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1 | /////////////////////////////////////////////////////////////////////////////// |
| 2 | // // |
| 3 | // Transition Radiation Detector version 2 -- detailed simulation // |
| 4 | // // |
| 5 | //Begin_Html |
| 6 | /* |
| 7 | <img src="gif/AliTRDv2Class.gif"> |
| 8 | */ |
| 9 | //End_Html |
| 10 | // // |
| 11 | // // |
| 12 | /////////////////////////////////////////////////////////////////////////////// |
| 13 | |
| 14 | #include <TMath.h> |
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15 | #include <TVector.h> |
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16 | |
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17 | #include "AliTRDv2.h" |
| 18 | #include "AliRun.h" |
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19 | #include "AliMC.h" |
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20 | #include "AliConst.h" |
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21 | |
| 22 | ClassImp(AliTRDv2) |
| 23 | |
| 24 | //_____________________________________________________________________________ |
| 25 | AliTRDv2::AliTRDv2(const char *name, const char *title) |
| 26 | :AliTRD(name, title) |
| 27 | { |
| 28 | // |
| 29 | // Standard constructor for Transition Radiation Detector version 2 |
| 30 | // |
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31 | for (Int_t icham = 0; icham < ncham; ++icham) { |
| 32 | fIdSensI[icham] = 0; |
| 33 | fIdSensN[icham] = 0; |
| 34 | fIdSensO[icham] = 0; |
| 35 | } |
| 36 | fDeltaE = NULL; |
| 37 | |
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38 | SetBufferSize(128000); |
| 39 | } |
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40 | |
| 41 | AliTRDv2::~AliTRDv2() |
| 42 | { |
| 43 | if (fDeltaE) delete fDeltaE; |
| 44 | } |
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45 | |
| 46 | //_____________________________________________________________________________ |
| 47 | void AliTRDv2::CreateGeometry() |
| 48 | { |
| 49 | // |
| 50 | // Create geometry for the Transition Radiation Detector version 2 |
| 51 | // This version covers the full azimuth. |
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52 | // --- Author : Christoph Blume (GSI) 20/5/99 |
| 53 | // |
| 54 | // --- Volume names : |
| 55 | // TRD --> Mother TRD volume (Al) |
| 56 | // UTRS --> Sectors of the sub-detector (Al) |
| 57 | // UTRI --> Inner part of the detector frame (Air) |
| 58 | // The chambers |
| 59 | // UCI1-6 --> The frame of the inner chambers (C) |
| 60 | // UCN1-6 --> The frame of the neighbouring chambers (C) |
| 61 | // UCO1-6 --> The frame of the outer chambers (C) |
| 62 | // UII1-6 --> The inner part of the inner chambers (Air) |
| 63 | // UIN1-6 --> The inner part of the neighbouring chambers (Air) |
| 64 | // UIO1-6 --> The inner part of the outer chambers (Air) |
| 65 | // The layers inside a chamber |
| 66 | // UT0I(N,O) --> Radiator seal (G10) |
| 67 | // UT1I(N,O) --> Radiator (CO2) |
| 68 | // UT2I(N,O) --> Polyethylene of radiator (PE) |
| 69 | // UT3I(N,O) --> Entrance window (Mylar) |
| 70 | // UXI(N,O)1-6 --> Gas volume (sensitive) (Xe/Isobutane) |
| 71 | // UT5I(N,O) --> Pad plane (Cu) |
| 72 | // UT6I(N,O) --> Support structure (G10) |
| 73 | // UT7I(N,O) --> FEE + signal lines (Cu) |
| 74 | // UT8I(N,O) --> Polyethylene of cooling device (PE) |
| 75 | // UT9I(N,O) --> Cooling water (Water) |
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76 | // |
| 77 | //Begin_Html |
| 78 | /* |
| 79 | <img src="gif/AliTRDv2.gif"> |
| 80 | */ |
| 81 | //End_Html |
| 82 | //Begin_Html |
| 83 | /* |
| 84 | <img src="gif/AliTRDv2Tree.gif"> |
| 85 | */ |
| 86 | //End_Html |
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87 | |
| 88 | Float_t xpos, ypos, zpos; |
| 89 | Int_t idmat[2]; |
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90 | |
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91 | const Int_t nparmo = 10; |
| 92 | const Int_t nparfr = 4; |
| 93 | const Int_t nparch = 3; |
| 94 | const Int_t nparic = 4; |
