side, - on |
| 877 | // perpendicular corners at z=+-dz. |
| 878 | // 18 DYDZ4 dydz for line joing the + on parallel side, - on |
| 879 | // perpendicular corners at z=+-dz. |
| 880 | // Inputs: |
| 881 | // const char gnam[3] 3 character geant volume name. The letter "I" |
| 882 | // is appended to the front to indecate that this |
| 883 | // is an ITS volume. |
| 884 | // TString &dis String containging part discription. |
| 885 | // Double_t dz half-length along the z axis. |
| 886 | // Double_t thet polar angle of the line joing the center of the |
| 887 | // face at -dz to the center of the one at +dz |
| 888 | // [degrees]. |
| 889 | // Double_t phi Azymuthal angle of teh line joing the centre of |
| 890 | // the face at -dz to the center of the one at +dz |
| 891 | // [degrees]. |
| 892 | // Double_t twist Twist angle of the faces parallel to the x-y |
| 893 | // plane at z=+-dz around an axis parallel to z |
| 894 | // passing through their centre [degrees]. |
| 895 | // Double_t h1 Half-length along y of the face at -dz. |
| 896 | // Double_t bl1 half-length along x of the side -h1 in y of the |
| 897 | // face at -dz in z. |
| 898 | // Double_t tl1 half-length along x of the side at +h1 in y of |
| 899 | // the face at -dz in z. |
| 900 | // Double_t apl1 Angle with respect to the y ais from the center |
| 901 | // of the side at -h1 in y to the centere of the |
| 902 | // side at +h1 in y of the face at -dz in z |
| 903 | // [degrees]. |
| 904 | // Double_t h2 half-length along the face at +dz. |
| 905 | // Double_t bl2 half-length along x of the side at -h2 in y of |
| 906 | // the face at -dz in z. |
| 907 | // Double_t tl2 half-length along x of the side at +h2 in y of |
| 908 | // the face at +dz in z. |
| 909 | // Double_t apl2 angle with respect to the y axis from the center |
| 910 | // of the side at -h2 in y to the center of the side |
| 911 | // at +h2 in y of the face at +dz in z [degrees]. |
| 912 | // Int_t med media index number. |
| 913 | // Output: |
| 914 | // none. |
| 915 | // Return. |
| 916 | // none. |
| 917 | char name[4]; |
| 918 | Float_t param[12]; |
| 919 | |
| 920 | if(fidmed==0) SetMedArray(); |
| 921 | param[0] = fScale*dz; |
| 922 | param[1] = thet; |
| 923 | param[2] = phi; |
| 924 | param[3] = twist; |
| 925 | param[4] = fScale*h1; |
| 926 | param[5] = fScale*bl1; |
| 927 | param[6] = fScale*tl1; |
| 928 | param[7] = apl1; |
| 929 | param[8] = fScale*h2; |
| 930 | param[9] = fScale*bl2; |
| 931 | param[10] = fScale*tl2; |
| 932 | param[11] = apl2; |
| 933 | name[3] = 'I'; |
| 934 | for(Int_t i=0;i<3;i++) name[i+1] = gnam[i]; |
| 935 | gMC->Gsvolu(name,"GTRA",fidmed[med],param,12); |
| 936 | } |
| 937 | //______________________________________________________________________ |
| 938 | void AliITSBaseGeometry::CutTube(const char gnam[3],const TString &dis, |
| 939 | Double_t rmin,Double_t rmax,Double_t dz, |
| 940 | Double_t phi1,Double_t phi2,Double_t lx, |
| 941 | Double_t ly,Double_t lz,Double_t hx, |
| 942 | Double_t hy,Double_t hz,Int_t med){ |
