TSiLi.cxx

Go to the documentation of this file.

#include "TSiLi.h"
 
// Having these in Clear() caused issues as functions can be called abstract with out initialising a TSiLi
int    TSiLi::fRingNumber     = 10;
int    TSiLi::fSectorNumber   = 12;
double TSiLi::fOffsetPhi      = -165. * TMath::Pi() / 180.;   // For SPICE. Sectors upstream.
double TSiLi::fOuterDiameter  = 94.;
double TSiLi::fInnerDiameter  = 16.;
double TSiLi::fTargetDistance = -117.8;
 
double TSiLi::fSiLiNoiseFac        = 4;
double TSiLi::fSiLiDefaultDecay    = 4616.18;
double TSiLi::fSiLiDefaultRise     = 20.90;
double TSiLi::fSiLiDefaultBaseline = -4300;
double TSiLi::fBaseFreq            = 4;
 
double TSiLi::fSiLiCoincidenceTime     = 200;
bool   TSiLi::fRejectPossibleCrosstalk = false;
 
int TSiLi::fFitSiLiShape = 0;   // 0 no. 1 try if normal fit fail. 2 yes
 
TSiLi::TSiLi()
{
   Clear();
}
 
void TSiLi::Copy(TObject& rhs) const
{
   TDetector::Copy(rhs);
   static_cast<TSiLi&>(rhs).fAddbackHits = fAddbackHits;
   static_cast<TSiLi&>(rhs).fSiLiBits    = 0;
}
 
TSiLi::TSiLi(const TSiLi& rhs) : TDetector(rhs)
{
   rhs.Copy(*this);
}
 
void TSiLi::Clear(Option_t* opt)
{
   TDetector::Clear(opt);
   fAddbackHits.clear();
   fSiLiBits.Clear();
}
 
TSiLi& TSiLi::operator=(const TSiLi& rhs)
{
   rhs.Copy(*this);
   return *this;
}
 
void TSiLi::Print(Option_t*) const
{
   Print(std::cout);
}
 
void TSiLi::Print(std::ostream& out) const
{
   std::ostringstream str;
   str << GetMultiplicity() << " sili_hits" << std::endl;
   str << fAddbackHits.size() << " sili_addback_hits" << std::endl;
   out << str.str();
}
 
void TSiLi::AddFragment(const std::shared_ptr<const TFragment>& frag, TChannel* chan)
{
   if(frag == nullptr || chan == nullptr) {
      return;
   }
 
   auto* hit = new TSiLiHit(*frag);   // Waveform fitting happens in ctor now
   AddHit(hit);
}
 
// For mapping you may want to us -position.X() to account for looking upstream
TVector3 TSiLi::GetPosition(int ring, int sector, bool smear)
{
 
   double dist = fTargetDistance;
 
   double ring_width   = (fOuterDiameter - fInnerDiameter) * 0.5 / fRingNumber;   // radial width!
   double inner_radius = fInnerDiameter / 2.0;
   double phi_width    = 2. * TMath::Pi() / fSectorNumber;
   double phi          = phi_width * sector;   // the phi angle....
   phi += fOffsetPhi;
   double radius = inner_radius + ring_width * (ring + 0.5);
   if(smear) {
      double sep    = ring_width * 0.025;
      double r1     = radius - ring_width * 0.5 + sep;
      double r2     = radius + ring_width * 0.5 - sep;
      radius        = sqrt(gRandom->Uniform(r1 * r1, r2 * r2));
      double sepphi = sep / radius;
      phi           = gRandom->Uniform(phi - phi_width * 0.5 + sepphi, phi + phi_width * 0.5 - sepphi);
   }
 
   return {cos(phi) * radius, sin(phi) * radius, dist};
}
 
double TSiLi::GetSegmentArea(Int_t seg)
{
   int    r          = GetRing(seg);
   double ring_width = (fOuterDiameter - fInnerDiameter) * 0.5 / fRingNumber;   // radial width!
   double r1         = fInnerDiameter + r * ring_width;
   double r2         = fInnerDiameter + (r + 1) * ring_width;
 
   return (TMath::Pi() * (r2 * r2 - r1 * r1)) / fSectorNumber;
}
 
TSiLiHit* TSiLi::GetAddbackHit(const Int_t& i)
{
   /// Get the ith addback hit. This function calls GetAddbackMultiplicity to check the range of the index.
   /// This automatically calculates all addback hits if they haven't been calculated before.
   if(i < GetAddbackMultiplicity()) {
      return &fAddbackHits.at(i);
   }
   std::cerr << "Addback hits are out of range" << std::endl;
   throw grsi::exit_exception(1);
   return nullptr;
}
 
TSiLiHit* TSiLi::GetRejectHit(const Int_t& i)
{
   if(i < GetRejectMultiplicity()) {
      return GetSiLiHit(fRejectHits[i]);
   }
   std::cerr << "Reject hits are out of range" << std::endl;
   throw grsi::exit_exception(1);
   return nullptr;
}
 
