Changeset 82db145 in git for external/TrackCovariance/TrkUtil.cc

Timestamp:

Apr 12, 2021, 6:33:23 PM (4 years ago)

Author:

Franco BEDESCHI <bed@…>

Branches:

master

Children:

c5696dd

Parents:

3cfe61d

Message:

Vertex fit add/remove tracks - TrkUtil has cluster counting info

File:

• external/TrackCovariance/TrkUtil.cc (modified) (8 diffs)

external/TrackCovariance/TrkUtil.cc

@@ -1 +1 @@
 #include "TrkUtil.h"
-#include <TMath.h>
 #include <iostream>
 
@@ -7 +6 @@
 {
         fBz = Bz;
+        fGasSel = 0;                            // Default is He-Isobuthane (90-10)
+        fRmin = 0.0;                            // Lower                DCH radius
+        fRmax = 0.0;                            // Higher       DCH radius
+        fZmin = 0.0;                            // Lower                DCH z
+        fZmax = 0.0;                            // Higher       DCH z
 }
 TrkUtil::TrkUtil()
 {
         fBz = 0.0;
+        fGasSel = 0;                            // Default is He-Isobuthane (90-10)
+        fRmin = 0.0;                            // Lower                DCH radius
+        fRmax = 0.0;                            // Higher       DCH radius
+        fZmin = 0.0;                            // Lower                DCH z
+        fZmax = 0.0;                            // Higher       DCH z
 }
 //
@@ -17 +26 @@
 {
         fBz = 0.0;
+        fGasSel = 0;                            // Default is He-Isobuthane (90-10)
+        fRmin = 0.0;                            // Lower                DCH radius
+        fRmax = 0.0;                            // Higher       DCH radius
+        fZmin = 0.0;                            // Lower                DCH z
+        fZmax = 0.0;                            // Higher       DCH z
 }
 //
@@ -29 +43 @@
         Double_t pt = p.Pt();
         Double_t C = a / (2 * pt);                      // Half curvature
-        //cout << "ObsTrk::XPtoPar: fB = " << fB << ", a = " << a << ", pt = " << pt << ", C = " << C << endl;
+        //std::cout << "ObsTrk::XPtoPar: fB = " << fB << ", a = " << a << ", pt = " << pt << ", C = " << C << std::endl;
         Double_t r2 = x.Perp2();
         Double_t cross = x(0) * p(1) - x(1) * p(0);
@@ -79 +93 @@
 TVector3 TrkUtil::ParToP(TVectorD Par)
 {
-        if (fBz == 0.0)
-std::cout << "TrkUtil::ParToP: Warning Bz not set" << std::endl;
+        if (fBz == 0.0)std::cout << "TrkUtil::ParToP: Warning Bz not set" << std::endl;
         //
         return ParToP(Par,fBz);
@@ -113 +126 @@
         Double_t b = -cSpeed() * fBz / 2.;
         pACTS(0) = 1000 * Par(0);               // D from m to mm
-        pACTS(1) = 1000 * Par(3);               // z0 from m to mm
+        pACTS(1) = 1000 * Par(3);       // z0 from m to mm
         pACTS(2) = Par(1);                      // Phi0 is unchanged
         pACTS(3) = TMath::ATan2(1.0, Par(4));           // Theta in [0, pi] range
@@ -136 +149 @@
         A(3, 1) = 1000.;                // z0-z0 conversion to mm
         A(4, 3) = -1.0 / (1.0 + ct * ct); // theta - cot(theta)
-        A(4, 4) = -C * ct / (b * TMath::Power(1.0 + ct * ct, 3.0 / 2.0)); // q/p-cot(theta)
+        A(4, 4) = -C * ct / (b * pow(1.0 + ct * ct, 3.0 / 2.0)); // q/p-cot(theta)
         //
         TMatrixDSym Cv = Cov;
@@ -218 +231 @@
         return Cmm;
 }
+//
+// Setup chamber volume
+void TrkUtil::SetDchBoundaries(Double_t Rmin, Double_t Rmax, Double_t Zmin, Double_t Zmax)
+{
+        fRmin = Rmin;                           // Lower                DCH radius
+        fRmax = Rmax;                           // Higher       DCH radius
