[u/mrichter/AliRoot.git] / ITS / AliITSsimulationFastPoints.cxx

/**************************************************************************
 * 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 1.6  2000/10/29 18:30:14  barbera
Z resolution of pixel changed according with the default lenght of 425 microns

Revision 1.1.2.6  2000/10/29 18:29:51  barbera
Z resolution of pixel changed according with the default lenght of 425 microns

Revision 1.1.2.5  2000/10/02 16:03:20  barbera
Forward declarations added

Revision 1.4  2000/09/22 12:43:59  nilsen
Default track number set to -3 and not 0.

*/
#include <TRandom.h>

#include "AliITS.h"
#include "AliITShit.h"
#include "AliITSRecPoint.h"
#include "AliITSmodule.h"
#include "AliITSgeom.h"
#include "AliRun.h"
#include "AliITSsimulationFastPoints.h"


ClassImp(AliITSsimulationFastPoints)

AliITSsimulationFastPoints::AliITSsimulationFastPoints()
{
  //constructor
  fSigmaRPhi[0] = fSigmaRPhi[1] = 12e-4;
  fSigmaRPhi[2] = fSigmaRPhi[3] = 38e-4;
  fSigmaRPhi[4] = fSigmaRPhi[5] = 20e-4;
  fSigmaZ[0] = fSigmaZ[1] = 120e-4;        // resolution for 425 micron pixels
  fSigmaZ[2] = fSigmaZ[3] = 28e-4;
  fSigmaZ[4] = fSigmaZ[5] = 830e-4;
  fSigmaDe[0] = fSigmaDe[1] = 0.72e-6;
  fSigmaDe[2] = fSigmaDe[3] = 0.90e-6;
  fSigmaDe[4] = fSigmaDe[5] =  5e-6;
  fThrDe[0] = fThrDe[1] = 7.2e-6;
  fThrDe[2] = fThrDe[3] = 2.70e-6;
  fThrDe[4] = fThrDe[5] = 10e-6;
}

//-------------------------------------------------------------
void AliITSsimulationFastPoints::CreateFastRecPoints(AliITSmodule *mod, Int_t module, TRandom *random){
  // Fast points simulator 

   AliITS *aliITS  = (AliITS*)gAlice->GetModule("ITS");
   AliITSgeom *gm = aliITS->GetITSgeom();

   const Float_t kdEdXtoQ = 2.778e+8; 

   Int_t ihit,flag,numofhits;
   Float_t xg,yg,zg,xl,yl,zl;
   Float_t px,py,pz;
   //Double_t p, theta, pt, ps;
   Float_t locals[3];
   Float_t globals[3];
   //Float_t xg1,yg1,zg1;
   Double_t sigmarphi=0., sigmaz=0., sigmade=0., thrde=0.;
   Float_t deltaXl,deltaZl,deltaDe;

   Int_t hitlay, hitlad, hitdet, hitstatus, hittrack;
   Float_t hitx, hity, hitz, hitpx, hitpy, hitpz, hitdestep;
   

   Int_t   hitstatus1, hittrack1;
   Float_t hitx1, hity1, hitz1;
   Float_t hitdestep1;

   Float_t xMg,yMg,zMg;
   //Float_t dx,dy,dz,ds;


   numofhits = mod->GetNhits();
   //printf("numofhits %d \n",numofhits);
   flag = 1;
   for(ihit=0;ihit<numofhits;ihit++){
     AliITShit *hit=mod->GetHit(ihit);
     hit->GetPositionG(hitx1,hity1,hitz1);
     hitstatus1 = hit->GetTrackStatus();
     hitdestep1 = hit->GetIonization();

     hittrack1 = hit->GetTrack();

     mod->MedianHit(module,hitx1,hity1,hitz1,hitstatus1,xMg,yMg,zMg,flag);
     if (flag!=1) {
       hitx      = xMg;
       hity      = yMg;
       hitz      = zMg;
       hit->GetDetectorID(hitlay,hitlad,hitdet);
       hit->GetMomentumG(hitpx,hitpy,hitpz);            
       hitdestep = hit->GetIonization();
       hitstatus = hitstatus1;
       hittrack  = hit->GetTrack();

       if (hitdestep > 0) {
	   xg = hitx;
	   yg = hity;
	   zg = hitz;
           // Transform to the module local frame
	   globals[0] = hitx;
	   globals[1] = hity;
	   globals[2] = hitz;
	   gm->GtoL(hitlay,hitlad,hitdet,globals,locals);
	   xl = locals[0];
	   yl = locals[1];
	   zl = locals[2];
	   px = hitpx;
	   py = hitpy;
	   pz = hitpz;
	   /*
           // Calculate transverse momentum and pseudorapidity
           // to allow pt and eta dependence in sigma values
           // of the spatial resolution
	   p  = TMath::Sqrt((px*px)+(py*py)+(pz*pz));
	   theta = TMath::ACos(pz/p);
	   pt = p * TMath::Sin(theta);
	   ps = -TMath::Log(TMath::Tan(theta/2));
	   */

