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4347b38f | 1 | /************************************************************************** |
c4bcfd14 | 2 | * Copyright(c) 2004, ALICE Experiment at CERN, All rights reserved. * |
4347b38f | 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 | **************************************************************************/ | |
4347b38f | 15 | /* $Id$ */ |
c2fc1258 | 16 | /** @file AliFMDRing.cxx |
17 | @author Christian Holm Christensen <cholm@nbi.dk> | |
18 | @date Mon Mar 27 12:47:43 2006 | |
19 | @brief FMD ring geometry parameters | |
20 | */ | |
c4bcfd14 | 21 | //__________________________________________________________________ |
4347b38f | 22 | // |
23 | // Utility class to help implement collection of FMD modules into | |
6169f936 | 24 | // rings. This is used by AliFMDDetector and AliFMDGeometry. |
1a1fdef7 | 25 | // The AliFMDGeometry object owns the AliFMDRing objects, and the |
26 | // AliFMDDetector objects reference these. That is, the AliFMDRing | |
27 | // objects are share amoung the AliFMDDetector objects. | |
4347b38f | 28 | // |
29 | // Latest changes by Christian Holm Christensen | |
30 | // | |
5edc364e | 31 | |
9edefa04 | 32 | #include <TMath.h> // ROOT_TMath |
33 | #include <TVector2.h> // ROOT_TVector2 | |
34 | ||
02a27b50 | 35 | // #include <AliLog.h> // ALILOG_H |
e802be3e | 36 | #include "AliFMDRing.h" // ALIFMDRING_H |
4347b38f | 37 | |
1a1fdef7 | 38 | //==================================================================== |
e6a0eb08 | 39 | ClassImp(AliFMDRing) |
1a1fdef7 | 40 | #if 0 |
41 | ; // This is here to keep Emacs for indenting the next line | |
42 | #endif | |
4347b38f | 43 | |
44 | //____________________________________________________________________ | |
1a1fdef7 | 45 | AliFMDRing::AliFMDRing(Char_t id) |
46 | : TNamed(Form("FMD%c", id), "Forward multiplicity ring"), | |
47 | fId(id), | |
b5ee4425 | 48 | fBondingWidth(0), |
49 | fWaferRadius(0), | |
50 | fSiThickness(0), | |
51 | fLowR(0), | |
52 | fHighR(0), | |
53 | fMinR(0), | |
54 | fMaxR(0), | |
55 | fTheta(0), | |
56 | fNStrips(0), | |
57 | fRingDepth(0), | |
58 | fLegRadius(0), | |
59 | fLegLength(0), | |
60 | fLegOffset(0), | |
61 | fModuleSpacing(0), | |
62 | fPrintboardThickness(0), | |
63 | fCopperThickness(0), | |
64 | fChipThickness(0), | |
65 | fSpacing(0), | |
d98fbfa5 | 66 | fHoneycombThickness(0.), |
67 | fAlThickness(0.), | |
f70f588a | 68 | fVerticies(0), |
69 | fSensorVerticies(0), | |
70 | fHybridVerticies(0), | |
71 | fFeetPositions(0) | |
4347b38f | 72 | { |
088f8e79 | 73 | // CTOR |
1a1fdef7 | 74 | SetBondingWidth(); |
75 | SetWaferRadius(); | |
76 | SetSiThickness(); | |
77 | SetLegRadius(); | |
78 | SetLegLength(); | |
79 | SetLegOffset(); | |
80 | SetModuleSpacing(); | |
81 | SetPrintboardThickness(); | |
4ac75127 | 82 | SetCopperThickness(); |
83 | SetChipThickness(); | |
a1f80595 | 84 | SetSpacing(); |
d98fbfa5 | 85 | SetHoneycombThickness(); |
86 | SetAlThickness(); | |
4347b38f | 87 | |
1a1fdef7 | 88 | if (fId == 'I' || fId == 'i') { |
89 | SetLowR(4.3); | |
90 | SetHighR(17.2); | |
91 | SetTheta(36/2); | |
92 | SetNStrips(512); | |
f70f588a | 93 | Double_t base = 0; // 4.1915; |
94 | fFeetPositions.Add(new TVector2( 0.0551687, 8.0534-base)); | |
95 | fFeetPositions.Add(new TVector2( 2.9993, 12.9457-base)); | |
96 | fFeetPositions.Add(new TVector2(-2.9062, 12.9508-base)); | |
97 | ||
98 | fHybridVerticies.Add(new TVector2(0.0000, 4.1700)); | |
99 | fHybridVerticies.Add(new TVector2(1.0574, 4.1700)); | |
100 | fHybridVerticies.Add(new TVector2(4.6614, 15.2622)); | |
101 | fHybridVerticies.Add(new TVector2(0.9643, 17.4000)); | |