+        fZmin = Zmin;                           // Lower                DCH z
+        fZmax = Zmax;                           // Higher       DCH z
+}
+//
+// Get Trakck length inside DCH volume
+Double_t TrkUtil::TrkLen(TVectorD Par)
+{
+        Double_t tLength = 0.0;
+        // Check if geometry is initialized
+        if (fZmin == 0.0 && fZmax == 0.0)
+        {
+                // No geometry set so send a warning and return 0
+                std::cout << "TrkUtil::TrkLen() called without a DCH volume defined" << std::endl;
+        }
+        else
+        {
+                //******************************************************************
+                // Determine the track length inside the chamber   ****
+                //******************************************************************
+                //
+                // Track pararameters
+                Double_t D = Par(0);            // Transverse impact parameter
+                Double_t phi0 = Par(1);         // Transverse direction at minimum approach
+                Double_t C = Par(2);            // Half curvature
+                Double_t z0 = Par(3);           // Z at minimum approach
+                Double_t ct = Par(4);           // cot(theta)
+                //std::cout << "TrkUtil:: parameters: D= " << D << ", phi0= " << phi0
+                //      << ", C= " << C << ", z0= " << z0 << ", ct= " << ct << std::endl;
+                //
+                // Track length per unit phase change 
+                Double_t Scale = TMath::Sqrt(1.0 + ct*ct) / (2.0*TMath::Abs(C));
+                //
+                // Find intersections with chamber boundaries
+                //
+                Double_t phRin = 0.0;                   // phase of inner cylinder 
+                Double_t phRin2= 0.0;                   // phase of inner cylinder intersection (2nd branch)
+                Double_t phRhi = 0.0;                   // phase of outer cylinder intersection
+                Double_t phZmn = 0.0;                   // phase of left wall intersection
+                Double_t phZmx = 0.0;                   // phase of right wall intersection
+                //  ... with inner cylinder
+                Double_t Rtop = TMath::Abs((1.0 + C*D) / C);
+
+                if (Rtop > fRmin && TMath::Abs(D) < fRmin) // *** don't treat large D tracks for the moment ***
+                {
+                        Double_t ph = 2 * TMath::ASin(C*TMath::Sqrt((fRmin*fRmin - D*D) / (1.0 + 2.0*C*D)));
+                        Double_t z = z0 + ct*ph / (2.0*C);
+
+                        //std::cout << "Rin intersection: ph = " << ph<<", z= "<<z << std::endl;
+
+                        if (z < fZmax && z > fZmin)     phRin = TMath::Abs(ph); // Intersection inside chamber volume   
+                        //
+                        // Include second branch of loopers
+                        Double_t ph2 = TMath::TwoPi() - TMath::Abs(ph);
+                        if (ph < 0)ph2 = -ph2;
+                        z = z0 + ct * ph2 / (2.0 * C);
+                        if (z < fZmax && z > fZmin)     phRin2 = TMath::Abs(ph2);       // Intersection inside chamber volume
+                }
+                //  ... with outer cylinder
+                if (Rtop > fRmax && TMath::Abs(D) < fRmax) // *** don't treat large D tracks for the moment ***
+                {
+                        Double_t ph = 2 * TMath::ASin(C*TMath::Sqrt((fRmax*fRmax - D*D) / (1.0 + 2.0*C*D)));
+                        Double_t z = z0 + ct*ph / (2.0*C);
