/************************************************************************** * Copyright(c) 1998-1999, 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. * **************************************************************************/ /* $Log$ Revision 1.5 2004/04/20 14:37:22 hristov Using TMath::Abs instead of fabs, arrays of variable size created/deleted correctly (HP,Sun) Revision 1.4 2004/04/13 09:42:51 decaro Track reconstruction code for TOF: updating Revision 1.3 2003/12/29 18:40:39 hristov Copy/paste error corrected Revision 1.2 2003/12/29 17:26:01 hristov Using enum to initaialize static ints in the header file, the initialization of static floats moved to the implementation file Revision 1.1 2003/12/29 15:18:03 decaro TOF geometry updating (addition of AliTOFGeometry) Revision 0.05 2004/6/11 A.De Caro Implement Global method NpadXStrip Insert four float constants (originally in AliTOF class) Revision 0.04 2004/4/05 S.Arcelli Implement Global methods IsInsideThePad DistanceToPad Revision 0.03 2003/12/14 S.Arcelli Set Phi range [-180,180]->[0,360] Revision 0.02 2003/12/10 S.Arcelli: Implement Global methods GetPos & GetDetID Revision 0.01 2003/12/04 S.Arcelli */ #include #include /////////////////////////////////////////////////////////////////////////////// // // // TOF Geometry class // // // /////////////////////////////////////////////////////////////////////////////// #include "AliConst.h" #include "AliTOFGeometry.h" ClassImp(AliTOFGeometry) const Int_t AliTOFGeometry::fgkTimeDiff = 25000; // Min signal separation (ps) const Float_t AliTOFGeometry::fgkxTOF = 371.; // Inner radius of the TOF for Reconstruction (cm) const Float_t AliTOFGeometry::fgkRmin = 370.; // Inner radius of the TOF (cm) const Float_t AliTOFGeometry::fgkRmax = 399; // Outer radius of the TOF (cm) const Float_t AliTOFGeometry::fgkZlenA = 106.0; // length (cm) of the A module const Float_t AliTOFGeometry::fgkZlenB = 141.0; // length (cm) of the B module const Float_t AliTOFGeometry::fgkZlenC = 177.5; // length (cm) of the C module const Float_t AliTOFGeometry::fgkXPad = 2.5; // Pad size in the x direction (cm) const Float_t AliTOFGeometry::fgkZPad = 3.5; // Pad size in the z direction (cm) const Float_t AliTOFGeometry::fgkMaxhZtof = 371.5; // Max half z-size of TOF (cm) const Float_t AliTOFGeometry::fgkStripLength = 122.;// Strip Length (rho X phi direction) (cm) const Float_t AliTOFGeometry::fgkDeadBndX = 1.0; // Dead Boundaries of a Strip along X direction (length) (cm) const Float_t AliTOFGeometry::fgkDeadBndZ = 1.5; // Dead Boundaries of a Strip along Z direction (width) (cm) const Float_t AliTOFGeometry::fgkOverSpc = 15.3; // Space available for sensitive layers in radial direction (cm) const Float_t AliTOFGeometry::fgkSigmaForTail1= 2.;//Sig1 for simulation of TDC tails const Float_t AliTOFGeometry::fgkSigmaForTail2= 0.5;//Sig2 for simulation of TDC tails const Float_t AliTOFGeometry::fgkSpeedOfLight = 0.299792458;// c (10^9 m/s) const Float_t AliTOFGeometry::fgkPionMass = 0.13957;// pion mass (Gev/c^2) const Float_t AliTOFGeometry::fgkKaonMass = 0.49368;// kaon mass (Gev/c^2) const Float_t AliTOFGeometry::fgkProtonMass = 0.93827;// proton mass (Gev/c^2) const Float_t AliTOFGeometry::fgkElectronMass = 0.00051;// electron mass (Gev/c^2) const Float_t AliTOFGeometry::fgkMuonMass = 0.10566;// muon mass (Gev/c^2) const Float_t AliTOFGeometry::fgkDprecMin = 0.0000075;//num.prec.tolerance on Thmin const Float_t AliTOFGeometry::fgkDprecMax = 0.0000100;//num.prec.tolerance on Thma const Float_t AliTOFGeometry::fgkDprecCen = 0.0000005;//num.prec.tolerance on //_____________________________________________________________________________ AliTOFGeometry::AliTOFGeometry() { // // AliTOFGeometry default constructor // Init(); } //_____________________________________________________________________________ AliTOFGeometry::~AliTOFGeometry() { // // AliTOFGeometry destructor // } //_____________________________________________________________________________ void AliTOFGeometry::Init() { // // Initialize strip Tilt Angles and Heights // // Strips Tilt Angles Float_t const kangles[kNPlates][kMaxNstrip] ={ {44.494, 43.725, 42.946, 42.156, 41.357, 40.548, 39.729, 38.899, 38.060, 37.211, 36.353, 35.484, 34.606, 33.719, 32.822, 31.916, 31.001, 30.077, 29.144, 28.202 }, {26.884, 25.922, 24.952, 23.975, 22.989, 22.320, 21.016, 20.309, 19.015, 18.270, 16.989, 16.205, 14.941, 14.117, 12.871, 12.008, 10.784, 9.8807, 8.681, 0.0 }, { 7.5835, 6.4124, 5.4058, 4.2809, 3.2448, 2.1424, 1.078, -0., -1.078, -2.1424, -3.2448, -4.2809, -5.4058, -6.4124, -7.5835, 0.0, 0.0, 0.0, 0.0, 0.0 }, {-8.681, -9.8807, -10.784, -12.008, -12.871, -14.117, -14.941, -16.205, -16.989, -18.27, -19.015, -20.309, -21.016, -22.32, -22.989, -23.975, -24.952, -25.922, -26.884, 0. }, {-28.202, -29.144, -30.077, -31.001, -31.916, -32.822, -33.719, -34.606, -35.484, -36.353, -37.211, -38.06, -38.899, -39.729, -40.548, -41.357, -42.156, -42.946, -43.725, -44.494 }}; //Strips Heights Float_t const kheights[kNPlates][kMaxNstrip]= { {-5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5 }, {-6.3, -7.1, -7.9, -8.7, -9.5, -3, -9.5, -3, -9.5, -3, -9.5, -3.0, -9.5, -3.0, -9.5, -3, -9.5, -3, -9 , 0.}, { -3, -9, -4.5, -9, -4.5, -9, -4.5, -9, -4.5, -9, -4.5, -9, -4.5, -9, -3, 0.0, 0.0, 0.0, 0.0, 0.0 }, { -9, -3, -9.5, -3, -9.5, -3, -9.5, -3, -9.5, -3, -9.5, -3, -9.5, -3, -9.5, -8.7, -7.9, -7.1, -6.3, 0. }, {-5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5, -5.5 }}; // Deposit in fAngles, fHeights for (Int_t iplate = 0; iplate < kNPlates; iplate++) { for (Int_t istrip = 0; istrip < kMaxNstrip; istrip++) { fAngles[iplate][istrip] = kangles[iplate][istrip]; fHeights[iplate][istrip] = kheights[iplate][istrip]; } } fPhiSec = 360./kNSectors; } //_____________________________________________________________________________ Float_t AliTOFGeometry::DistanceToPad(Int_t *det, Float_t *pos) { // // Returns distance of space point with coor pos (x,y,z) (cm) wrt // pad with Detector Indices idet (iSect,iPlate,iStrip,iPadX,iPadZ) // //Transform pos into Sector Frame Float_t x = pos[0]; Float_t y = pos[1]; Float_t z = pos[2]; Float_t radius = TMath::Sqrt(x*x+y*y); Float_t phi=TMath::ATan2(y,x); if(phi<0) phi=2.*TMath::Pi()+phi; // Get the local angle in the sector philoc Float_t angle = phi*kRaddeg-( Int_t (kRaddeg*phi/20.) + 0.5)*fPhiSec; Float_t xs = radius*TMath::Cos(angle/kRaddeg); Float_t ys = radius*TMath::Sin(angle/kRaddeg); Float_t zs = z; // Do the same for the selected pad Float_t g[3]; GetPos(det,g); Float_t padRadius = TMath::Sqrt(g[0]*g[0]+g[1]*g[1]); Float_t padPhi=TMath::ATan2(g[1],g[0]); if(padPhi<0) padPhi=2.