[u/mrichter/AliRoot.git] / FMD / AliFMDRing.cxx

/**************************************************************************
 * Copyright(c) 2004, ALICE Experiment at CERN, All rights reserved.      *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

/* $Id$ */

//__________________________________________________________________
//
// Utility class to help implement collection of FMD modules into
// rings.  This is used by AliFMDDetector and AliFMDGeometry.  
//
// The AliFMDGeometry object owns the AliFMDRing objects, and the
// AliFMDDetector objects reference these.  That is, the AliFMDRing
// objects are share amoung the AliFMDDetector objects.
//
// Latest changes by Christian Holm Christensen
//

#include <AliLog.h>		// ALILOG_H
#include "AliFMDRing.h"		// ALIFMDRING_H
#include <TMath.h>		// ROOT_TMath
#include <TVector2.h>		// ROOT_TVector2

//====================================================================
ClassImp(AliFMDRing)
#if 0
  ; // This is here to keep Emacs for indenting the next line
#endif

//____________________________________________________________________
AliFMDRing::AliFMDRing(Char_t id) 
  : TNamed(Form("FMD%c", id), "Forward multiplicity ring"), 
    fId(id), 
    fVerticies(0)
{
  // CTOR
  SetBondingWidth();
  SetWaferRadius();
  SetSiThickness();
  SetLegRadius();
  SetLegLength();
  SetLegOffset();
  SetModuleSpacing();
  SetPrintboardThickness();
  SetCopperThickness();
  SetChipThickness();
  SetSpacing();
  
  if (fId == 'I' || fId == 'i') {
    SetLowR(4.3);
    SetHighR(17.2);
    SetTheta(36/2);
    SetNStrips(512);
  }
  else if (fId == 'O' || fId == 'o') {
    SetLowR(15.6);
    SetHighR(28.0);
    SetTheta(18/2);
    SetNStrips(256);
  }
}

//____________________________________________________________________
void
AliFMDRing::Init()
{
  // Initialize 
  Double_t tanTheta  = TMath::Tan(fTheta * TMath::Pi() / 180.);
  Double_t tanTheta2 = TMath::Power(tanTheta,2);
  Double_t r2        = TMath::Power(fWaferRadius,2);
  Double_t yA        = tanTheta * fLowR;
  Double_t lr2       = TMath::Power(fLowR, 2);
  Double_t hr2       = TMath::Power(fHighR,2);
  Double_t xD        = fLowR + TMath::Sqrt(r2 - tanTheta2 * lr2);
  Double_t xD2       = TMath::Power(xD,2);
  Double_t yB        = TMath::Sqrt(r2 - hr2 + 2 * fHighR * xD - xD2);
  Double_t xC        = ((xD + TMath::Sqrt(-tanTheta2 * xD2 + r2
					  + r2 * tanTheta2)) 
			/ (1 + tanTheta2));
  Double_t yC        = tanTheta * xC;
  
  fVerticies.Expand(6);
  fVerticies.AddAt(new TVector2(fLowR,  -yA), 0);
  fVerticies.AddAt(new TVector2(xC,     -yC), 1);
  fVerticies.AddAt(new TVector2(fHighR, -yB), 2);
  fVerticies.AddAt(new TVector2(fHighR,  yB), 3);
  fVerticies.AddAt(new TVector2(xC,      yC), 4);
  fVerticies.AddAt(new TVector2(fLowR,   yA), 5);  

  // A's length. Corresponds to distance from nominal beam line to the
  // cornor of the active silicon element. 
  fMinR = GetVertex(5)->Mod();
  // A's length. Corresponds to distance from nominal beam line to the
  // cornor of the active silicon element. 
  fMaxR = fHighR;

  fRingDepth = (fSiThickness + fPrintboardThickness 
		+ fCopperThickness + fChipThickness 
		+ fLegLength + fModuleSpacing + fSpacing);
}

//____________________________________________________________________
TVector2*
AliFMDRing::GetVertex(Int_t i) const
{
  // Get the i'th vertex of polygon shape
  return static_cast<TVector2*>(fVerticies.At(i));
}

//____________________________________________________________________
Double_t
AliFMDRing::GetStripRadius(UShort_t strip) const
{
  // Return the nominal strip radius 
  Double_t rmax     = GetMaxR();
  Double_t stripoff = GetMinR();
  Double_t dstrip   = (rmax - stripoff) / GetNStrips();
  return (strip + .5) * dstrip + stripoff; // fLowR
}
 
//____________________________________________________________________
void
AliFMDRing::Detector2XYZ(UShort_t sector,
			 UShort_t strip, 
			 Double_t& x, 
			 Double_t& y, 
			 Double_t& z) const
{
  // Translate detector coordinates (this,sector,strip) to global
  // coordinates (x,y,z)
  if (sector >= GetNSectors()) {
    Error("Detector2XYZ", "Invalid sector number %d (>=%d) in ring %c", 
	  sector, GetNSectors(), fId);
    return;
  }
  if (strip >= GetNStrips()) {
    Error("Detector2XYZ", "Invalid strip number %d (>=%d)", 
	  strip, GetNStrips(), fId);
    return;
  }
  Double_t phi = Float_t(sector + .5) / GetNSectors() * 2 * TMath::Pi();
  Double_t r   = Float_t(strip + .5) / GetNStrips() * (fHighR - fLowR) + fLowR;
  x = r * TMath::Cos(phi);
  y = r * TMath::Sin(phi);
  if (((sector / 2) % 2) == 1) 
    z += TMath::Sign(fModuleSpacing, z);
}