| 943 | // Interface to TMC->Gsvolu() for ITS CTUB geometries. Cut tube. A tube cut |
| 944 | // at the extremities with planes not necessarily perpendicular tot he z |
| 945 | // axis. It has 11 parameters. See SetScale() for units. Default units are |
| 946 | // geant 3 [cm]. phi1 should be smaller than phi2. If this is not the case, |
| 947 | // the system adds 360 degrees to phi2. |
| 948 | // Inputs: |
| 949 | // const char gnam[3] 3 character geant volume name. The letter "I" |
| 950 | // is appended to the front to indecate that this |
| 951 | // is an ITS volume. |
| 952 | // TString &dis String containging part discription. |
| 953 | // Double_t rmin Inner radius at z=0 where tube is narrowest. |
| 954 | // Double_t rmax Outer radius at z=0 where tube is narrowest. |
| 955 | // Double_t dz half-length along the z-axis |
| 956 | // Double_t dz half-length along the z-axis |
| 957 | // Double_t phi1 Starting angle of the segment [degree]. |
| 958 | // Double_t phi2 Ending angle of the segment [degree]. |
| 959 | // Double_t lx x component of a unit vector perpendicular to |
| 960 | // the face at -dz. |
| 961 | // Double_t ly y component of a unit vector perpendicular to |
| 962 | // the face at -dz. |
| 963 | // Double_t lz z component of a unit vector perpendicular to |
| 964 | // the face at -dz. |
| 965 | // Double_t hx x component of a unit vector perpendicular to |
| 966 | // the face at +dz. |
| 967 | // Double_t hy y component of a unit vector perpendicular to |
| 968 | // the face at +dz. |
| 969 | // Double_t hz z component of a unit vector perpendicular to |
| 970 | // the face at +dz. |
| 971 | // Int_t med media index number. |
| 972 | // Output: |
| 973 | // none. |
| 974 | // Return. |
| 975 | // none. |
| 976 | char name[4]; |
| 977 | Float_t param[11]; |
| 978 | |
| 979 | if(fidmed==0) SetMedArray(); |
| 980 | param[0] = fScale*rmin; |
| 981 | param[1] = fScale*rmax; |
| 982 | param[2] = fScale*dz; |
| 983 | param[3] = phi1; |
| 984 | param[4] = phi2; |
| 985 | param[5] = lx; |
| 986 | param[6] = ly; |
| 987 | param[7] = lz; |
| 988 | param[8] = hx; |
| 989 | param[9] = hy; |
| 990 | param[10] = hz; |
| 991 | name[3] = 'I'; |
| 992 | for(Int_t i=0;i<3;i++) name[i+1] = gnam[i]; |
| 993 | gMC->Gsvolu(name,"CTUB",fidmed[med],param,11); |
| 994 | } |
| 995 | //______________________________________________________________________ |
| 996 | void AliITSBaseGeometry::Pos(const char vol[3],Int_t cn,const char moth[3], |
| 997 | Double_t x,Double_t y,Double_t z,Int_t irot){ |
| 998 | // Place a copy of a volume previously defined by a call to GSVOLU inside |
| 999 | // its mother volulme moth. |
| 1000 | // Inputs: |
| 1001 | // const char vol[3] 3 character geant volume name. The letter "I" |
| 1002 | // is appended to the front to indecate that this |
| 1003 | // is an ITS volume. |
| 1004 | // const char moth[3] 3 character geant volume name of the mother volume |
| 1005 | // in which vol will be placed. The letter "I" is |
| 1006 | // appended to the front to indecate that this is an |