102 | fHybridVerticies.Add(new TVector2(0.0000, 17.4000)); | |
103 | ||
104 | fSensorVerticies.Add(new TVector2(0.0000, 4.1915)); | |
105 | fSensorVerticies.Add(new TVector2(1.5793, 4.1915)); | |
106 | fSensorVerticies.Add(new TVector2(5.2293, 15.4251)); | |
107 | fSensorVerticies.Add(new TVector2(1.9807, 17.3035)); | |
108 | fSensorVerticies.Add(new TVector2(0.0000, 17.3035)); | |
109 | ||
110 | fVerticies.Add(new TVector2(0.0000, 4.3000)); | |
111 | fVerticies.Add(new TVector2(1.3972, 4.3000)); | |
112 | fVerticies.Add(new TVector2(4.9895, 15.3560)); | |
113 | fVerticies.Add(new TVector2(1.8007, 17.2000)); | |
114 | fVerticies.Add(new TVector2(0.0000, 17.2000)); | |
1a1fdef7 | 115 | } |
116 | else if (fId == 'O' || fId == 'o') { | |
117 | SetLowR(15.6); | |
118 | SetHighR(28.0); | |
119 | SetTheta(18/2); | |
120 | SetNStrips(256); | |
f70f588a | 121 | Double_t base = 0; // 14.9104; |
122 | fFeetPositions.Add(new TVector2(-1.72540000, 20.6267-base)); | |
123 | fFeetPositions.Add(new TVector2( 1.72900000, 20.6267-base)); | |
124 | fFeetPositions.Add(new TVector2( 0.00177616, 26.6007-base)); | |
125 | ||
126 | fHybridVerticies.Add(new TVector2(0.0000, 14.9104)); | |
127 | fHybridVerticies.Add(new TVector2(2.0783, 14.9104)); | |
128 | fHybridVerticies.Add(new TVector2(3.9202, 26.5395)); | |
129 | fHybridVerticies.Add(new TVector2(0.6784, 28.2500)); | |
130 | fHybridVerticies.Add(new TVector2(0.0000, 28.2500)); | |
131 | ||
132 | fSensorVerticies.Add(new TVector2(0.0000, 15.0104)); | |
133 | fSensorVerticies.Add(new TVector2(2.5799, 15.0104)); | |
134 | fSensorVerticies.Add(new TVector2(4.4439, 26.7766)); | |
135 | fSensorVerticies.Add(new TVector2(1.8350, 28.1500)); | |
136 | fSensorVerticies.Add(new TVector2(0.0000, 28.1500)); | |
137 | ||
138 | fVerticies.Add(new TVector2(0.0000, 15.2104)); | |
139 | fVerticies.Add(new TVector2(2.4091, 15.2104)); | |
140 | fVerticies.Add(new TVector2(4.2231, 26.6638)); | |
141 | fVerticies.Add(new TVector2(1.8357, 27.9500)); | |
142 | fVerticies.Add(new TVector2(0.0000, 27.9500)); | |
4347b38f | 143 | } |
4347b38f | 144 | } |
145 | ||
4347b38f | 146 | //____________________________________________________________________ |
147 | void | |
1a1fdef7 | 148 | AliFMDRing::Init() |
4347b38f | 149 | { |
088f8e79 | 150 | // Initialize |
f70f588a | 151 | #if 0 |
1a1fdef7 | 152 | Double_t tanTheta = TMath::Tan(fTheta * TMath::Pi() / 180.); |
153 | Double_t tanTheta2 = TMath::Power(tanTheta,2); | |
154 | Double_t r2 = TMath::Power(fWaferRadius,2); | |
155 | Double_t yA = tanTheta * fLowR; | |
156 | Double_t lr2 = TMath::Power(fLowR, 2); | |
157 | Double_t hr2 = TMath::Power(fHighR,2); | |
158 | Double_t xD = fLowR + TMath::Sqrt(r2 - tanTheta2 * lr2); | |
159 | Double_t xD2 = TMath::Power(xD,2); | |
160 | Double_t yB = TMath::Sqrt(r2 - hr2 + 2 * fHighR * xD - xD2); | |
161 | Double_t xC = ((xD + TMath::Sqrt(-tanTheta2 * xD2 + r2 | |
162 | + r2 * tanTheta2)) | |
163 | / (1 + tanTheta2)); | |
164 | Double_t yC = tanTheta * xC; | |
4347b38f | 165 | |
1a1fdef7 | 166 | fVerticies.Expand(6); |
167 | fVerticies.AddAt(new TVector2(fLowR, -yA), 0); | |
168 | fVerticies.AddAt(new TVector2(xC, -yC), 1); | |
169 | fVerticies.AddAt(new TVector2(fHighR, -yB), 2); | |
170 | fVerticies.AddAt(new TVector2(fHighR, yB), 3); | |
171 | fVerticies.AddAt(new TVector2(xC, yC), 4); | |
172 | fVerticies.AddAt(new TVector2(fLowR, yA), 5); | |
f70f588a | 173 | #endif |
1a1fdef7 | 174 | |
54e415a8 | 175 | // A's length. Corresponds to distance from nominal beam line to the |
176 | // cornor of the active silicon element. | |