| 95 | const Int_t nparnc = 4; |
| 96 | const Int_t nparoc = 11; |
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97 | |
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98 | Float_t par_mo[nparmo]; |
| 99 | Float_t par_fr[nparfr]; |
| 100 | Float_t par_ch[nparch]; |
| 101 | Float_t par_ic[nparic]; |
| 102 | Float_t par_nc[nparnc]; |
| 103 | Float_t par_oc[nparoc]; |
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104 | |
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105 | Int_t *idtmed = gAlice->Idtmed(); |
| 106 | |
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107 | AliMC* pMC = AliMC::GetMC(); |
| 108 | |
| 109 | ////////////////////////////////////////////////////////////////////////// |
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110 | // Definition of Volumes |
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111 | ////////////////////////////////////////////////////////////////////////// |
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112 | |
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113 | // Definition of the mother volume for the TRD (Al) |
| 114 | par_mo[0] = 0.; |
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115 | par_mo[1] = 360.; |
| 116 | par_mo[2] = nsect; |
| 117 | par_mo[3] = 2.; |
| 118 | par_mo[4] = -zmax1; |
| 119 | par_mo[5] = rmin; |
| 120 | par_mo[6] = rmax; |
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121 | par_mo[7] = zmax1; |
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122 | par_mo[8] = rmin; |
| 123 | par_mo[9] = rmax; |
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124 | pMC->Gsvolu("TRD ", "PGON", idtmed[1301-1], par_mo, nparmo); |
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125 | pMC->Gsdvn("UTRS", "TRD ", nsect, 2); |
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126 | |
| 127 | // The minimal width of a sector in rphi-direction |
| 128 | Float_t widmi = rmin * TMath::Sin(kPI/nsect); |
| 129 | // The maximal width of a sector in rphi-direction |
| 130 | Float_t widma = rmax * TMath::Sin(kPI/nsect); |
| 131 | // The total thickness of the spaceframe (Al + Air) |
| 132 | Float_t frame = widmi - (widpl1 / 2); |
| 133 | |
| 134 | // Definition of the inner part of the detector frame (Air) |
| 135 | par_fr[0] = widmi - alframe / 2.; |
| 136 | par_fr[1] = widma - alframe / 2.; |
| 137 | par_fr[2] = zmax1; |
| 138 | par_fr[3] = (rmax - rmin) / 2; |
| 139 | pMC->Gsvolu("UTRI", "TRD1", idtmed[1302-1], par_fr, nparfr); |
| 140 | |
| 141 | // Some parameter for the chambers |
| 142 | Float_t lendifc = (zmax1 - zmax2) / nmodul; |
| 143 | Float_t heightc = (rmax - rmin ) / nmodul; |
| 144 | Float_t widdifc = (widma - widmi) / nmodul; |
| 145 | |
| 146 | // Definition of the chambers |
| 147 | Char_t ctagc[5], ctagi[5]; |
| 148 | for (Int_t icham = 1; icham <= ncham; ++icham) { |
| 149 | |
| 150 | // Carbon frame of the inner chambers (C) |
| 151 | par_ch[0] = widmi + (icham-1) * widdifc - frame; |
| 152 | par_ch[1] = zleni / 2.; |
| 153 | par_ch[2] = heightc / 2.; |
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154 | sprintf(ctagc,"UCI%1d",icham); |
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155 | pMC->Gsvolu(ctagc, "BOX ", idtmed[1307-1], par_ch, nparch); |
| 156 | // Inner part of the inner chambers (Air) |
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157 | par_ch[0] -= ccframe; |
| 158 | par_ch[1] -= ccframe; |
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159 | sprintf(ctagc,"UII%1d",icham); |
| 160 | pMC->Gsvolu(ctagc, "BOX ", idtmed[1302-1], par_ch, nparch); |
| 161 | |
| 162 | // Carbon frame of the neighbouring chambers (C) |
| 163 | par_ch[0] = widmi + (icham-1) * widdifc - frame; |
| 164 | par_ch[1] = zlenn / 2.; |
| 165 | par_ch[2] = heightc / 2.; |
| 166 | sprintf(ctagc,"UCN%1d",icham); |
| 167 | pMC->Gsvolu(ctagc, "BOX ", idtmed[1307-1], par_ch, nparch); |
| 168 | // Inner part of the neighbouring chambers (Air) |
| 169 | par_ch[0] -= ccframe; |
| 170 | par_ch[1] -= ccframe; |
| 171 | sprintf(ctagc,"UIN%1d",icham); |