| 1007 | // ITS volume. |
| 1008 | // Double_t x The x positon of the volume in the mother's |
| 1009 | // reference system |
| 1010 | // Double_t y The y positon of the volume in the mother's |
| 1011 | // reference system |
| 1012 | // Double_t z The z positon of the volume in the mother's |
| 1013 | // reference system |
| 1014 | // Int_t irot the index for the rotation matrix to be used. |
| 1015 | // irot=-1 => unit rotation. |
| 1016 | // Outputs: |
| 1017 | // none. |
| 1018 | // Return: |
| 1019 | // none. |
| 1020 | char name[4],mother[4]; |
| 1021 | Float_t param[3]; |
| 1022 | Int_t r=0,i; |
| 1023 | |
| 1024 | param[0] = x; |
| 1025 | param[1] = y; |
| 1026 | param[2] = z; |
| 1027 | name[3] = 'I'; |
| 1028 | for(i=0;i<3;i++) name[i+1] = vol[i]; |
| 1029 | mother[3] = 'I'; |
| 1030 | for(i=0;i<3;i++) mother[i+1] = moth[i]; |
| 1031 | if(irot>=0) r=fidrot[irot]; |
| 1032 | gMC->Gspos(name,1,mother,param[0],param[1],param[2],r,"ONLY"); |
| 1033 | } |
| 1034 | //______________________________________________________________________ |
| 1035 | void AliITSBaseGeometry::Matrix(Int_t irot,Double_t thet1,Double_t phi1, |
| 1036 | Double_t thet2,Double_t phi2, |
| 1037 | Double_t thet3,Double_t phi3){ |
| 1038 | // Defines a Geant rotation matrix. checks to see if it is the unit |
| 1039 | // matrix. If so, then no additonal matrix is defined. Stores rotation |
| 1040 | // matrix irot in the data structure JROTM. If the matrix is not |
| 1041 | // orthonormal, it will be corrected by setting y' perpendicular to x' |
| 1042 | // and z' = x' X y'. A warning message is printed in this case. |
| 1043 | // Inputs: |
| 1044 | // Int_t irot Intex specifing which rotation matrix. |
| 1045 | // Double_t thet1 Polar angle for axisw x [degrees]. |
| 1046 | // Double_t phi1 azimuthal angle for axis x [degrees]. |
| 1047 | // Double_t thet12Polar angle for axisw y [degrees]. |
| 1048 | // Double_t phi2 azimuthal angle for axis y [degrees]. |
| 1049 | // Double_t thet3 Polar angle for axisw z [degrees]. |
| 1050 | // Double_t phi3 azimuthal angle for axis z [degrees]. |
| 1051 | // Outputs: |
| 1052 | // none. |
| 1053 | // Return: |
| 1054 | // none. |
| 1055 | Float_t t1,p1,t2,p2,t3,p3; |
| 1056 | |
| 1057 | if(thet1==90.0&&phi1==0.0&&thet2==90.0&&phi2==90.0&&thet3==0.0&&phi3==0.0){ |
| 1058 | fidrot[irot] = 0; // Unit matrix |
| 1059 | }else{ |
| 1060 | t1 = thet1; |
| 1061 | p1 = phi1; |
| 1062 | t2 = thet2; |
| 1063 | p2 = phi2; |
| 1064 | t3 = thet3; |
| 1065 | p3 = phi3; |
| 1066 | fits->AliMatrix(fidrot[irot],t1,p1,t2,p2,t3,p3); |
| 1067 | } // end if |
| 1068 | } |
| 1069 | //______________________________________________________________________ |
| 1070 | void AliITSBaseGeometry::Matrix(Int_t irot,Int_t axis,Double_t thet){ |
| 1071 | // Defines a Geant rotation matrix. checks to see if it is the unit |
| 1072 | // matrix. If so, then no additonal matrix is defined. Stores rotation |
| 1073 | // matrix irot in the data structure JROTM. If the matrix is not |
| 1074 | // orthonormal, it will be corrected by setting y' perpendicular to x' |