//____________________________________________________________________
Bool_t
AliFMDRing::XYZ2Detector(Double_t  x, 
			 Double_t  y, 
			 Double_t  z,
			 UShort_t& sector,
			 UShort_t& strip) const
{
  // Translate global coordinates (x,y,z) to detector coordinates
  // (this,sector,strip)
  sector = strip = 0;
  Double_t r = TMath::Sqrt(x * x + y * y);
  Int_t str = Int_t((r - fMinR) / GetPitch());
  if (str < 0 || str >= GetNStrips()) return kFALSE;

  Double_t phi = TMath::ATan2(y, x) * 180. / TMath::Pi();
  if (phi < 0) phi = 360. + phi;
  Int_t sec = Int_t(phi / fTheta);
  if (sec < 0 || sec >= GetNSectors()) return kFALSE;
  if ((sec / 2) % 2 == 1) {
    if (TMath::Abs(z - TMath::Sign(fModuleSpacing, z)) >= 0.01)
      return kFALSE;
  }
  else if (TMath::Abs(z) >= 0.01) return kFALSE;

  strip  = str;
  sector = sec;
  return kTRUE;
}


//
// EOF
//
Commit	Line	Data
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	**************************************************************************/
	15
	16	/* $Id$ */
	17
c4bcfd14	18	//__________________________________________________________________
4347b38f	19	//
4347b38f	20	// Utility class to help implement collection of FMD modules into
1a1fdef7	21	// rings. This is used by AliFMDDetector and AliFMDGeometry.
4347b38f	22	//
1a1fdef7	23	// The AliFMDGeometry object owns the AliFMDRing objects, and the
	24	// AliFMDDetector objects reference these. That is, the AliFMDRing
	25	// objects are share amoung the AliFMDDetector objects.
4347b38f	26	//
	27	// Latest changes by Christian Holm Christensen
	28	//
5edc364e	29
56b1929b	30	#include <AliLog.h> // ALILOG_H
e802be3e	31	#include "AliFMDRing.h" // ALIFMDRING_H
56b1929b	32	#include <TMath.h> // ROOT_TMath
56b1929b	33	#include <TVector2.h> // ROOT_TVector2
4347b38f	34
1a1fdef7	35	//====================================================================
e6a0eb08	36	ClassImp(AliFMDRing)
1a1fdef7	37	#if 0
	38	; // This is here to keep Emacs for indenting the next line
	39	#endif
4347b38f	40
4347b38f	41	//____________________________________________________________________
1a1fdef7	42	AliFMDRing::AliFMDRing(Char_t id)
	43	: TNamed(Form("FMD%c", id), "Forward multiplicity ring"),
	44	fId(id),
	45	fVerticies(0)
4347b38f	46	{
088f8e79	47	// CTOR
1a1fdef7	48	SetBondingWidth();
	49	SetWaferRadius();
	50	SetSiThickness();
	51	SetLegRadius();
	52	SetLegLength();
	53	SetLegOffset();
	54	SetModuleSpacing();
	55	SetPrintboardThickness();
4ac75127	56	SetCopperThickness();
4ac75127	57	SetChipThickness();
a1f80595	58	SetSpacing();
4347b38f	59
1a1fdef7	60	if (fId == 'I' \|\| fId == 'i') {
	61	SetLowR(4.3);
	62	SetHighR(17.2);
	63	SetTheta(36/2);
	64	SetNStrips(512);
	65	}
	66	else if (fId == 'O' \|\| fId == 'o') {
	67	SetLowR(15.6);
	68	SetHighR(28.0);
	69	SetTheta(18/2);
	70	SetNStrips(256);
4347b38f	71	}
4347b38f	72	}
4347b38f	73
4347b38f	74	//____________________________________________________________________
4347b38f	75	void
1a1fdef7	76	AliFMDRing::Init()
4347b38f	77	{
088f8e79	78	// Initialize
1a1fdef7	79	Double_t tanTheta = TMath::Tan(fTheta * TMath::Pi() / 180.);
	80	Double_t tanTheta2 = TMath::Power(tanTheta,2);
	81	Double_t r2 = TMath::Power(fWaferRadius,2);
	82	Double_t yA = tanTheta * fLowR;
	83	Double_t lr2 = TMath::Power(fLowR, 2);
	84	Double_t hr2 = TMath::Power(fHighR,2);
	85	Double_t xD = fLowR + TMath::Sqrt(r2 - tanTheta2 * lr2);
	86	Double_t xD2 = TMath::Power(xD,2);
	87	Double_t yB = TMath::Sqrt(r2 - hr2 + 2 * fHighR * xD - xD2);
	88	Double_t xC = ((xD + TMath::Sqrt(-tanTheta2 * xD2 + r2
	89	+ r2 * tanTheta2))
	90	/ (1 + tanTheta2));