| 172 | pMC->Gsvolu(ctagc, "BOX ", idtmed[1302-1], par_ch, nparch); |
| 173 | |
| 174 | // Carbon frame of the outer chambers (C) |
| 175 | par_ch[0] = widmi + (icham-1) * widdifc - frame; |
| 176 | par_ch[1] = (icham - 6) * lendifc / 2. + zleno / 2.; |
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177 | par_ch[2] = heightc / 2.; |
| 178 | sprintf(ctagc,"UCO%1d",icham); |
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179 | pMC->Gsvolu(ctagc, "BOX ", idtmed[1307-1], par_ch, nparch); |
| 180 | // Inner part of the outer chambers (Air) |
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181 | par_ch[0] -= ccframe; |
| 182 | par_ch[1] -= ccframe; |
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183 | sprintf(ctagc,"UIO%1d",icham); |
| 184 | pMC->Gsvolu(ctagc, "BOX ", idtmed[1302-1], par_ch, nparch); |
| 185 | |
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186 | } |
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187 | |
| 188 | // Definition of the layers in each inner chamber |
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189 | par_ic[0] = -1.; |
| 190 | par_ic[1] = -1.; |
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191 | // G10 layer (radiator layer) |
| 192 | par_ic[2] = sethick / 2; |
| 193 | pMC->Gsvolu("UT0I", "BOX ", idtmed[1313-1], par_ic, nparic); |
| 194 | // CO2 layer (radiator) |
| 195 | par_ic[2] = rathick / 2; |
| 196 | pMC->Gsvolu("UT1I", "BOX ", idtmed[1312-1], par_ic, nparic); |
| 197 | // PE layer (radiator) |
| 198 | par_ic[2] = pethick / 2; |
| 199 | pMC->Gsvolu("UT2I", "BOX ", idtmed[1303-1], par_ic, nparic); |
| 200 | // Mylar layer (entrance window + HV cathode) |
| 201 | par_ic[2] = mythick / 2; |
| 202 | pMC->Gsvolu("UT3I", "BOX ", idtmed[1308-1], par_ic, nparic); |
| 203 | // Xe/Isobutane layer (gasvolume) |
| 204 | par_ic[2] = xethick / 2.; |
| 205 | for (Int_t icham = 1; icham <= 6; ++icham) { |
| 206 | sprintf(ctagc,"UXI%1d",icham); |
| 207 | pMC->Gsvolu(ctagc, "BOX ", idtmed[1309-1], par_ic, nparic); |
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208 | } |
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209 | // Cu layer (pad plane) |
| 210 | par_ic[2] = cuthick / 2; |
| 211 | pMC->Gsvolu("UT5I", "BOX ", idtmed[1305-1], par_ic, nparic); |
| 212 | // G10 layer (support structure) |
| 213 | par_ic[2] = suthick / 2; |
| 214 | pMC->Gsvolu("UT6I", "BOX ", idtmed[1313-1], par_ic, nparic); |
| 215 | // Cu layer (FEE + signal lines) |
| 216 | par_ic[2] = fethick / 2; |
| 217 | pMC->Gsvolu("UT7I", "BOX ", idtmed[1305-1], par_ic, nparic); |
| 218 | // PE layer (cooling devices) |
| 219 | par_ic[2] = cothick / 2; |
| 220 | pMC->Gsvolu("UT8I", "BOX ", idtmed[1303-1], par_ic, nparic); |
| 221 | // Water layer (cooling) |
| 222 | par_ic[2] = wathick / 2; |
| 223 | pMC->Gsvolu("UT9I", "BOX ", idtmed[1314-1], par_ic, nparic); |
| 224 | |
| 225 | // Definition of the layers in each neighbouring chamber |
| 226 | par_nc[0] = -1.; |
| 227 | par_nc[1] = -1.; |
| 228 | // G10 layer (radiator layer) |
| 229 | par_nc[2] = sethick / 2; |
| 230 | pMC->Gsvolu("UT0N", "BOX ", idtmed[1313-1], par_nc, nparnc); |
| 231 | // CO2 layer (radiator) |
| 232 | par_nc[2] = rathick / 2; |
| 233 | pMC->Gsvolu("UT1N", "BOX ", idtmed[1312-1], par_nc, nparnc); |
| 234 | // PE layer (radiator) |
| 235 | par_nc[2] = pethick / 2; |
| 236 | pMC->Gsvolu("UT2N", "BOX ", idtmed[1303-1], par_nc, nparnc); |
| 237 | // Mylar layer (entrance window + HV cathode) |
| 238 | par_nc[2] = mythick / 2; |
| 239 | pMC->Gsvolu("UT3N", "BOX ", idtmed[1308-1], par_nc, nparnc); |
| 240 | // Xe/Isobutane layer (gasvolume) |
| 241 | par_nc[2] = xethick / 2.; |
| 242 | for (Int_t icham = 1; icham <= 6; ++icham) { |
| 243 | sprintf(ctagc,"UXN%1d",icham); |
| 244 | pMC->Gsvolu(ctagc, "BOX ", idtmed[1309-1], par_nc, nparnc); |
| 245 | } |
| 246 | // Cu layer (pad plane) |
| 247 | par_nc[2] = cuthick / 2; |
| 248 | pMC->Gsvolu("UT5N", "BOX ", idtmed[1305-1], par_nc, nparnc); |
| 249 | // G10 layer (support structure) |
| 250 | par_nc[2] = suthick / 2; |