| 1075 | // and z' = x' X y'. A warning message is printed in this case. |
| 1076 | // Inputs: |
| 1077 | // Int_t irot Intex specifing which rotation matrix. |
| 1078 | // Int_t axis Axis about which rotation is to be done. |
| 1079 | // Double_t thet Angle to rotate by [degrees]. |
| 1080 | // Outputs: |
| 1081 | // none. |
| 1082 | // Return: |
| 1083 | // none. |
| 1084 | |
| 1085 | if(thet==0.0){ |
| 1086 | fidrot[irot] = 0; // Unit matrix |
| 1087 | }else{ |
| 1088 | switch (irot) { |
| 1089 | case 0: //Rotate about x-axis, x-axis does not change. |
| 1090 | fits->AliMatrix(fidrot[irot],90.0,0.0,90.0+thet,90.0,thet,90.0); |
| 1091 | break; |
| 1092 | case 1: //Rotate about y-axis, y-axis does not change. |
| 1093 | fits->AliMatrix(fidrot[irot],-90.0-thet,0.0,90.0,90.0,thet,90.0); |
| 1094 | break; |
| 1095 | case 2: //Rotate about z-axis, z-axis does not change. |
| 1096 | fits->AliMatrix(fidrot[irot],90.0,thet,90.0,-thet-90.0,0.0,0.0); |
| 1097 | break; |
| 1098 | default: |
| 1099 | Error("Matrix","axis must be either 0, 1, or 2. for matrix=%d", |
| 1100 | irot); |
| 1101 | break; |
| 1102 | } // end switch |
| 1103 | } // end if |
| 1104 | } |
| 1105 | //______________________________________________________________________ |
| 1106 | void AliITSBaseGeometry::Matrix(Int_t irot,Double_t rot[3][3]){ |
| 1107 | // Defines a Geant rotation matrix. checks to see if it is the unit |
| 1108 | // matrix. If so, then no additonal matrix is defined. Stores rotation |
| 1109 | // matrix irot in the data structure JROTM. If the matrix is not |
| 1110 | // orthonormal, it will be corrected by setting y' perpendicular to x' |
| 1111 | // and z' = x' X y'. A warning message is printed in this case. |
| 1112 | // Inputs: |
| 1113 | // Int_t irot Intex specifing which rotation matrix. |
| 1114 | // Double_t rot[3][3] The 3 by 3 rotation matrix. |
| 1115 | // Outputs: |
| 1116 | // none. |
| 1117 | // Return: |
| 1118 | // none. |
| 1119 | |
| 1120 | if(rot[0][0]==1.0&&rot[1][1]==1.0&&rot[2][2]==1.0&& |
| 1121 | rot[0][1]==0.0&&rot[0][2]==0.0&&rot[1][0]==0.0&& |
| 1122 | rot[1][2]==0.0&&rot[2][0]==0.0&&rot[2][1]==0.0){ |
| 1123 | fidrot[irot] = 0; // Unit matrix |
| 1124 | }else{ |
| 1125 | Double_t si,c=180./TMath::Pi(); |
| 1126 | Double_t ang[6]; |
| 1127 | |
| 1128 | ang[1] = TMath::ATan2(rot[0][1],rot[0][0]); |
| 1129 | if(TMath::Cos(ang[1])!=0.0) si = rot[0][0]/TMath::Cos(ang[1]); |
| 1130 | else si = rot[0][1]/TMath::Sin(ang[1]); |
| 1131 | ang[0] = TMath::ATan2(si,rot[0][2]); |
| 1132 | |
| 1133 | ang[3] = TMath::ATan2(rot[1][1],rot[1][0]); |
| 1134 | if(TMath::Cos(ang[3])!=0.0) si = rot[1][0]/TMath::Cos(ang[3]); |
| 1135 | else si = rot[1][1]/TMath::Sin(ang[3]); |
| 1136 | ang[2] = TMath::ATan2(si,rot[1][2]); |
| 1137 | |
| 1138 | ang[5] = TMath::ATan2(rot[2][1],rot[2][0]); |
| 1139 | if(TMath::Cos(ang[5])!=0.0) si = rot[2][0]/TMath::Cos(ang[5]); |
| 1140 | else si = rot[2][1]/TMath::Sin(ang[5]); |
| 1141 | ang[4] = TMath::ATan2(si,rot[2][2]); |
| 1142 | |
