PndGeoDrc.cxx

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// PndGeoDrc
//
// Class for geometry of DRC (PandaRoot general case)
//
// Created 13/11/07 by A. Cecchi, Ferrara University 
// Modified by M.Patsyuk 2010-2013 m.patsyuk@gsi.de
//

#include "PndGeoDrc.h"
#include "FairGeoNode.h"

ClassImp(PndGeoDrc)

// -----   Default constructor   -------------------------------------------
PndGeoDrc::PndGeoDrc() {
  
  fName="drc";
  maxSectors=0;
  maxModules=20;
  
  // mean refraction index of fused silica (for reconstruction)
  fNquartz      = 1.47125;    //(1.47125 <==> 390nm)
  fUquartz      = 19.83;      // [cm/ns] group velocity in fused silica at lambda = 400 nm
  fNEV          = 1.47;       // oil ondex of refraction
  fRoughness    = 0.001;      // [nm] = 10A, roughness of the quartz bar surface
  fGlueLayer    = 0.0025;     // [cm]
  fGreaseLayer  = 0.05;       // [cm] grease layer between the MCP and the EV

  fRadius       = 47.6;       // [cm] Barrel radius
  fBarHalfThick = 1.75/2.0;   // [cm] bar half thickness
  fBarWidth     = 3.2;
  fBarBoxZDown  = 121.0;      // [cm] Downstream coordinate of radiator barrel
  fBarBoxZUp    =-119.0;      // [cm] Upstream coordinate of radiator barrel  
  fBarNum       = 5;          // Number of bars within barbox.
  fBoxGap       = 0.425;      // [cm] Gap between bar and bar box (only at the top and bottom of the bars)
  fBarhGap      = 0.01;       // [cm] Half gap between bars, =1 to have a realistic barbox thickness
  fBoxThick     = 0.2;        // [cm] Thickness of bar box
      
  fBarBoxNum    = 16;
  fBarBoxGap    = 2.48;       // [cm] gap between neighboring bar boxes
  fPipehAngle   = 3.4;        // [degrees] half of the angle taken by the target pipe
  fBarBoxAngle  = 21.65;
  
  // parameters of the EV:
  fEVlength     = 30.;        // [cm] Length of expansion volume
  fEVdrop       = 0; //-(fBoxThick+fBoxGap);   // [cm] drop of the EV - inner radius (used only with prism)
  fEVoffset     = 0;          // [cm] offset of the EV - outer radius  
  fEVbackAngle  = 90.;        // [degrees] angle between the PD surface and the Z axis, default = 90.
  
  // prism parameters:
  fPhLength     =  4.5;       // [cm] half length of the prism
  fPAngle       =  30.;       // [degrees] opening angle of the prism
  fPDrop        =  0;         // [cm] drop of the prism - inner side
  fPOffset      =  1.;        // [cm] offset of the prism - outer side 
  
  // MCP parameters:
  fMCPsize      = 5.9;        // [cm] for geometry Mcp2 and Mcp1, = 5.78 for geometry Mcp2a
  fMCPactiveArea= 5.3;        // [cm] 
  fMCPgap       = 0.01;       // [cm] gap between MCPs
  fNpix         = 8;          // [cm] number of pixel in one column/row for one MCP (8 x 8)
  fPixelSize    = 0.65;       // [cm] 
  fSigmaCharge  = 0.03;       // [cm] = 1 mm, sigma of the charge sharing
  fDeadTime     = 0.0  ;      // [ns] dead time of the photodetector
  
  fPi            =  TMath::Pi();
  fLside        = 2.*fRadius*TMath::Sin((fBarBoxAngle-fBarBoxGap)/180.*fPi/2.)+2.*fBarhGap;
    
 }
// -------------------------------------------------------------------------

const char* PndGeoDrc::getModuleName(Int_t m) {
  // Returns the module name of drc number m
  if ( m < 9 ) sprintf(modName,"drc0%i",m+1);
  else sprintf(modName,"drc%i",m+1);
  return modName;
}

const char* PndGeoDrc::getEleName(Int_t m) {
  // // Returns the element name of drc number m
  if ( m < 9 ) sprintf(eleName,"drc0%i",m+1);
  else sprintf(eleName,"drc%i",m+1);
  return eleName;
}