| 251 | pMC->Gsvolu("UT6N", "BOX ", idtmed[1313-1], par_nc, nparnc); |
| 252 | // Cu layer (FEE + signal lines) |
| 253 | par_nc[2] = fethick / 2; |
| 254 | pMC->Gsvolu("UT7N", "BOX ", idtmed[1305-1], par_nc, nparnc); |
| 255 | // PE layer (cooling devices) |
| 256 | par_nc[2] = cothick / 2; |
| 257 | pMC->Gsvolu("UT8N", "BOX ", idtmed[1303-1], par_nc, nparnc); |
| 258 | // Water layer (cooling) |
| 259 | par_nc[2] = wathick / 2; |
| 260 | pMC->Gsvolu("UT9N", "BOX ", idtmed[1314-1], par_nc, nparnc); |
| 261 | |
| 262 | // Definition of the layers in each outer chamber |
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263 | par_oc[0] = -1.; |
| 264 | par_oc[1] = -1.; |
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265 | // G10 layer (radiator layer) |
| 266 | par_oc[2] = sethick / 2; |
| 267 | pMC->Gsvolu("UT0O", "BOX ", idtmed[1313-1], par_oc, nparoc); |
| 268 | // CO2 layer (radiator) |
| 269 | par_oc[2] = rathick / 2; |
| 270 | pMC->Gsvolu("UT1O", "BOX ", idtmed[1312-1], par_oc, nparoc); |
| 271 | // PE layer (radiator) |
| 272 | par_oc[2] = pethick / 2; |
| 273 | pMC->Gsvolu("UT2O", "BOX ", idtmed[1303-1], par_oc, nparoc); |
| 274 | // Mylar layer (entrance window + HV cathode) |
| 275 | par_oc[2] = mythick / 2; |
| 276 | pMC->Gsvolu("UT3O", "BOX ", idtmed[1308-1], par_oc, nparoc); |
| 277 | // Xe/Isobutane layer (gasvolume) |
| 278 | par_oc[2] = xethick / 2.; |
| 279 | for (Int_t icham = 1; icham <= 6; ++icham) { |
| 280 | sprintf(ctagc,"UXO%1d",icham); |
| 281 | pMC->Gsvolu(ctagc, "BOX ", idtmed[1309-1], par_oc, nparoc); |
| fe4da5cc |
282 | } |
| d3f347ff |
283 | // Cu layer (pad plane) |
| 284 | par_oc[2] = cuthick / 2; |
| 285 | pMC->Gsvolu("UT5O", "BOX ", idtmed[1305-1], par_oc, nparoc); |
| 286 | // G10 layer (support structure) |
| 287 | par_oc[2] = suthick / 2; |
| 288 | pMC->Gsvolu("UT6O", "BOX ", idtmed[1313-1], par_oc, nparoc); |
| 289 | // Cu layer (FEE + signal lines) |
| 290 | par_oc[2] = fethick / 2; |
| 291 | pMC->Gsvolu("UT7O", "BOX ", idtmed[1305-1], par_oc, nparoc); |
| 292 | // PE layer (cooling devices) |
| 293 | par_oc[2] = cothick / 2; |
| 294 | pMC->Gsvolu("UT8O", "BOX ", idtmed[1303-1], par_oc, nparoc); |
| 295 | // Water layer (cooling) |
| 296 | par_oc[2] = wathick / 2; |
| 297 | pMC->Gsvolu("UT9O", "BOX ", idtmed[1314-1], par_oc, nparoc); |
| 298 | |
| 299 | ////////////////////////////////////////////////////////////////////////// |
| 300 | // Positioning of Volumes |
| 301 | ////////////////////////////////////////////////////////////////////////// |
| 302 | |
| 303 | // The rotation matrices |
| 304 | AliMatrix(idmat[0], 90., 90., 180., 0., 90., 0.); |
| 305 | AliMatrix(idmat[1], 90., 90., 0., 0., 90., 0.); |
| 306 | |
| 307 | // Position of the layers in a chamber |
| 308 | pMC->Gspos("UT2I", 1, "UT1I", 0., 0., pezpos, 0, "ONLY"); |
| 309 | pMC->Gspos("UT2N", 1, "UT1N", 0., 0., pezpos, 0, "ONLY"); |
| 310 | pMC->Gspos("UT2O", 1, "UT1O", 0., 0., pezpos, 0, "ONLY"); |
| 311 | for (Int_t icham = 1; icham <= ncham; ++icham) { |
| 312 | // The inner chambers |
| fe4da5cc |
313 | sprintf(ctagi,"UII%1d",icham); |
| d3f347ff |
314 | sprintf(ctagc,"UXI%1d",icham); |
| 315 | pMC->Gspos("UT9I", icham, ctagi, 0., 0., wazpos, 0, "ONLY"); |
| 316 | pMC->Gspos("UT8I", icham, ctagi, 0., 0., cozpos, 0, "ONLY"); |
| 317 | pMC->Gspos("UT7I", icham, ctagi, 0., 0., fezpos, 0, "ONLY"); |
| 318 | pMC->Gspos("UT6I", icham, ctagi, 0., 0., suzpos, 0, "ONLY"); |
| fe4da5cc |
319 | pMC->Gspos("UT5I", icham, ctagi, 0., 0., cuzpos, 0, "ONLY"); |
| d3f347ff |
320 | pMC->Gspos(ctagc , 1, ctagi, 0., 0., xezpos, 0, "ONLY"); |
| fe4da5cc |
321 | pMC->Gspos("UT3I", icham, ctagi, 0., 0., myzpos, 0, "ONLY"); |
| 322 | pMC->Gspos("UT1I", icham, ctagi, 0., 0., razpos, 0, "ONLY"); |
| d3f347ff |
323 | pMC->Gspos("UT0I", icham, ctagi, 0., 0., sezpos, 0, "ONLY"); |
| 324 | // The neighbouring chambers |
| 325 | sprintf(ctagi,"UIN%1d",icham); |
| 326 | sprintf(ctagc,"UXN%1d",icham); |
| 327 | pMC->Gspos("UT9N", icham, ctagi, 0., 0., wazpos, 0, "ONLY"); |