| 1143 | for(Int_t i=0;i<6;i++) {ang[i] *= c; if(ang[i]<0.0) ang[i] += 360.;} |
| 1144 | fits->AliMatrix(fidrot[irot],ang[0],ang[1],ang[2],ang[3], |
| 1145 | ang[4],ang[5]); |
| 1146 | } // end if |
| 1147 | } |
| 1148 | //______________________________________________________________________ |
| 1149 | Float_t AliITSBaseGeometry::GetA(Int_t z){ |
| 1150 | // Returns the isotopicaly averaged atomic number. |
| 1151 | // Inputs: |
| 1152 | // Int_t z Elemental number |
| 1153 | // Outputs: |
| 1154 | // none. |
| 1155 | // Return: |
| 1156 | // The atomic mass number. |
| 1157 | const Float_t A[]={ 1.00794 , 4.0026902, 6.941 , 9.012182 , 10.811 , |
| 1158 | 12.01007 , 14.00674 , 15.9994 , 18.9984032, 20.1797 , |
| 1159 | 22.98970 , 24.3050 , 26.981538, 28.0855 , 30.973761, |
| 1160 | 32.066 , 35.4527 , 39.948 , 39.0983 , 40.078 , |
| 1161 | 44.95591 , 47.867 , 50.9415 , 51.9961 , 54.938049, |
| 1162 | 55.845 , 58.933200 , 58.6934 , 63.546 , 65.39 , |
| 1163 | 69.723 , 72.61 , 74.92160 , 78.96 , 79.904 , |
| 1164 | 83.80 , 85.4678 , 87.62 , 88.9085 , 91.224 , |
| 1165 | 92.90638 , 95.94 , 97.907215, 101.07 ,102.90550 , |
| 1166 | 106.42 ,107.8682 ,112.411 ,114.818 ,118.710 , |
| 1167 | 121.760 ,127.60 ,126.90447 ,131.29 ,132.90545 , |
| 1168 | 137.327 ,138.9055 ,140.116 ,140.90765 ,144.24 , |
| 1169 | 144.912746,150.36 ,151.964 ,157.25 ,158.92534 , |
| 1170 | 162.50 ,164.93032 ,167.26 ,168.93421 ,173.04 , |
| 1171 | 174.967 ,178.49 ,180.9479 ,183.84 ,186.207 , |
| 1172 | 190.23 ,192.217 ,195.078 ,196.96655 ,200.59 , |
| 1173 | 204.3833 ,207.2 ,208.98038,208.982415 ,209.987131, |
| 1174 | 222.017570,223.019731 ,226.025402,227.027747 ,232.0381 , |
| 1175 | 231.03588 ,238.0289}; |
| 1176 | |
| 1177 | if(z<1||z>92){ |
| 1178 | Error("GetA","z must be 0<z<93. z=%d",z); |
| 1179 | return 0.0; |
| 1180 | } // end if |
| 1181 | return A[z-1]; |
| 1182 | } |
| 1183 | //______________________________________________________________________ |
| 1184 | Float_t AliITSBaseGeometry::GetStandardMaxStepSize(Int_t istd){ |
| 1185 | // Returns one of a set of standard Maximum Step Size values. |
| 1186 | // Inputs: |
| 1187 | // Int_t istd Index to indecate which standard. |
| 1188 | // Outputs: |
| 1189 | // none. |
| 1190 | // Return: |
| 1191 | // The appropreate standard Maximum Step Size value [cm]. |
| 1192 | Float_t t[]={1.0, // default |
| 1193 | 0.0075, // Silicon detectors... |
| 1194 | 1.0, // Air in central detectors region |
| 1195 | 1.0 // Material in non-centeral region |
| 1196 | }; |
| 1197 | return t[istd]; |
| 1198 | } |
| 1199 | //______________________________________________________________________ |
| 1200 | Float_t AliITSBaseGeometry::GetStandardThetaMax(Int_t istd){ |
| 1201 | // Returns one of a set of standard Theata Max values. |
| 1202 | // Inputs: |
| 1203 | // Int_t istd Index to indecate which standard. |
| 1204 | // Outputs: |
| 1205 | // none. |
| 1206 | // Return: |
| 1207 | // The appropreate standard Theta max value [degrees]. |
| 1208 | Float_t t[]={0.1, // default |