Int_t TSiLi::GetRejectMultiplicity()
{
   GetAddbackMultiplicity();
   return fRejectHits.size();
}
 
// Currently Addback
//
// Itterate through all pixel hits
// If the hit has not yet been assigned to a "cluster" a new cluster is created containing it.
// The hit is compared all subsequent hits against fAddbackCriterion
// If they are accepted neighbours the second hit is also added to the cluster
//
// fAddbackCriterion checks if hits are within 2 pixels and compares times and energy
//
// Clusters >1 hit are accepted or rejected on a few criteria:
// >3 hits all rejected
// Clusters of 2 or 3 which are discontinuous (missing middle pixel) are rejected
// Clusters spanning 3 sectors are rejected as impossible
// Clusters spanning 3 rings and a single sector are accepted IF energy of middle segment is large enough
//
// Additionally clusters can be rejected if any of constituent hit is tagged as potential preamp-noise-crosstalk.
// This rules out many 3 hit events.
//
// Most of these rules favour clean spectra rather than efficiency, as currently noise dominates and addback events are not usable.
 
Int_t TSiLi::GetAddbackMultiplicity()
{
   // Automatically builds the addback hits using the addback_criterion (if the size of the addback_hits vector is zero)
   // and return the number of addback hits.
   int16_t basehits = GetMultiplicity();
 
   // if the addback has been reset, clear the addback hits
   if(fSiLiBits.TestBit(ESiLiBits::kAddbackSet)) {
      return fAddbackHits.size();
   }
   fAddbackHits.clear();
   fRejectHits.clear();
 
   if(basehits == 0) {
      fSiLiBits.SetBit(ESiLiBits::kAddbackSet, true);
      return 0;
   }
 
   //Do the addback if it hasnt been done
   if(fAddbackHits.empty() && fRejectHits.empty()) {
      //Check if any of the initial hits could be preamp noise induction
      std::vector<bool> fPreampRejectedHit(basehits, false);
      for(int i = 0; i < basehits; i++) {
         for(int j = i + 1; j < basehits; j++) {
            if(fRejectCriterion(GetSiLiHit(i), GetSiLiHit(j))) {
               fPreampRejectedHit[i] = true;
               fPreampRejectedHit[j] = true;
            }
         }
      }
 
      std::vector<unsigned>              clusters_id(basehits, 0);
      std::vector<std::vector<unsigned>> Clusters;
      std::vector<bool>                  hasreject;
 
      // In this loop we check all hits for pairing
      for(int i = 0; i < basehits; i++) {
         if(clusters_id[i] < 1) {   // If not yet paired start a new cluster
            std::vector<unsigned> newCluster(1, i);
            Clusters.push_back(newCluster);
            clusters_id[i] = Clusters.size();
            hasreject.push_back(fPreampRejectedHit[i]);
         }
         unsigned clus_id = clusters_id[i];
 
         for(int j = i + 1; j < basehits; j++) {
            if(fAddbackCriterion(GetSiLiHit(i), GetSiLiHit(j))) {
               Clusters[clus_id - 1].push_back(j);
               if(fPreampRejectedHit[j]) { hasreject[clus_id - 1] = true; }
               clusters_id[j] = clus_id;
            }
         }
      }
 
      // Clusters are lists of hit index that have been identified as coincident near neighbours
      // Will be length 1 if no neighbours.
      // AddCluster applies additional rules
      for(unsigned int i = 0; i < Clusters.size(); i++) {
         TSiLi::AddCluster(Clusters[i], hasreject[i]);
      }
 
      fSiLiBits.SetBit(ESiLiBits::kAddbackSet, true);
   }
 
   return fAddbackHits.size();
}
 
bool TSiLi::fAddbackCriterion(TSiLiHit* one, TSiLiHit* two)
{
   double e = one->GetEnergy() / two->GetEnergy();
   if(fCoincidenceTime(one, two)) {
      if(e > 0.05 && e < 50) {   // very basic energy gate to suppress noise issues
         int dring   = std::abs(one->GetRing() - two->GetRing());
         int dsector = std::abs(one->GetSector() - two->GetSector());
         if(dsector > 5) { dsector = 12 - dsector; }
 
         //if(dsector+dring==1)return true;
         //Changed to enable handing a missing middle pixel
         if(dsector + dring < 3) { return true; }
      }
   }
 
   return false;
}
 
// Intentionally no energy check as one of the two channels may have been calibrated to zero
// but we still want to know when they are coincident for this check.
bool TSiLi::fRejectCriterion(TSiLiHit* one, TSiLiHit* two)
{
   if(fCoincidenceTime(one, two)) {
      if(one->GetPreamp() == two->GetPreamp()) {
         if(std::abs(one->GetPin() - two->GetPin()) < 2) {
            return true;
         }
      }
   }
   return false;
}
 