+                        if (z < fZmax && z > fZmin)     phRhi = TMath::Abs(ph); // Intersection inside chamber volume   
+                }
+                //  ... with left wall
+                Double_t Zdir = (fZmin - z0) / ct;
+                if (Zdir > 0.0)
+                {
+                        Double_t ph = 2.0*C*Zdir;
+                        Double_t Rint = TMath::Sqrt(D*D + (1.0 + 2.0*C*D)*pow(TMath::Sin(ph / 2), 2) / (C*C));
+                        if (Rint < fRmax && Rint > fRmin)       phZmn = TMath::Abs(ph); // Intersection inside chamber volume   
+                }
+                //  ... with right wall
+                Zdir = (fZmax - z0) / ct;
+                if (Zdir > 0.0)
+                {
+                        Double_t ph = 2.0*C*Zdir;
+                        Double_t Rint = TMath::Sqrt(D*D + (1.0 + 2.0*C*D)*pow(TMath::Sin(ph / 2), 2) / (C*C));
+                        if (Rint < fRmax && Rint > fRmin)       phZmx = TMath::Abs(ph); // Intersection inside chamber volume   
+                }
+                //
+                // Order phases and keep the lowest two non-zero ones
+                //
+                const Int_t Nint = 5;
+                Double_t dPhase = 0.0;  // Phase difference between two close intersections
+                Double_t ph_arr[Nint] = { phRin, phRin2, phRhi, phZmn, phZmx };
+                Int_t srtind[Nint];
+                TMath::Sort(Nint, ph_arr, srtind, kFALSE);
+                Int_t iPos = -1;                // First element > 0
+                for (Int_t i = 0; i < Nint; i++)
+                {
+                        if (ph_arr[srtind[i]] <= 0.0) iPos = i;
+                }
+
+                if (iPos < Nint - 2)
+                {
+                        dPhase = ph_arr[srtind[iPos + 2]] - ph_arr[srtind[iPos + 1]];
+                        tLength = dPhase*Scale;
+                }
+        }
+        return tLength;
+}
+//
+// Return number of ionization clusters
+Bool_t TrkUtil::IonClusters(Double_t &Ncl, Double_t mass, TVectorD Par)
+{
+        //
+        // Units are meters/Tesla/GeV
+        //
+        Ncl = 0.0;
+        Bool_t Signal = kFALSE;
+        Double_t tLen = 0;
+        // Check if geometry is initialized
+        if (fZmin == 0.0 && fZmax == 0.0)
+        {
+                // No geometry set so send a warning and return 0
+                std::cout << "TrkUtil::IonClusters() called without a volume defined" << std::endl;
+        }
+        else tLen = TrkLen(Par);
+
+        //******************************************************************
+        // Now get the number of clusters                       ****
+        //******************************************************************
+        //
+        Double_t muClu = 0.0;   // mean number of clusters
+        Double_t bg = 0.0;              // beta*gamma
+        Ncl = 0.0;
+        if (tLen > 0.0)
+        {
+                Signal = kTRUE;
+                //
+                // Find beta*gamma
+                if (fBz == 0.0)
+                {
+                        Signal = kFALSE;
+                        std::cout << "TrkUtil::IonClusters: Please set Bz!!!" << std::endl;
+                }
+                else
+                {
+                        TVector3 p = ParToP(Par);
+                        bg = p.Mag() / mass;
+                        muClu = Nclusters(bg)*tLen;                             // Avg. number of clusters
+
+                        Ncl = gRandom->PoissonD(muClu);                 // Actual number of clusters
+                }
+
+        }
+//
+        return Signal;
+}
+//
+//
+Double_t TrkUtil::Nclusters(Double_t begam) 