| 1209 | 0.1, // Silicon detectors... |
| 1210 | 0.1, // Air in central detectors region |
| 1211 | 1.0 // Material in non-centeral region |
| 1212 | }; |
| 1213 | return t[istd]; |
| 1214 | } |
| 1215 | //______________________________________________________________________ |
| 1216 | Float_t AliITSBaseGeometry::GetStandardEfraction(Int_t istd){ |
| 1217 | // Returns one of a set of standard E fraction values. |
| 1218 | // Inputs: |
| 1219 | // Int_t istd Index to indecate which standard. |
| 1220 | // Outputs: |
| 1221 | // none. |
| 1222 | // Return: |
| 1223 | // The appropreate standard E fraction value [#]. |
| 1224 | Float_t t[]={0.1, // default |
| 1225 | 0.1, // Silicon detectors... |
| 1226 | 0.1, // Air in central detectors region |
| 1227 | 0.5 // Material in non-centeral region |
| 1228 | }; |
| 1229 | return t[istd]; |
| 1230 | } |
| 1231 | Float_t AliITSBaseGeometry::GetStandardEpsilon(Int_t istd){ |
| 1232 | // Returns one of the standard Epsilon valuse |
| 1233 | // Inputs: |
| 1234 | // Int_t istd index of standard cuts to get |
| 1235 | // Output: |
| 1236 | // none. |
| 1237 | // Return: |
| 1238 | // Float_t the standard Epsilon cut value. |
| 1239 | Float_t t[]={1.0E-4, // default |
| 1240 | 1.0E-4, // Silicon detectors... |
| 1241 | 1.0E-4, // Air in central detector region |
| 1242 | 1.0E-3, // Material in non-cneteral regions |
| 1243 | }; |
| 1244 | |
| 1245 | return t[istd]; |
| 1246 | } |
| 1247 | //______________________________________________________________________ |
| 1248 | void AliITSBaseGeometry::Element(Int_t imat,const char* name,Int_t z, |
| 1249 | Double_t dens,Int_t istd){ |
| 1250 | // Defines a Geant single element material and sets its Geant medium |
| 1251 | // proporties. The average atomic A is assumed to be given by their |
| 1252 | // natural abundances. Things like the radiation length are calculated |
| 1253 | // for you. |
| 1254 | // Inputs: |
| 1255 | // Int_t imat Material number. |
| 1256 | // const char* name Material name. No need to add a $ at the end. |
| 1257 | // Int_t z The elemental number. |
| 1258 | // Double_t dens The density of the material [g/cm^3]. |
| 1259 | // Int_t istd Defines which standard set of transport parameters |
| 1260 | // which should be used. |
| 1261 | // Output: |
| 1262 | // none. |
| 1263 | // Return: |
| 1264 | // none. |
| 1265 | Float_t rad,Z,A=GetA(z),tmax,stemax,deemax,epsilon; |
| 1266 | char *name2; |
| 1267 | Int_t len; |
| 1268 | |
| 1269 | len = strlen(name)+1; |
| 1270 | name2 = new char[len]; |
| 1271 | strncpy(name2,name,len-1); |
| 1272 | name2[len-1] = '\0'; |
| 1273 | name2[len-2] = '$'; |
| 1274 | Z = (Float_t)z; |
| 1275 | rad = GetRadLength(z)/dens; |
| 1276 | fits->AliMaterial(imat,name2,A,Z,dens,rad,0.0,0,0); |
| 1277 | tmax = GetStandardThetaMax(istd); // degree |
| 1278 | stemax = GetStandardMaxStepSize(istd); // cm |
| 1279 | deemax = GetStandardEfraction(istd); // ratio |
| 1280 | epsilon = GetStandardEpsilon(istd); // |
| 1281 | fits->AliMedium(imat,name2,imat,0,gAlice->Field()->Integ(), |