	91	Double_t yC = tanTheta * xC;
4347b38f	92
1a1fdef7	93	fVerticies.Expand(6);
	94	fVerticies.AddAt(new TVector2(fLowR, -yA), 0);
	95	fVerticies.AddAt(new TVector2(xC, -yC), 1);
	96	fVerticies.AddAt(new TVector2(fHighR, -yB), 2);
	97	fVerticies.AddAt(new TVector2(fHighR, yB), 3);
	98	fVerticies.AddAt(new TVector2(xC, yC), 4);
	99	fVerticies.AddAt(new TVector2(fLowR, yA), 5);
	100
54e415a8	101	// A's length. Corresponds to distance from nominal beam line to the
	102	// cornor of the active silicon element.
	103	fMinR = GetVertex(5)->Mod();
	104	// A's length. Corresponds to distance from nominal beam line to the
	105	// cornor of the active silicon element.
	106	fMaxR = fHighR;
	107
1a1fdef7	108	fRingDepth = (fSiThickness + fPrintboardThickness
4ac75127	109	+ fCopperThickness + fChipThickness
4ac75127	110	+ fLegLength + fModuleSpacing + fSpacing);
4347b38f	111	}
	112
	113	//____________________________________________________________________
1a1fdef7	114	TVector2*
1a1fdef7	115	AliFMDRing::GetVertex(Int_t i) const
4347b38f	116	{
088f8e79	117	// Get the i'th vertex of polygon shape
1a1fdef7	118	return static_cast<TVector2*>(fVerticies.At(i));
4347b38f	119	}
4347b38f	120
bf000c32	121	//____________________________________________________________________
	122	Double_t
	123	AliFMDRing::GetStripRadius(UShort_t strip) const
	124	{
	125	// Return the nominal strip radius
	126	Double_t rmax = GetMaxR();
	127	Double_t stripoff = GetMinR();
	128	Double_t dstrip = (rmax - stripoff) / GetNStrips();
	129	return (strip + .5) * dstrip + stripoff; // fLowR
	130	}
	131
4347b38f	132	//____________________________________________________________________
1a1fdef7	133	void
	134	AliFMDRing::Detector2XYZ(UShort_t sector,
	135	UShort_t strip,
	136	Double_t& x,
	137	Double_t& y,
	138	Double_t& z) const
4347b38f	139	{
088f8e79	140	// Translate detector coordinates (this,sector,strip) to global
088f8e79	141	// coordinates (x,y,z)
1a1fdef7	142	if (sector >= GetNSectors()) {
	143	Error("Detector2XYZ", "Invalid sector number %d (>=%d) in ring %c",
	144	sector, GetNSectors(), fId);
	145	return;
4347b38f	146	}
1a1fdef7	147	if (strip >= GetNStrips()) {
	148	Error("Detector2XYZ", "Invalid strip number %d (>=%d)",
	149	strip, GetNStrips(), fId);
	150	return;
4347b38f	151	}
1a1fdef7	152	Double_t phi = Float_t(sector + .5) / GetNSectors() * 2 * TMath::Pi();
	153	Double_t r = Float_t(strip + .5) / GetNStrips() * (fHighR - fLowR) + fLowR;
	154	x = r * TMath::Cos(phi);
	155	y = r * TMath::Sin(phi);
	156	if (((sector / 2) % 2) == 1)
	157	z += TMath::Sign(fModuleSpacing, z);
4347b38f	158	}
4347b38f	159
54e415a8	160	//____________________________________________________________________
	161	Bool_t
	162	AliFMDRing::XYZ2Detector(Double_t x,
	163	Double_t y,
	164	Double_t z,
	165	UShort_t& sector,
	166	UShort_t& strip) const
	167	{
088f8e79	168	// Translate global coordinates (x,y,z) to detector coordinates
088f8e79	169	// (this,sector,strip)
54e415a8	170	sector = strip = 0;
	171	Double_t r = TMath::Sqrt(x * x + y * y);
	172	Int_t str = Int_t((r - fMinR) / GetPitch());
	173	if (str < 0 \|\| str >= GetNStrips()) return kFALSE;
	174
	175	Double_t phi = TMath::ATan2(y, x) * 180. / TMath::Pi();
	176	if (phi < 0) phi = 360. + phi;
	177	Int_t sec = Int_t(phi / fTheta);
	178	if (sec < 0 \|\| sec >= GetNSectors()) return kFALSE;
	179	if ((sec / 2) % 2 == 1) {
	180	if (TMath::Abs(z - TMath::Sign(fModuleSpacing, z)) >= 0.01)
	181	return kFALSE;
	182	}
	183	else if (TMath::Abs(z) >= 0.01) return kFALSE;
	184
	185	strip = str;
	186	sector = sec;
	187	return kTRUE;
	188	}
	189
	190
4347b38f	191	//
	192	// EOF
	193	//