*TMath::Pi()+padPhi; // Get the local angle in the sector philoc Float_t padAngle = padPhi*kRaddeg-( Int_t (padPhi*kRaddeg/20.)+ 0.5) * fPhiSec; Float_t padxs = padRadius*TMath::Cos(padAngle/kRaddeg); Float_t padys = padRadius*TMath::Sin(padAngle/kRaddeg); Float_t padzs = g[2]; //Now move to local pad coordinate frame. Translate: Float_t xt = xs-padxs; Float_t yt = ys-padys; Float_t zt = zs-padzs; //Now Rotate: Float_t alpha = GetAngles(det[1],det[2]); Float_t xr = xt*TMath::Cos(alpha/kRaddeg)+zt*TMath::Sin(alpha/kRaddeg); Float_t yr = yt; Float_t zr = -xt*TMath::Sin(alpha/kRaddeg)+zt*TMath::Cos(alpha/kRaddeg); Float_t dist = TMath::Sqrt(xr*xr+yr*yr+zr*zr); return dist; } //_____________________________________________________________________________ Bool_t AliTOFGeometry::IsInsideThePad(Int_t *det, Float_t *pos) { // // Returns true if space point with coor pos (x,y,z) (cm) falls // inside pad with Detector Indices idet (iSect,iPlate,iStrip,iPadX,iPadZ) // Bool_t isInside=false; //Transform pos into Sector Frame Float_t x = pos[0]; Float_t y = pos[1]; Float_t z = pos[2]; Float_t radius = TMath::Sqrt(x*x+y*y); Float_t phi=TMath::ATan2(y,x); if(phi<0) phi=2.*TMath::Pi()+phi; // Get the local angle in the sector philoc Float_t angle = phi*kRaddeg-( Int_t (kRaddeg*phi/20.) + 0.5) *fPhiSec; Float_t xs = radius*TMath::Cos(angle/kRaddeg); Float_t ys = radius*TMath::Sin(angle/kRaddeg); Float_t zs = z; // Do the same for the selected pad Float_t g[3]; GetPos(det,g); Float_t padRadius = TMath::Sqrt(g[0]*g[0]+g[1]*g[1]); Float_t padPhi=TMath::ATan2(g[1],g[0]); if(padPhi<0) padPhi=2.*TMath::Pi()+padPhi; // Get the local angle in the sector philoc Float_t padAngle = padPhi*kRaddeg-( Int_t (padPhi*kRaddeg/20.)+ 0.5) * fPhiSec; Float_t padxs = padRadius*TMath::Cos(padAngle/kRaddeg); Float_t padys = padRadius*TMath::Sin(padAngle/kRaddeg); Float_t padzs = g[2]; //Now move to local pad coordinate frame. Translate: Float_t xt = xs-padxs; Float_t yt = ys-padys; Float_t zt = zs-padzs; //Now Rotate: Float_t alpha = GetAngles(det[1],det[2]); Float_t xr = xt*TMath::Cos(alpha/kRaddeg)+zt*TMath::Sin(alpha/kRaddeg); Float_t yr = yt; Float_t zr = -xt*TMath::Sin(alpha/kRaddeg)+zt*TMath::Cos(alpha/kRaddeg); if(TMath::Abs(xr)<=0.75 && TMath::Abs(yr)<= (fgkXPad*0.5) && TMath::Abs(zr)<= (fgkZPad*0.5)) isInside=true; return isInside; } //_____________________________________________________________________________ void AliTOFGeometry::GetPos(Int_t *det, Float_t *pos) { // // Returns space point coor (x,y,z) (cm) for Detector // Indices (iSect,iPlate,iStrip,iPadX,iPadZ) // pos[0]=GetX(det); pos[1]=GetY(det); pos[2]=GetZ(det); } //_____________________________________________________________________________ void AliTOFGeometry::GetDetID( Float_t *pos, Int_t *det) { // // Returns Detector Indices (iSect,iPlate,iStrip,iPadX,iPadZ) // space point coor (x,y,z) (cm) det[0]=GetSector(pos); det[1]=GetPlate(pos); det[2]=GetStrip(pos); det[3]=GetPadZ(pos); det[4]=GetPadX(pos); } //_____________________________________________________________________________ Float_t AliTOFGeometry::GetX(Int_t *det) { // // Returns X coordinate (cm) // Int_t isector = det[0]; Int_t iplate = det[1]; Int_t istrip = det[2]; Int_t ipadz = det[3]; Int_t ipadx = det[4]; // Find out distance d on the plane wrt median phi: Float_t d = (ipadx+0.5)*fgkXPad-(kNpadX*fgkXPad)*0.5; // The radius r in xy plane: Float_t r = (fgkRmin+fgkRmax)/2.