| 1282 | gAlice->Field()->Max(),tmax,stemax,deemax,epsilon,0.0); |
| 1283 | delete[] name2; |
| 1284 | } |
| 1285 | //______________________________________________________________________ |
| 1286 | void AliITSBaseGeometry::MixtureByWeight(Int_t imat,const char* name,Int_t *z, |
| 1287 | Double_t *w,Double_t dens,Int_t n,Int_t istd){ |
| 1288 | // Defines a Geant material by a set of elements and weights, and sets |
| 1289 | // its Geant medium proporties. The average atomic A is assumed to be |
| 1290 | // given by their natural abundances. Things like the radiation length |
| 1291 | // are calculated for you. |
| 1292 | // Inputs: |
| 1293 | // Int_t imat Material number. |
| 1294 | // const char* name Material name. No need to add a $ at the end. |
| 1295 | // Int_t *z Array of The elemental numbers. |
| 1296 | // Double_t *w Array of relative weights. |
| 1297 | // Double_t dens The density of the material [g/cm^3]. |
| 1298 | // Int_t n the number of elements making up the mixture. |
| 1299 | // Int_t istd Defines which standard set of transport parameters |
| 1300 | // which should be used. |
| 1301 | // Output: |
| 1302 | // none. |
| 1303 | // Return: |
| 1304 | // none. |
| 1305 | Float_t *Z,*A,*W,tmax,stemax,deemax,epsilon; |
| 1306 | char *name2; |
| 1307 | Int_t len,i; |
| 1308 | Z = new Float_t[n]; |
| 1309 | A = new Float_t[n]; |
| 1310 | W = new Float_t[n]; |
| 1311 | |
| 1312 | len = strlen(name)+1; |
| 1313 | name2 = new char[len]; |
| 1314 | strncpy(name2,name,len-1); |
| 1315 | name2[len-1] = '\0'; |
| 1316 | name2[len-2] = '$'; |
| 1317 | for(i=0;i<n;i++){Z[i] = (Float_t)z[i];A[i] = (Float_t)GetA(z[i]); |
| 1318 | W[i] = (Float_t)w[i];} |
| 1319 | fits->AliMixture(imat,name2,A,Z,dens,n,W); |
| 1320 | tmax = GetStandardThetaMax(istd); // degree |
| 1321 | stemax = GetStandardMaxStepSize(istd); // cm |
| 1322 | deemax = GetStandardEfraction(istd); // # |
| 1323 | epsilon = GetStandardEpsilon(istd); |
| 1324 | fits->AliMedium(imat,name2,imat,0,gAlice->Field()->Integ(), |
| 1325 | gAlice->Field()->Max(),tmax,stemax,deemax,epsilon,0.0); |
| 1326 | delete[] name2; |
| 1327 | delete[] Z; |
| 1328 | delete[] A; |
| 1329 | delete[] W; |
| 1330 | } |
| 1331 | //______________________________________________________________________ |
| 1332 | void AliITSBaseGeometry::MixtureByNumber(Int_t imat,const char* name,Int_t *z, |
| 1333 | Int_t *w,Double_t dens,Int_t n,Int_t istd){ |
| 1334 | // Defines a Geant material by a set of elements and number, and sets |
| 1335 | // its Geant medium proporties. The average atomic A is assumed to be |
| 1336 | // given by their natural abundances. Things like the radiation length |
| 1337 | // are calculated for you. |
| 1338 | // Inputs: |
| 1339 | // Int_t imat Material number. |
| 1340 | // const char* name Material name. No need to add a $ at the end. |
| 1341 | // Int_t *z Array of The elemental numbers. |
| 1342 | // Int_t_t *w Array of relative number. |
| 1343 | // Double_t dens The density of the material [g/cm^3]. |
| 1344 | // Int_t n the number of elements making up the mixture. |