| 328 | pMC->Gspos("UT8N", icham, ctagi, 0., 0., cozpos, 0, "ONLY"); |
| 329 | pMC->Gspos("UT7N", icham, ctagi, 0., 0., fezpos, 0, "ONLY"); |
| 330 | pMC->Gspos("UT6N", icham, ctagi, 0., 0., suzpos, 0, "ONLY"); |
| 331 | pMC->Gspos("UT5N", icham, ctagi, 0., 0., cuzpos, 0, "ONLY"); |
| 332 | pMC->Gspos(ctagc , 1, ctagi, 0., 0., xezpos, 0, "ONLY"); |
| 333 | pMC->Gspos("UT3N", icham, ctagi, 0., 0., myzpos, 0, "ONLY"); |
| 334 | pMC->Gspos("UT1N", icham, ctagi, 0., 0., razpos, 0, "ONLY"); |
| 335 | pMC->Gspos("UT0N", icham, ctagi, 0., 0., sezpos, 0, "ONLY"); |
| 336 | // The outer chambers |
| 337 | sprintf(ctagi,"UIO%1d",icham); |
| 338 | sprintf(ctagc,"UXO%1d",icham); |
| 339 | pMC->Gspos("UT9O", icham, ctagi, 0., 0., wazpos, 0, "ONLY"); |
| 340 | pMC->Gspos("UT8O", icham, ctagi, 0., 0., cozpos, 0, "ONLY"); |
| 341 | pMC->Gspos("UT7O", icham, ctagi, 0., 0., fezpos, 0, "ONLY"); |
| 342 | pMC->Gspos("UT6O", icham, ctagi, 0., 0., suzpos, 0, "ONLY"); |
| fe4da5cc |
343 | pMC->Gspos("UT5O", icham, ctagi, 0., 0., cuzpos, 0, "ONLY"); |
| d3f347ff |
344 | pMC->Gspos(ctagc , 1, ctagi, 0., 0., xezpos, 0, "ONLY"); |
| fe4da5cc |
345 | pMC->Gspos("UT3O", icham, ctagi, 0., 0., myzpos, 0, "ONLY"); |
| 346 | pMC->Gspos("UT1O", icham, ctagi, 0., 0., razpos, 0, "ONLY"); |
| d3f347ff |
347 | pMC->Gspos("UT0O", icham, ctagi, 0., 0., sezpos, 0, "ONLY"); |
| fe4da5cc |
348 | } |
| d3f347ff |
349 | |
| 350 | // Position of the inner part of the chambers in the carbon-frames |
| 351 | for (Int_t icham = 1; icham <= ncham; ++icham) { |
| 352 | xpos = 0.; |
| 353 | ypos = 0.; |
| 354 | zpos = 0.; |
| 355 | // The inner chambers |
| fe4da5cc |
356 | sprintf(ctagi,"UII%1d",icham); |
| 357 | sprintf(ctagc,"UCI%1d",icham); |
| d3f347ff |
358 | pMC->Gspos(ctagi, 1, ctagc, xpos, ypos, zpos, 0, "ONLY"); |
| 359 | // The neighbouring chambers |
| 360 | sprintf(ctagi,"UIN%1d",icham); |
| 361 | sprintf(ctagc,"UCN%1d",icham); |
| 362 | pMC->Gspos(ctagi, 1, ctagc, xpos, ypos, zpos, 0, "ONLY"); |
| 363 | // The outer chambers |
| fe4da5cc |
364 | sprintf(ctagi,"UIO%1d",icham); |
| 365 | sprintf(ctagc,"UCO%1d",icham); |
| d3f347ff |
366 | pMC->Gspos(ctagi, 1, ctagc, xpos, ypos, zpos, 0, "ONLY"); |
| fe4da5cc |
367 | } |
| d3f347ff |
368 | |
| 369 | // Position of the chambers in the full TRD-setup |
| 370 | for (Int_t icham = 1; icham <= ncham; ++icham) { |
| 371 | // The inner chambers |
| fe4da5cc |
372 | xpos = 0.; |
| 373 | ypos = 0.; |
| d3f347ff |
374 | zpos = (icham-0.5) * heightc - (rmax - rmin) / 2; |
| fe4da5cc |
375 | sprintf(ctagc,"UCI%1d",icham); |
| d3f347ff |
376 | pMC->Gspos(ctagc, 1, "UTRI", xpos, ypos, zpos, 0, "ONLY"); |
| 377 | // The neighbouring chambers |
| fe4da5cc |
378 | xpos = 0.; |
| d3f347ff |
379 | ypos = (zleni + zlenn) / 2.; |
| 380 | zpos = (icham-0.5) * heightc - (rmax - rmin) / 2; |
| 381 | sprintf(ctagc,"UCN%1d",icham); |
| 382 | pMC->Gspos(ctagc, 1, "UTRI", xpos, ypos, zpos, 0, "ONLY"); |
| 383 | ypos = -ypos; |
| 384 | sprintf(ctagc,"UCN%1d",icham); |
| 385 | pMC->Gspos(ctagc, 2, "UTRI", xpos, ypos, zpos, 0, "ONLY"); |
| 386 | // The outer chambers |
| 387 | xpos = 0.; |
| 388 | ypos = (zleni / 2. + zlenn + zmax2 + (icham-1) * lendifc) / 2.; |
| 389 | zpos = (icham-0.5) * heightc - (rmax-rmin)/2; |
| 390 | sprintf(ctagc,"UCO%1d",icham); |
| 391 | pMC->Gspos(ctagc, 1, "UTRI", xpos, ypos, zpos, 0, "ONLY"); |
| 392 | ypos = -ypos; |
| fe4da5cc |
393 | sprintf(ctagc,"UCO%1d",icham); |
| d3f347ff |
394 | pMC->Gspos(ctagc, 2, "UTRI", xpos, ypos, zpos, 0, "ONLY"); |
| fe4da5cc |
395 | } |
| d3f347ff |
396 | |
| 397 | // Position of the inner part of the detector frame |
| 398 | xpos = (rmax + rmin) / 2; |
| 399 | ypos = 0.; |
| fe4da5cc |
400 | zpos = 0.; |
| d3f347ff |
401 | pMC->Gspos("UTRI", 1, "UTRS", xpos, ypos, zpos, idmat[0], "ONLY"); |
| 402 | |
| 403 | // Position of the TRD mother volume in the ALICE experiment |
| 404 | xpos = 0.; |
| fe4da5cc |
405 | ypos = 0.; |
| d3f347ff |
406 | zpos = 0.; |
| 407 | pMC->Gspos("TRD ", 1, "ALIC", xpos, ypos, zpos, 0, "ONLY"); |
| 408 | |
| fe4da5cc |
409 | } |