+fHeights[iplate][istrip]+ (ipadz-0.5)*fgkZPad*TMath::Sin(fAngles[iplate][istrip]/kRaddeg)-0.25; // local azimuthal angle in the sector philoc Float_t philoc = TMath:: ATan(d/r); // azimuthal angle in the global frame phi Float_t phi = philoc*kRaddeg+(isector+0.5 )*fPhiSec; Float_t xCoor = r/TMath::Cos(philoc)*TMath::Cos(phi/kRaddeg); return xCoor; } //_____________________________________________________________________________ Float_t AliTOFGeometry::GetY(Int_t *det) { // // Returns Y coordinate (cm) // Int_t isector = det[0]; Int_t iplate = det[1]; Int_t istrip = det[2]; Int_t ipadz = det[3]; Int_t ipadx = det[4]; // Find out distance d on the plane wrt median phi: Float_t d = (ipadx+0.5)*fgkXPad-(kNpadX*fgkXPad)*0.5; // The radius r in xy plane: Float_t r = (fgkRmin+fgkRmax)/2.+fHeights[iplate][istrip]+ (ipadz-0.5)*fgkZPad*TMath::Sin(fAngles[iplate][istrip]/kRaddeg)-0.25; // local azimuthal angle in the sector philoc Float_t philoc = TMath:: ATan(d/r); // azimuthal angle in the global frame phi Float_t phi = philoc*kRaddeg+(isector+0.5 )*fPhiSec; Float_t yCoor = r/TMath::Cos(philoc)*TMath::Sin(phi/kRaddeg); return yCoor; } //_____________________________________________________________________________ Float_t AliTOFGeometry::GetZ(Int_t *det) { // // Returns Z coordinate (cm) // Int_t iplate = det[1]; Int_t istrip = det[2]; Int_t ipadz = det[3]; // The radius r in xy plane: Float_t r = (fgkRmin+fgkRmax)/2.+fHeights[iplate][istrip]; Float_t zCoor = r*TMath::Tan(0.5*TMath::Pi()-GetStripTheta(iplate,istrip))- (ipadz-0.5)*fgkZPad*TMath::Cos(fAngles[iplate][istrip]/kRaddeg); return zCoor; } //_____________________________________________________________________________ Int_t AliTOFGeometry::GetSector(Float_t *pos) { // // Returns the Sector index // Int_t iSect = -1; Float_t x = pos[0]; Float_t y = pos[1]; Float_t phi = TMath::ATan2(y,x); if(phi<0.) phi=2.*TMath::Pi()+phi; iSect = (Int_t) (phi*kRaddeg/fPhiSec); return iSect; } //_____________________________________________________________________________ Int_t AliTOFGeometry::GetPadX(Float_t *pos) { // // Returns the Pad index along X // Int_t iPadX = -1; Float_t x = pos[0]; Float_t y = pos[1]; Float_t z = pos[2]; Int_t isector = GetSector(pos); if(isector == -1){ cout << "Detector Index could not be determined" << endl; return iPadX;} Int_t iplate = GetPlate(pos); if(iplate == -1){ cout << "Detector Index could not be determined" << endl; return iPadX;} Int_t istrip = GetStrip(pos); if(istrip == -1){ cout << "Detector Index could not be determined" << endl; return iPadX;} Float_t rho=TMath::Sqrt(x*x+y*y); Float_t phi = TMath::ATan2(y,x); if(phi<0.) phi=2.*TMath::Pi()+phi; // Get the local angle in the sector philoc Float_t philoc = phi*kRaddeg-(isector+0.5)*fPhiSec; philoc*=TMath::Pi()/180.; // theta projected on the median of the sector Float_t theta = TMath::ATan2(rho*TMath::Cos(philoc),z); // The radius r in xy plane: Float_t r = (fgkRmin+fgkRmax)/2.