| 1345 | // Int_t istd Defines which standard set of transport parameters |
| 1346 | // which should be used. |
| 1347 | // Output: |
| 1348 | // none. |
| 1349 | // Return: |
| 1350 | // none. |
| 1351 | Float_t *Z,*A,*W,tmax,stemax,deemax,epsilon; |
| 1352 | char *name2; |
| 1353 | Int_t len,i; |
| 1354 | Z = new Float_t[n]; |
| 1355 | A = new Float_t[n]; |
| 1356 | W = new Float_t[n]; |
| 1357 | |
| 1358 | len = strlen(name)+1; |
| 1359 | name2 = new char[len]; |
| 1360 | strncpy(name2,name,len-1); |
| 1361 | name2[len-1] = '\0'; |
| 1362 | name2[len-2] = '$'; |
| 1363 | for(i=0;i<n;i++){Z[i] = (Float_t)z[i];A[i] = (Float_t)GetA(z[i]); |
| 1364 | W[i] = (Float_t)w[i];} |
| 1365 | fits->AliMixture(imat,name2,A,Z,dens,-n,W); |
| 1366 | tmax = GetStandardThetaMax(istd); // degree |
| 1367 | stemax = GetStandardMaxStepSize(istd); // cm |
| 1368 | deemax = GetStandardEfraction(istd); // # |
| 1369 | epsilon = GetStandardEpsilon(istd); |
| 1370 | fits->AliMedium(imat,name2,imat,0,gAlice->Field()->Integ(), |
| 1371 | gAlice->Field()->Max(),tmax,stemax,deemax,epsilon,0.0); |
| 1372 | delete[] name2; |
| 1373 | delete[] Z; |
| 1374 | delete[] A; |
| 1375 | delete[] W; |
| 1376 | } |
| 1377 | //______________________________________________________________________ |
| 1378 | Double_t AliITSBaseGeometry::RadLength(Int_t iz,Double_t a){ |
| 1379 | // Computes the radiation length in accordance to the PDG 2000 Section |
| 1380 | // 23.4.1 p. 166. Transladed from the c code of Flavio Tosello. |
| 1381 | // Inputs: |
| 1382 | // Int_t iz The elemental number |
| 1383 | // Dougle_t The elemental average atomic mass number |
| 1384 | // Outputs: |
| 1385 | // Return: |
| 1386 | // Double_t returns the radiation length of the element iz in |
| 1387 | // [gm/cm^2]. |
| 1388 | Double_t z = (Double_t)iz; |
| 1389 | Double_t alphaz = fAlpha*z; |
| 1390 | Double_t alphaz2 = alphaz*alphaz; |
| 1391 | Double_t c0 = +0.20206,c1 = -0.0369,c2 = +0.0083,c3 = -0.0020; |
| 1392 | Double_t z12,z23,l,lp,c; |
| 1393 | |
| 1394 | c = alphaz2*(1./(1.+alphaz2) + c0 + c1*alphaz2 + c2*alphaz2*alphaz2 |
| 1395 | +c3*alphaz2*alphaz2*alphaz2); |
| 1396 | z12 = TMath::Exp(TMath::Log(z)/3.0); |
| 1397 | z23 = z12*z12; |
| 1398 | switch (iz){ |
| 1399 | case 1: //Hydrogen |
| 1400 | l = 5.31; |
| 1401 | lp = 6.144; |
| 1402 | break; |
| 1403 | case 2: //Helium |
| 1404 | l = 4.79; |
| 1405 | lp = 5,621; |
| 1406 | break; |
| 1407 | case 3: //Lithium |
| 1408 | l = 4.74; |
| 1409 | lp = 5.805; |
| 1410 | break; |
| 1411 | case 4: //Berilium |
| 1412 | l = 4.71; |
| 1413 | lp = 5.924; |
| 1414 | break; |
| 1415 | default: //Others |
| 1416 | l = TMath::Log(184.15/z12); |
| 1417 | lp = TMath::Log(1194.0/z23); |
| 1418 | break; |
| 1419 | } // end switch |
| 1420 | Double_t re2,b,r,xz; |
| 1421 | |
| 1422 | re2 = fRe*fRe; |
| 1423 | b = 4.0*fAlpha*re2*fNa/a; |
| 1424 | r = b*z*(z*(l-c)+lp); |
| 1425 | xz = 1.0/r; |
| 1426 | return xz; // [gm/cm^2] |
| 1427 | } |
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