| 410 | |
| 411 | //_____________________________________________________________________________ |
| 05e51f55 |
412 | void AliTRDv2::DrawModule() |
| fe4da5cc |
413 | { |
| 414 | // |
| 415 | // Draw a shaded view of the Transition Radiation Detector version 1 |
| 416 | // |
| 417 | |
| 418 | AliMC* pMC = AliMC::GetMC(); |
| 419 | |
| 420 | // Set everything unseen |
| 421 | pMC->Gsatt("*", "seen", -1); |
| d3f347ff |
422 | |
| fe4da5cc |
423 | // Set ALIC mother transparent |
| 424 | pMC->Gsatt("ALIC","SEEN",0); |
| d3f347ff |
425 | |
| fe4da5cc |
426 | // Set the volumes visible |
| d3f347ff |
427 | pMC->Gsatt("TRD ","SEEN",0); |
| fe4da5cc |
428 | pMC->Gsatt("UTRS","SEEN",0); |
| d3f347ff |
429 | pMC->Gsatt("UTRI","SEEN",0); |
| 430 | Char_t ctag[5]; |
| 431 | for (Int_t icham = 0; icham < ncham; ++icham) { |
| 432 | sprintf(ctag,"UCI%1d",icham+1); |
| 433 | pMC->Gsatt(ctag,"SEEN",0); |
| 434 | sprintf(ctag,"UCN%1d",icham+1); |
| 435 | pMC->Gsatt(ctag,"SEEN",0); |
| 436 | sprintf(ctag,"UCO%1d",icham+1); |
| 437 | pMC->Gsatt(ctag,"SEEN",0); |
| 438 | sprintf(ctag,"UII%1d",icham+1); |
| 439 | pMC->Gsatt(ctag,"SEEN",0); |
| 440 | sprintf(ctag,"UIN%1d",icham+1); |
| 441 | pMC->Gsatt(ctag,"SEEN",0); |
| 442 | sprintf(ctag,"UIO%1d",icham+1); |
| 443 | pMC->Gsatt(ctag,"SEEN",0); |
| 444 | sprintf(ctag,"UXI%1d",icham+1); |
| 445 | pMC->Gsatt(ctag,"SEEN",1); |
| 446 | sprintf(ctag,"UXN%1d",icham+1); |
| 447 | pMC->Gsatt(ctag,"SEEN",1); |
| 448 | sprintf(ctag,"UXO%1d",icham+1); |
| 449 | pMC->Gsatt(ctag,"SEEN",1); |
| 450 | } |
| fe4da5cc |
451 | pMC->Gsatt("UT1I","SEEN",1); |
| d3f347ff |
452 | pMC->Gsatt("UT1N","SEEN",1); |
| fe4da5cc |
453 | pMC->Gsatt("UT1O","SEEN",1); |
| d3f347ff |
454 | |
| fe4da5cc |
455 | pMC->Gdopt("hide", "on"); |
| 456 | pMC->Gdopt("shad", "on"); |
| 457 | pMC->Gsatt("*", "fill", 7); |
| 458 | pMC->SetClipBox("."); |
| 459 | pMC->SetClipBox("*", 0, 2000, -2000, 2000, -2000, 2000); |
| 460 | pMC->DefaultRange(); |
| 461 | pMC->Gdraw("alic", 40, 30, 0, 12, 9.4, .021, .021); |
| 462 | pMC->Gdhead(1111, "Transition Radiation Detector Version 2"); |
| 463 | pMC->Gdman(18, 4, "MAN"); |
| 464 | pMC->Gdopt("hide", "off"); |
| 465 | } |
| 466 | |
| 467 | //_____________________________________________________________________________ |
| 468 | void AliTRDv2::CreateMaterials() |
| 469 | { |
| 470 | // |
| 471 | // Create materials for the Transition Radiation Detector version 2 |
| 472 | // |
| fe4da5cc |
473 | AliTRD::CreateMaterials(); |
| 474 | } |
| 475 | |
| 476 | //_____________________________________________________________________________ |
| 477 | void AliTRDv2::Init() |
| 478 | { |
| 479 | // |
| 480 | // Initialise Transition Radiation Detector after geometry has been built |
| 481 | // |
| d3f347ff |
482 | |
| 483 | // First ionization potential (eV) for the gas mixture (90% Xe + 10% CO2) |
| 484 | const Float_t kPoti = 12.1; |
| 485 | // Maximum energy (50 keV); |
| 486 | const Float_t kEend = 50000.0; |
| 487 | |
| fe4da5cc |
488 | AliTRD::Init(); |
| d3f347ff |
489 | |
| fe4da5cc |
490 | AliMC* pMC = AliMC::GetMC(); |
| d3f347ff |
491 | |
| 492 | // Get the sensitive volumes |
| 493 | Char_t ctag[5]; |
| 494 | for (Int_t icham = 0; icham < ncham; ++icham) { |
| 495 | sprintf(ctag,"UXI%1d",icham+1); |
| 496 | fIdSensI[icham] = pMC->VolId(ctag); |
| 497 | sprintf(ctag,"UXN%1d",icham+1); |
| 498 | fIdSensN[icham] = pMC->VolId(ctag); |
| 499 | sprintf(ctag,"UXO%1d",icham+1); |
| 500 | fIdSensO[icham] = pMC->VolId(ctag); |
| 501 | } |
| 502 | |
| 503 | Float_t Poti = TMath::Log(kPoti); |
| 504 | Float_t Eend = TMath::Log(kEend); |
| 505 | |
| 506 | // Ermilova distribution for the delta-ray spectrum |
| 507 | fDeltaE = new TF1("deltae",Ermilova,Poti,Eend,0); |
| 508 | |
| fe4da5cc |
509 | } |
| 510 | |
| 511 | //_____________________________________________________________________________ |
| 512 | void AliTRDv2::StepManager() |
| 513 | { |
| 514 | // |
| 515 | // Called at every step in the Transition Radiation Detector version 2 |
| 516 | // |