+fHeights[iplate][istrip]+ (theta-GetStripTheta(iplate, istrip))/ (GetMaxStripTheta(iplate, istrip)-GetMinStripTheta(iplate, istrip)) * 2.*fgkZPad*TMath::Sin(fAngles[iplate][istrip]/kRaddeg)-0.25; // Find out distance projected onto the strip plane Float_t d = (r*TMath::Tan(philoc)+(kNpadX*fgkXPad)*0.5); iPadX = (Int_t) ( d/fgkXPad); return iPadX; } //_____________________________________________________________________________ Int_t AliTOFGeometry::GetPlate(Float_t *pos) { // // Returns the Plate index // Int_t iPlate=-1; Int_t isector = GetSector(pos); if(isector == -1){ cout << "Detector Index could not be determined" << endl; return iPlate;} Float_t x = pos[0]; Float_t y = pos[1]; Float_t z = pos[2]; Float_t rho=TMath::Sqrt(x*x+y*y); Float_t phi=TMath::ATan2(y,x); if(phi<0) phi=2.*TMath::Pi()+phi; // Get the local angle in the sector philoc Float_t philoc = phi*kRaddeg-(isector+0.5)*fPhiSec; philoc*=TMath::Pi()/180.; // theta projected on the median of the sector Float_t theta=TMath::ATan2(rho*TMath::Cos(philoc),z); for (Int_t i=0; i= theta && GetMinPlateTheta(i) <= theta)iPlate=i; } return iPlate; } //_____________________________________________________________________________ Int_t AliTOFGeometry::GetStrip(Float_t *pos) { // // Returns the Strip index // Int_t iStrip=-1; Int_t isector = GetSector(pos); if(isector == -1){ cout << "Detector Index could not be determined" << endl; return iStrip;} Int_t iplate = GetPlate(pos); if(iplate == -1){ cout << "Detector Index could not be determined" << endl; return iStrip;} Float_t x = pos[0]; Float_t y = pos[1]; Float_t z = pos[2]; Int_t nstrips=0; if(iplate==0 || iplate == 4)nstrips=kNStripC; if(iplate==1 || iplate == 3)nstrips=kNStripB; if(iplate==2) nstrips=kNStripA; Float_t rho=TMath::Sqrt(x*x+y*y); Float_t phi=TMath::ATan2(y,x); if(phi<0) phi=2.*TMath::Pi()+phi; // Get the local angle in the sector philoc Float_t philoc = phi*kRaddeg-(isector+0.5)*fPhiSec; philoc*=TMath::Pi()/180.; // theta projected on the median of the sector Float_t theta=TMath::ATan2(rho*TMath::Cos(philoc),z); for (Int_t istrip=0; istrip= theta && GetMinStripTheta(iplate,istrip) <= theta ) iStrip = istrip; } return iStrip; } //_____________________________________________________________________________ Int_t AliTOFGeometry::GetPadZ(Float_t *pos) { // // Returns the Pad index along Z // Int_t iPadZ = -1; Int_t isector = GetSector(pos); if(isector == -1){ cout << "Detector Index could not be determined" << endl; return iPadZ;} Int_t iplate = GetPlate(pos); if(iplate == -1){ cout << "Detector Index could not be determined" << endl; return iPadZ;} Int_t istrip = GetStrip(pos); if(istrip == -1){ cout << "Detector Index could not be determined" << endl; return iPadZ;} Float_t x = pos[0]; Float_t y = pos[1]; Float_t z = pos[2]; Float_t rho=TMath::Sqrt(x*x+y*y); Float_t phi=TMath::ATan2(y,x); if(phi<0) phi=2.*TMath::Pi()+phi; Float_t philoc = phi*kRaddeg-(isector+0.5)*fPhiSec; philoc*=TMath::Pi()/180.; Float_t theta=TMath::ATan2(rho*TMath::Cos(philoc),z); if (theta >= GetStripTheta(iplate, istrip))iPadZ=1; else iPadZ=0; return iPadZ; } //_____________________________________________________________________________ Float_t AliTOFGeometry::GetMinPlateTheta(Int_t iPlate) { // // Returns the minimum theta angle of a given plate iPlate (rad) // Int_t index=0; Float_t delta =0.; if(iPlate==0)delta = -1. ; if(iPlate==1)delta = -0.5; if(iPlate==3)delta = +0.5; if(iPlate==4)delta = +1. ; Float_t z=(fgkRmin+2.)