f70f588a | 177 | fMinR = GetVertex(1)->Mod(); // GetVertex(5)->Mod(); |
54e415a8 | 178 | // A's length. Corresponds to distance from nominal beam line to the |
179 | // cornor of the active silicon element. | |
180 | fMaxR = fHighR; | |
181 | ||
1a1fdef7 | 182 | fRingDepth = (fSiThickness + fPrintboardThickness |
4ac75127 | 183 | + fCopperThickness + fChipThickness |
184 | + fLegLength + fModuleSpacing + fSpacing); | |
4347b38f | 185 | } |
186 | ||
187 | //____________________________________________________________________ | |
1a1fdef7 | 188 | TVector2* |
189 | AliFMDRing::GetVertex(Int_t i) const | |
4347b38f | 190 | { |
088f8e79 | 191 | // Get the i'th vertex of polygon shape |
1a1fdef7 | 192 | return static_cast<TVector2*>(fVerticies.At(i)); |
4347b38f | 193 | } |
194 | ||
f70f588a | 195 | //____________________________________________________________________ |
196 | TVector2* | |
197 | AliFMDRing::GetSensorVertex(Int_t i) const | |
198 | { | |
199 | // Get the i'th vertex of polygon shape | |
200 | return static_cast<TVector2*>(fSensorVerticies.At(i)); | |
201 | } | |
202 | ||
203 | //____________________________________________________________________ | |
204 | TVector2* | |
205 | AliFMDRing::GetHybridVertex(Int_t i) const | |
206 | { | |
207 | // Get the i'th vertex of polygon shape | |
208 | return static_cast<TVector2*>(fHybridVerticies.At(i)); | |
209 | } | |
210 | ||
211 | //____________________________________________________________________ | |
212 | TVector2* | |
213 | AliFMDRing::GetFootPosition(Int_t i) const | |
214 | { | |
215 | // Get the i'th vertex of polygon shape | |
216 | return static_cast<TVector2*>(fFeetPositions.At(i)); | |
217 | } | |
218 | ||
bf000c32 | 219 | //____________________________________________________________________ |
220 | Double_t | |
221 | AliFMDRing::GetStripRadius(UShort_t strip) const | |
222 | { | |
223 | // Return the nominal strip radius | |
224 | Double_t rmax = GetMaxR(); | |
225 | Double_t stripoff = GetMinR(); | |
226 | Double_t dstrip = (rmax - stripoff) / GetNStrips(); | |
227 | return (strip + .5) * dstrip + stripoff; // fLowR | |
228 | } | |
229 | ||
f70f588a | 230 | //____________________________________________________________________ |
231 | Double_t | |
232 | AliFMDRing::GetModuleDepth() const | |
233 | { | |
234 | return (GetSiThickness() | |
235 | + GetSpacing() | |
236 | + GetPrintboardThickness() | |
237 | + GetCopperThickness() | |
238 | + GetChipThickness() | |
239 | + GetLegLength()); | |
240 | ||
241 | } | |
242 | ||
d98fbfa5 | 243 | //____________________________________________________________________ |
244 | Double_t | |
245 | AliFMDRing::GetFullDepth() const | |
246 | { | |
f70f588a | 247 | return (GetModuleDepth() |
248 | + GetModuleSpacing() | |
249 | + GetHoneycombThickness() | |
250 | + GetFMDDPrintboardThickness() | |
251 | + GetFMDDCopperThickness() | |
252 | + GetFMDDChipThickness() | |
d98fbfa5 | 253 | + 0.5); |
254 | } | |
255 | ||
4347b38f | 256 | //____________________________________________________________________ |
1a1fdef7 | 257 | void |
258 | AliFMDRing::Detector2XYZ(UShort_t sector, | |
259 | UShort_t strip, | |
260 | Double_t& x, | |
261 | Double_t& y, | |
262 | Double_t& z) const | |
4347b38f | 263 | { |
088f8e79 | 264 | // Translate detector coordinates (this,sector,strip) to global |
265 | // coordinates (x,y,z) | |
1a1fdef7 | 266 | if (sector >= GetNSectors()) { |
267 | Error("Detector2XYZ", "Invalid sector number %d (>=%d) in ring %c", | |
268 | sector, GetNSectors(), fId); | |
269 | return; | |
4347b38f | 270 | } |
1a1fdef7 | 271 | if (strip >= GetNStrips()) { |