| d3f347ff |
517 | |
| 518 | Int_t idSens, icSens, id; |
| fe4da5cc |
519 | Int_t iPla, iCha, iSec; |
| 520 | Int_t iOut; |
| 521 | Int_t vol[3]; |
| 522 | Int_t iPid; |
| d3f347ff |
523 | |
| 524 | const Double_t kBig = 1.0E+12; |
| 525 | |
| 526 | Float_t hits[4]; |
| 527 | Float_t mom[4]; |
| fe4da5cc |
528 | Float_t random[1]; |
| 529 | Float_t charge; |
| fe4da5cc |
530 | Float_t aMass; |
| d3f347ff |
531 | |
| 532 | Double_t pTot; |
| 533 | Double_t qTot; |
| 534 | Double_t eDelta; |
| 535 | Double_t betaGamma, pp; |
| 536 | |
| fe4da5cc |
537 | TClonesArray &lhits = *fHits; |
| d3f347ff |
538 | |
| fe4da5cc |
539 | AliMC* pMC = AliMC::GetMC(); |
| d3f347ff |
540 | |
| fe4da5cc |
541 | // Ionization energy |
| d3f347ff |
542 | const Float_t kWion = 22.04; |
| fe4da5cc |
543 | // Maximum energy for e+ e- g for the step-size calculation |
| d3f347ff |
544 | const Float_t kPTotMax = 0.002; |
| fe4da5cc |
545 | // Plateau value of the energy-loss for electron in xenon |
| 546 | // taken from: Allison + Comb, Ann. Rev. Nucl. Sci. (1980), 30, 253 |
| d3f347ff |
547 | //const Double_t kPlateau = 1.70; |
| 548 | // the averaged value (26/3/99) |
| 549 | const Float_t kPlateau = 1.55; |
| fe4da5cc |
550 | // dN1/dx|min for the gas mixture (90% Xe + 10% CO2) |
| d3f347ff |
551 | const Float_t kPrim = 48.0; |
| 552 | // First ionization potential (eV) for the gas mixture (90% Xe + 10% CO2) |
| 553 | const Float_t kPoti = 12.1; |
| 554 | |
| fe4da5cc |
555 | // Set the maximum step size to a very large number for all |
| 556 | // neutral particles and those outside the driftvolume |
| 557 | pMC->SetMaxStep(kBig); |
| d3f347ff |
558 | |
| fe4da5cc |
559 | // Use only charged tracks |
| 560 | if (( pMC->TrackCharge() ) && |
| 561 | (!pMC->TrackStop() ) && |
| 562 | (!pMC->TrackDisappear())) { |
| d3f347ff |
563 | |
| fe4da5cc |
564 | // Find the sensitive volume |
| 565 | idSens = pMC->CurrentVol(0,icSens); |
| 566 | iPla = 0; |
| 567 | iOut = 0; |
| d3f347ff |
568 | for (Int_t icham = 0; icham < ncham; ++icham) { |
| 569 | if (idSens == fIdSensI[icham]) { |
| 570 | iOut = 0; |
| 571 | iPla = icham + 1; |
| 572 | } |
| 573 | if (idSens == fIdSensN[icham]) { |
| 574 | iOut = 1; |
| 575 | iPla = icham + 1; |
| 576 | } |
| 577 | if (idSens == fIdSensO[icham]) { |
| 578 | iOut = 2; |
| 579 | iPla = icham + 1; |
| 580 | } |
| 581 | } |
| 582 | |
| fe4da5cc |
583 | // Inside a sensitive volume? |
| 584 | if (iPla) { |
| d3f347ff |
585 | |
| 586 | // Calculate the energy of the delta-electrons |
| 587 | eDelta = TMath::Exp(fDeltaE->GetRandom()) - kPoti; |
| 588 | eDelta = TMath::Max(eDelta,0.0); |
| 589 | |
| 590 | // The number of secondary electrons created |
| 591 | qTot = (Double_t) ((Int_t) (eDelta / kWion) + 1); |
| 592 | |
| fe4da5cc |
593 | // The sector number |
| d3f347ff |
594 | id = pMC->CurrentVolOff(4,0,iSec); |
| 595 | |
| fe4da5cc |
596 | // The chamber number |
| d3f347ff |
597 | // 1: outer left |
| 598 | // 2: neighbouring left |
| 599 | // 3: inner |
| 600 | // 4: neighbouring right |
| 601 | // 5: outer right |
| 602 | id = pMC->CurrentVolOff(2,0,iCha); |
| 603 | if (iCha == 1) |
| 604 | iCha = 3 + iOut; |
| 605 | else |
| 606 | iCha = 3 - iOut; |
| 607 | |
| fe4da5cc |
608 | vol[0] = iSec; |
| 609 | vol[1] = iCha; |
| 610 | vol[2] = iPla; |
| 611 | |
| d3f347ff |
612 | // Check on selected volumes |
| 613 | Int_t addthishit = 1; |
| 614 | if (fSensSelect) { |
| 615 | if ((fSensPlane) && (vol[2] != fSensPlane )) addthishit = 0; |
| 616 | if ((fSensChamber) && (vol[1] != fSensChamber)) addthishit = 0; |
| 617 | if ((fSensSector) && (vol[0] != fSensSector )) addthishit = 0; |
| 618 | } |
| 619 | |
| 620 | if (addthishit) { |
| 621 | |
| 622 | // Add this hit |
| 623 | pMC->TrackPosition(hits); |
| 624 | hits[3] = qTot; |
| 625 | new(lhits[fNhits++]) AliTRDhit(fIshunt,gAlice->CurrentTrack(),vol,hits); |
| 626 | |
| 627 | // The energy loss according to Bethe Bloch |
| 628 | pMC->TrackMomentum(mom); |
| 629 | pTot = mom[3]; |
| 630 | iPid = pMC->TrackPid(); |
| 631 | if ( (iPid > 3) || |