+{
+        Int_t Opt = fGasSel;
+        Double_t Nclu = Nclusters(begam, Opt);
+        //
+        return Nclu;
+}
+//
+Double_t TrkUtil::Nclusters(Double_t begam, Int_t Opt) {
+        //
+        // Opt = 0: He 90 - Isobutane 10
+        //     = 1: pure He
+        //     = 2: Argon 50 - Ethane 50
+        //     = 3: pure Argon
+        //
+        //
+        std::vector<double> bg{ 0.5, 0.8, 1., 2., 3., 4., 5., 8., 10.,
+        12., 15., 20., 50., 100., 200., 500., 1000. };
+        // He 90 - Isobutane 10
+        std::vector<double> ncl_He_Iso{ 42.94, 23.6,18.97,12.98,12.2,12.13,
+        12.24,12.73,13.03,13.29,13.63,14.08,15.56,16.43,16.8,16.95,16.98 };
+        //
+        // pure He
+        std::vector<double> ncl_He{ 11.79,6.5,5.23,3.59,3.38,3.37,3.4,3.54,3.63,
+        3.7,3.8,3.92,4.33,4.61,4.78,4.87,4.89 };
+        //
+        // Argon 50 - Ethane 50
+        std::vector<double> ncl_Ar_Eth{ 130.04,71.55,57.56,39.44,37.08,36.9,
+        37.25,38.76,39.68,40.49,41.53,42.91,46.8,48.09,48.59,48.85,48.93 };
+        //
+        // pure Argon
+        std::vector<double> ncl_Ar{ 88.69,48.93,39.41,27.09,25.51,25.43,25.69,
+        26.78,27.44,28.02,28.77,29.78,32.67,33.75,34.24,34.57,34.68 };
+        //
+        Int_t nPoints = (Int_t)bg.size();
+        bg.push_back(10000.);
+        std::vector<double> ncl;
+        switch (Opt)
+        {
+        case 0: ncl = ncl_He_Iso;                       // He-Isobutane
+                break;
+        case 1: ncl = ncl_He;                           // pure He
+                break;
+        case 2: ncl = ncl_Ar_Eth;                       // Argon - Ethane
+                break;
+        case 3: ncl = ncl_Ar;                           // pure Argon
+                break;
+        }
+        ncl.push_back(ncl[nPoints - 1]);
+        Int_t ilow = 0;
+        while (begam > bg[ilow])ilow++;
+        ilow--;
+        //std::cout << "ilow= " << ilow << ", low = " << bg[ilow] << ", val = " << begam
+        //      << ", high = " << bg[ilow + 1] << std::endl;
+        //
+        Int_t ind[3] = { ilow, ilow + 1, ilow + 2 };
+        TVectorD y(3);
+        for (Int_t i = 0; i < 3; i++)y(i) = ncl[ind[i]];
+        TVectorD x(3);
+        for (Int_t i = 0; i < 3; i++)x(i) = bg[ind[i]];
+        TMatrixD Xval(3, 3);
+        for (Int_t i = 0; i < 3; i++)Xval(i, 0) = 1.0;
+        for (Int_t i = 0; i < 3; i++)Xval(i, 1) = x(i);
+        for (Int_t i = 0; i < 3; i++)Xval(i, 2) = x(i) * x(i);
+        //std::cout << "Xval:" << std::endl; Xval.Print();
+        Xval.Invert();
+        TVectorD coeff = Xval * y;
+        Double_t interp = coeff[0] + coeff[1] * begam + coeff[2] * begam * begam;
+        //std::cout << "val1= (" <<x(0)<<", "<< y(0) << "), val2= (" 
+        //      <<x(1)<<", "<< y(1) << "), val3= (" 
+        //      <<x(2)<<", "<< y(2)
+        //      << "), result= (" <<begam<<", "<< interp<<")" << std::endl;
+        //
+        if (TMath::IsNaN(interp))std::cout << "NaN found: bg= " << begam << ", Opt= " << Opt << std::endl;
+        if (begam < bg[0]) interp = 0.0;
+        //std::cout << "bg= " << begam << ", Opt= " << Opt <<", interp = "<<interp<< std::endl;
+        return 100*interp;
+}
+//
+Double_t TrkUtil::funcNcl(Double_t *xp, Double_t *par){
+        Double_t bg = xp[0];
+        return Nclusters(bg);
+}
+//
+void TrkUtil::SetGasMix(Int_t Opt)
+{
+        if (Opt < 0 || Opt > 3)
+        {
+                std::cout << "TrkUtil::SetGasMix Gas option not allowed. No action."
+                        << std::endl;
+        }
+        else fGasSel = Opt;
+}