*TMath::Tan(fAngles[iPlate][index]/kRaddeg)+delta; Float_t r=(fgkRmin+fgkRmax)/2.+fHeights[iPlate][index]; z =z+fgkZPad*TMath::Cos(fAngles[iPlate][index]/kRaddeg); r =r-fgkZPad*TMath::Sin(fAngles[iPlate][index]/kRaddeg); Float_t thmin = 0.5*TMath::Pi()-TMath::ATan(z/r)-fgkDprecMin; return thmin; } //_____________________________________________________________________________ Float_t AliTOFGeometry::GetMaxPlateTheta(Int_t iPlate) { // // Returns the maximum theta angle of a given plate iPlate (rad) Int_t index=0; if(iPlate==0 ||iPlate == 4)index=kNStripC-1; if(iPlate==1 ||iPlate == 3)index=kNStripB-1; if(iPlate==2) index=kNStripA-1; Float_t delta =0.; if(iPlate==0)delta = -1. ; if(iPlate==1)delta = -0.5; if(iPlate==3)delta = +0.5; if(iPlate==4)delta = +1. ; Float_t z=(fgkRmin+2.)*TMath::Tan(fAngles[iPlate][index]/kRaddeg)+delta; Float_t r=(fgkRmin+fgkRmax)/2.+fHeights[iPlate][index]; z =z-fgkZPad*TMath::Cos(fAngles[iPlate][index]/kRaddeg); r= r+fgkZPad*TMath::Sin(fAngles[iPlate][index]/kRaddeg); Float_t thmax = 0.5*TMath::Pi()-TMath::ATan(z/r)+fgkDprecMax; return thmax; } //_____________________________________________________________________________ Float_t AliTOFGeometry::GetMaxStripTheta(Int_t iPlate, Int_t iStrip) { // // Returns the maximum theta angle of a given strip iStrip (rad) // Float_t delta =0.; if(iPlate==0)delta = -1. ; if(iPlate==1)delta = -0.5; if(iPlate==3)delta = +0.5; if(iPlate==4)delta = +1. ; Float_t r =(fgkRmin+fgkRmax)/2.+fHeights[iPlate][iStrip]; Float_t z =(fgkRmin+2.)*TMath::Tan(fAngles[iPlate][iStrip]/kRaddeg)+delta; z = z-fgkZPad*TMath::Cos(fAngles[iPlate][iStrip]/kRaddeg); r = r+fgkZPad*TMath::Sin(fAngles[iPlate][iStrip]/kRaddeg); Float_t thmax =0.5*TMath::Pi()-TMath::ATan(z/r)+fgkDprecMax; return thmax; } //_____________________________________________________________________________ Float_t AliTOFGeometry::GetMinStripTheta(Int_t iPlate, Int_t iStrip) { // // Returns the minimum theta angle of a given Strip iStrip (rad) // Float_t delta =0.; if(iPlate==0)delta = -1. ; if(iPlate==1)delta = -0.5; if(iPlate==3)delta = +0.5; if(iPlate==4)delta = +1. ; Float_t r =(fgkRmin+fgkRmax)/2.+fHeights[iPlate][iStrip]; Float_t z =(fgkRmin+2.)*TMath::Tan(fAngles[iPlate][iStrip]/kRaddeg)+delta; z =z+fgkZPad*TMath::Cos(fAngles[iPlate][iStrip]/kRaddeg); r =r-fgkZPad*TMath::Sin(fAngles[iPlate][iStrip]/kRaddeg); Float_t thmin =0.5*TMath::Pi()-TMath::ATan(z/r)-fgkDprecMin; return thmin; } //_____________________________________________________________________________ Float_t AliTOFGeometry::GetStripTheta(Int_t iPlate, Int_t iStrip) { // // returns the median theta angle of a given strip iStrip (rad) // Float_t delta =0.; if(iPlate==0)delta = -1. ; if(iPlate==1)delta = -0.5; if(iPlate==3)delta = +0.5; if(iPlate==4)delta = +1. ; Float_t r =(fgkRmin+fgkRmax)/2.+fHeights[iPlate][iStrip]; Float_t z =(fgkRmin+2.)*TMath::Tan(fAngles[iPlate][iStrip]/kRaddeg)+delta; Float_t theta =0.5*TMath::Pi()-TMath::ATan(z/r); if(iPlate != 2){ if(theta > 0.5*TMath::Pi() )theta+=fgkDprecCen; if(theta < 0.5*TMath::Pi() )theta-=fgkDprecCen; } return theta; }