272 | Error("Detector2XYZ", "Invalid strip number %d (>=%d)", | |
273 | strip, GetNStrips(), fId); | |
274 | return; | |
4347b38f | 275 | } |
1a1fdef7 | 276 | Double_t phi = Float_t(sector + .5) / GetNSectors() * 2 * TMath::Pi(); |
277 | Double_t r = Float_t(strip + .5) / GetNStrips() * (fHighR - fLowR) + fLowR; | |
278 | x = r * TMath::Cos(phi); | |
279 | y = r * TMath::Sin(phi); | |
280 | if (((sector / 2) % 2) == 1) | |
281 | z += TMath::Sign(fModuleSpacing, z); | |
4347b38f | 282 | } |
283 | ||
54e415a8 | 284 | //____________________________________________________________________ |
285 | Bool_t | |
286 | AliFMDRing::XYZ2Detector(Double_t x, | |
287 | Double_t y, | |
288 | Double_t z, | |
289 | UShort_t& sector, | |
290 | UShort_t& strip) const | |
291 | { | |
088f8e79 | 292 | // Translate global coordinates (x,y,z) to detector coordinates |
293 | // (this,sector,strip) | |
54e415a8 | 294 | sector = strip = 0; |
295 | Double_t r = TMath::Sqrt(x * x + y * y); | |
296 | Int_t str = Int_t((r - fMinR) / GetPitch()); | |
297 | if (str < 0 || str >= GetNStrips()) return kFALSE; | |
298 | ||
299 | Double_t phi = TMath::ATan2(y, x) * 180. / TMath::Pi(); | |
300 | if (phi < 0) phi = 360. + phi; | |
301 | Int_t sec = Int_t(phi / fTheta); | |
302 | if (sec < 0 || sec >= GetNSectors()) return kFALSE; | |
303 | if ((sec / 2) % 2 == 1) { | |
304 | if (TMath::Abs(z - TMath::Sign(fModuleSpacing, z)) >= 0.01) | |
305 | return kFALSE; | |
306 | } | |
307 | else if (TMath::Abs(z) >= 0.01) return kFALSE; | |
308 | ||
309 | strip = str; | |
310 | sector = sec; | |
311 | return kTRUE; | |
312 | } | |
fb848ec4 | 313 | //____________________________________________________________________ |
314 | Float_t | |
315 | AliFMDRing::GetStripLength(UShort_t strip) const | |
316 | { | |
317 | if(strip >= GetNStrips()) | |
318 | Error("GetStripLength", "Invalid strip number %d (>=%d)", | |
319 | strip, GetNStrips(), fId); | |
320 | ||
321 | Float_t rad = GetMaxR()-GetMinR(); | |
322 | ||
323 | Float_t segment = rad / GetNStrips(); | |
324 | ||
325 | TVector2* corner1 = GetVertex(2); | |
326 | TVector2* corner2 = GetVertex(3); | |
327 | ||
328 | Float_t slope = (corner1->Y() - corner2->Y()) / (corner1->X() - corner2->X()); | |
329 | Float_t constant = (corner2->Y()*corner1->X()-(corner2->X()*corner1->Y())) / (corner1->X() - corner2->X()); | |
330 | Float_t radius = GetMinR() + strip*segment; | |
331 | ||
332 | Float_t d = TMath::Power(TMath::Abs(radius*slope),2) + TMath::Power(radius,2) - TMath::Power(constant,2); | |
333 | ||
334 | Float_t arclength = GetBaseStripLength(strip); | |
335 | if(d>0) { | |
336 | ||
337 | Float_t x = (-1*TMath::Sqrt(d) -slope*constant) / (1+TMath::Power(slope,2)); | |
338 | Float_t y = slope*x + constant; | |
339 | Float_t theta = TMath::ATan2(x,y); | |
340 | ||
341 | if(x < corner1->X() && y > corner1->Y()) { | |
342 | arclength = radius*theta; //One sector since theta is by definition half-hybrid | |
343 | ||
344 | } | |
345 | ||
346 | } | |
347 | ||
348 | return arclength; | |
349 | ||
350 | ||
351 | } | |
352 | //____________________________________________________________________ | |
353 | Float_t | |
354 | AliFMDRing::GetBaseStripLength(UShort_t strip) const | |
355 | { | |
356 | Float_t rad = GetMaxR()-GetMinR(); | |
357 | Float_t segment = rad / GetNStrips(); | |
358 | Float_t basearc = 2*TMath::Pi() / (0.5*GetNSectors()); // One hybrid: 36 degrees inner, 18 outer | |
359 | Float_t radius = GetMinR() + strip*segment; | |
360 | Float_t basearclength = 0.5*basearc * radius; // One sector | |
361 | ||
362 | return basearclength; | |
363 | } | |
4347b38f | 364 | // |
365 | // EOF | |
366 | // |