| 632 | ((iPid <= 3) && (pTot < kPTotMax))) { |
| 633 | aMass = pMC->TrackMass(); |
| 634 | betaGamma = pTot / aMass; |
| 635 | pp = kPrim * BetheBloch(betaGamma); |
| 636 | // Take charge > 1 into account |
| 637 | charge = pMC->TrackCharge(); |
| 638 | if (TMath::Abs(charge) > 1) pp = pp * charge*charge; |
| 639 | } |
| 640 | // Electrons above 20 Mev/c are at the plateau |
| 641 | else { |
| 642 | pp = kPrim * kPlateau; |
| 643 | } |
| fe4da5cc |
644 | |
| d3f347ff |
645 | // Calculate the maximum step size for the next tracking step |
| 646 | if (pp > 0) { |
| 647 | do |
| 648 | pMC->Rndm(random,1); |
| 649 | while ((random[0] == 1.) || (random[0] == 0.)); |
| 650 | pMC->SetMaxStep( - TMath::Log(random[0]) / pp); |
| 651 | } |
| 652 | |
| fe4da5cc |
653 | } |
| fe4da5cc |
654 | else { |
| d3f347ff |
655 | // set step size to maximal value |
| 656 | pMC->SetMaxStep(kBig); |
| fe4da5cc |
657 | } |
| d3f347ff |
658 | |
| fe4da5cc |
659 | } |
| d3f347ff |
660 | |
| 661 | } |
| 662 | |
| 663 | } |
| 664 | |
| 665 | //_____________________________________________________________________________ |
| 666 | Double_t AliTRDv2::BetheBloch(Double_t bg) |
| 667 | { |
| 668 | // |
| 669 | // Parametrization of the Bethe-Bloch-curve |
| 670 | // The parametrization is the same as for the TPC and is taken from Lehrhaus. |
| 671 | // |
| 672 | |
| 673 | // The parameters have been adjusted to Xe-data found in: |
| 674 | // Allison & Cobb, Ann. Rev. Nucl. Sci. (1980), 30, 253 |
| 675 | //const Double_t kP1 = 0.76176E-1; |
| 676 | //const Double_t kP2 = 10.632; |
| 677 | //const Double_t kP3 = 3.17983E-6; |
| 678 | //const Double_t kP4 = 1.8631; |
| 679 | //const Double_t kP5 = 1.9479; |
| 680 | |
| 681 | // This parameters have been adjusted to averaged values from GEANT |
| 682 | const Double_t kP1 = 7.17960e-02; |
| 683 | const Double_t kP2 = 8.54196; |
| 684 | const Double_t kP3 = 1.38065e-06; |
| 685 | const Double_t kP4 = 5.30972; |
| 686 | const Double_t kP5 = 2.83798; |
| 687 | |
| 688 | if (bg > 0) { |
| 689 | Double_t yy = bg / TMath::Sqrt(1. + bg*bg); |
| 690 | Double_t aa = TMath::Power(yy,kP4); |
| 691 | Double_t bb = TMath::Power((1./bg),kP5); |
| 692 | bb = TMath::Log(kP3 + bb); |
| 693 | return ((kP2 - aa - bb)*kP1 / aa); |
| fe4da5cc |
694 | } |
| d3f347ff |
695 | else |
| 696 | return 0; |
| 697 | |
| 698 | } |
| 699 | |
| 700 | //_____________________________________________________________________________ |
| 701 | Double_t Ermilova(Double_t *x, Double_t *par) |
| 702 | { |
| 703 | // |
| 704 | // Calculates the delta-ray energy distribution according to Ermilova |
| 705 | // Logarithmic scale ! |
| 706 | // |
| 707 | |
| 708 | Double_t energy; |
| 709 | Double_t dpos; |
| 710 | Double_t dnde; |
| 711 | |
| 712 | Int_t pos1, pos2; |
| 713 | |
| 714 | const Int_t nV = 31; |
| 715 | |
| 716 | Float_t vxe[nV] = { 2.3026, 2.9957, 3.4012, 3.6889, 3.9120 |
| 717 | , 4.0943, 4.2485, 4.3820, 4.4998, 4.6052 |
| 718 | , 4.7005, 5.0752, 5.2983, 5.7038, 5.9915 |
| 719 | , 6.2146, 6.5221, 6.9078, 7.3132, 7.6009 |
| 720 | , 8.0064, 8.5172, 8.6995, 8.9872, 9.2103 |
| 721 | , 9.4727, 9.9035,10.3735,10.5966,10.8198 |
| 722 | ,11.5129 }; |
| 723 | |
| 724 | Float_t vye[nV] = { 80.0 , 31.0 , 23.3 , 21.1 , 21.0 |
| 725 | , 20.9 , 20.8 , 20.0 , 16.0 , 11.0 |
| 726 | , 8.0 , 6.0 , 5.2 , 4.6 , 4.0 |
| 727 | , 3.5 , 3.0 , 1.4 , 0.67 , 0.44 |
| 728 | , 0.3 , 0.18 , 0.12 , 0.08 , 0.056 |
| 729 | , 0.04 , 0.023, 0.015, 0.011, 0.01 |
| 730 | , 0.004 }; |
| 731 | |
| 732 | energy = x[0]; |
| 733 | |
| 734 | // Find the position |
| 735 | pos1 = pos2 = 0; |
| 736 | dpos = 0; |
| 737 | do { |
| 738 | dpos = energy - vxe[pos2++]; |
| 739 | } |
| 740 | while (dpos > 0); |
| 741 | pos2--; |
| 742 | if (pos2 > nV) pos2 = nV; |
| 743 | pos1 = pos2 - 1; |
| 744 | |
| 745 | // Differentiate between the sampling points |
| 746 | dnde = (vye[pos1] - vye[pos2]) / (vxe[pos2] - vxe[pos1]); |
| 747 | |
| 748 | return dnde; |
| 749 | |
| fe4da5cc |
750 | } |
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