bool TSiLi::fCoincidenceTime(TSiLiHit* one, TSiLiHit* two)
{
   double time = 0.;
   if(one->GetTimeFit() > 0 && two->GetTimeFit() > 0) {
      time = (one->GetTimeFit() - two->GetTimeFit()) * 10;
   } else {
      time = one->GetTime() - two->GetTime();
   }
 
   return std::abs(time) < fSiLiCoincidenceTime;
}
 
void TSiLi::AddCluster(std::vector<unsigned>& cluster, bool ContainsReject)
{
   if(cluster.empty()) { return; }
   if(!fRejectPossibleCrosstalk) { ContainsReject = false; }
 
   if(cluster.size() > 3) {
      ContainsReject = true;
   }
 
   if(cluster.size() > 1 && !ContainsReject) {
      TSiLiHit* A   = static_cast<TSiLiHit*>(GetHit(cluster[0]));
      TSiLiHit* B   = static_cast<TSiLiHit*>(GetHit(cluster[1]));
      int       rA  = A->GetRing();
      int       rB  = B->GetRing();
      int       sA  = A->GetSector();
      int       sB  = B->GetSector();
      int       rAB = std::abs(rA - rB);
      int       sAB = std::abs(sA - sB);
      if(sAB > 5) { sAB = 12 - sAB; }
 
      if(cluster.size() == 2) {
         //Reject events with missing middle pixel
         if(rAB + sAB > 1) { ContainsReject = true; }
      } else {
         TSiLiHit* C   = static_cast<TSiLiHit*>(GetHit(cluster[2]));
         int       rC  = C->GetRing();
         int       sC  = C->GetSector();
         int       rAC = std::abs(rA - rC);
         int       rBC = std::abs(rB - rC);
         int       sAC = std::abs(sA - sC);
         int       sBC = std::abs(sB - sC);
 
         if(sAC > 5) { sAC = 12 - sAC; }
         if(sBC > 5) { sBC = 12 - sBC; }
 
         if(rA == rB && rB == rC) {
            //Reject events that cross 3 sectors
            ContainsReject = true;
         } else if(rAB + sAB > 2 || rAC + sAC > 2 || rBC + sBC > 2) {
            //Reject events that are too far apart (1 or more missing middles)
            ContainsReject = true;
         } else {
            //Must be an allowed L OR 3 rings same sector
            if(sA == sB && sB == sC) {
               //if event crosses 3 rings
               double midE = 0.;
               if(((rA - rB) * (rA - rC)) < 0) {
                  midE = A->GetEnergy();
               } else if(((rB - rA) * (rB - rC)) < 0) {
                  midE = B->GetEnergy();
               } else {
                  midE = C->GetEnergy();
               }
 
               //Minimum possible energy
               if(midE < 1400) { ContainsReject = true; }
            }
         }
      }
   }
 
   if(ContainsReject) {
      for(unsigned int j : cluster) {
         fRejectHits.push_back(j);
      }
   } else {
      uint s = fAddbackHits.size();
      // We have to add it and THEN do the SumHit because the push_back copies the charge but not the energy,
      // which is the bit we sum
      // This is desired behaviour of TDetectorHit for speed of sorts, but messy for the addback, which should
      // only be done "on the fly" not stored to TSiLi on disk
      fAddbackHits.emplace_back();
      for(unsigned int j : cluster) {
         fAddbackHits[s].SumHit(GetSiLiHit(j));
      }
   }
   // Note: I got rid of ordering the cluster first.
   // There is really no way of knowing which is first for a double hits.
   // For a triple hit there are 2 possible & opposite orders, it would probably be best to take the middle. But why bother?
}
 
// Just a useful function for some dynamic tools
std::vector<TGraph> TSiLi::UpstreamShapes()
{
   std::vector<TGraph> ret;
 
   double inner_radius = fInnerDiameter / 2.0;
   double ring_width   = (fOuterDiameter - fInnerDiameter) * 0.5 / fRingNumber;   // radial width!
   double phi_width    = 2. * TMath::Pi() / fSectorNumber;
 
   for(int ring = 0; ring < fRingNumber; ring++) {
      double r1 = inner_radius + ring_width * ring;
      double r2 = r1 + ring_width;
 
      for(int sector = 0; sector < fSectorNumber; sector++) {
         double phi = (phi_width * sector) + fOffsetPhi - (0.5 * phi_width);
 
         TGraph G;
         for(int i = 0; i <= 10; i++) {
            double x = r1 * TMath::Cos(phi + i * (phi_width / 10.0));
            double y = r1 * TMath::Sin(phi + i * (phi_width / 10.0));
            G.SetPoint(G.GetN(), x, y);
         }
 
         for(int i = 10; i >= 0; i--) {
            double x = r2 * TMath::Cos(phi + i * (phi_width / 10.0));
            double y = r2 * TMath::Sin(phi + i * (phi_width / 10.0));
            G.SetPoint(G.GetN(), x, y);
         }
 
         G.SetPoint(G.GetN(), (r1)*TMath::Cos(phi), (r1)*TMath::Sin(phi));
 
         ret.push_back(G);
      }
   }
   return ret;
}