           // Retrieve sigma values for position and energy, and energy
           // threshold 
	   
	   sigmarphi = SigmaRPhi(hitlay);
	   sigmaz = SigmaZ(hitlay);
	   sigmade = SigmaDe(hitlay);
	   thrde = ThrDe(hitlay);
	   // Randomize position and deposited energy
           Int_t k=3*(Int_t)((hitlay-1)/2);

	   deltaXl = (float)(random[k].Gaus(0,sigmarphi));
	   deltaZl = (float)(random[k+1].Gaus(0,sigmaz));
	   deltaDe = (float)(random[k+2].Gaus(0,sigmade));
           // Apply energy threshold and trasform back to global reference 
           // system

	   if ( (hitdestep+deltaDe) > thrde ){
	       locals[0] = xl + deltaXl;
	       locals[1] = yl;
	       locals[2] = zl + deltaZl;
	       AliITSRecPoint rp;
	       rp.fTracks[0]=hittrack;
	       rp.fTracks[1]=-3;
	       rp.fTracks[2]=-3;
	       rp.SetX(locals[0]);
	       rp.SetZ(locals[2]);
	       rp.SetdEdX(hitdestep+deltaDe);
	       rp.SetQ(kdEdXtoQ*(hitdestep+deltaDe));  // number of e
	       rp.SetSigmaX2(sigmarphi*sigmarphi);
	       rp.SetSigmaZ2(sigmaz*sigmaz);
	       aliITS->AddRecPoint(rp);
	       /*
	       gm->LtoG(hitlay,hitlad,hitdet,locals,globals);
	       xg1 = globals[0];
	       yg1 = globals[1];
	       zg1 = globals[2];
	       dx = TMath::Abs(xg1-hitx);
	       dy = TMath::Abs(yg1-hity);
	       dz = TMath::Abs(zg1-hitz);
	       ds = TMath::Abs(deltaDe);
	       */
	   } // if ( (hitdestep+deltaDe)
	   else flag=1;
       } // if (hitdestep > 0)
       else flag=1;
     } // if (flag!=1)
   }   

}
//_______________________________________________________________________
void AliITSsimulationFastPoints::SetSigmaRPhi(Double_t  srphi[6])
{
  // set sigmas in rphi

    Int_t i;
    for (i=0; i<6; i++) {
	fSigmaRPhi[i]=srphi[i];
    }
}
//_______________________________________________________________________
void AliITSsimulationFastPoints::SetSigmaZ(Double_t  sz[6])
{
  // set sigmas in z

    Int_t i;
    for (i=0; i<6; i++) {
	fSigmaZ[i]=sz[i];
    }
}
//_______________________________________________________________________
void AliITSsimulationFastPoints::SetSigmaDe(Double_t  sde[6])
{
  // set sigmas in energy

    Int_t i;
    for (i=0; i<6; i++) {
	fSigmaDe[i]=sde[i];
    }
}
//_______________________________________________________________________
void AliITSsimulationFastPoints::SetThrDe(Double_t  thrde[6])
{
  // set energy thersholds

    Int_t i;
    for (i=0; i<6; i++) {
	fThrDe[i]=thrde[i];
    }
}
Commit	Line	Data
b0f5e3fc	1	/**************************************************************************
	2	* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
	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	/*
	17	$Log$
34980f24	18	Revision 1.6 2000/10/29 18:30:14 barbera
	19	Z resolution of pixel changed according with the default lenght of 425 microns
	20
21d3c626	21	Revision 1.1.2.6 2000/10/29 18:29:51 barbera
	22	Z resolution of pixel changed according with the default lenght of 425 microns
	23
1ca7869b	24	Revision 1.1.2.5 2000/10/02 16:03:20 barbera
	25	Forward declarations added
	26
	27	Revision 1.4 2000/09/22 12:43:59 nilsen
	28	Default track number set to -3 and not 0.
	29
b0f5e3fc	30	*/
e8189707	31	#include <TRandom.h>
b0f5e3fc	32
b0f5e3fc	33	#include "AliITS.h"
517784f0	34	#include "AliITShit.h"
	35	#include "AliITSRecPoint.h"
	36	#include "AliITSmodule.h"
	37	#include "AliITSgeom.h"
e8189707	38	#include "AliRun.h"
b0f5e3fc	39	#include "AliITSsimulationFastPoints.h"
e8189707	40
b0f5e3fc	41
	42	ClassImp(AliITSsimulationFastPoints)
	43
	44	AliITSsimulationFastPoints::AliITSsimulationFastPoints()
	45	{
	46	//constructor
e8189707	47	fSigmaRPhi[0] = fSigmaRPhi[1] = 12e-4;
	48	fSigmaRPhi[2] = fSigmaRPhi[3] = 38e-4;
	49	fSigmaRPhi[4] = fSigmaRPhi[5] = 20e-4;
21d3c626	50	fSigmaZ[0] = fSigmaZ[1] = 120e-4; // resolution for 425 micron pixels
e8189707	51	fSigmaZ[2] = fSigmaZ[3] = 28e-4;
	52	fSigmaZ[4] = fSigmaZ[5] = 830e-4;
	53	fSigmaDe[0] = fSigmaDe[1] = 0.72e-6;
	54	fSigmaDe[2] = fSigmaDe[3] = 0.90e-6;
	55	fSigmaDe[4] = fSigmaDe[5] = 5e-6;
	56	fThrDe[0] = fThrDe[1] = 7.2e-6;
	57	fThrDe[2] = fThrDe[3] = 2.70e-6;
	58	fThrDe[4] = fThrDe[5] = 10e-6;
b0f5e3fc	59	}
b0f5e3fc	60
e8189707	61	//-------------------------------------------------------------
	62	void AliITSsimulationFastPoints::CreateFastRecPoints(AliITSmodule mod, Int_t module, TRandom random){
	63	// Fast points simulator
	64
	65	AliITS aliITS = (AliITS)gAlice->GetModule("ITS");
	66	AliITSgeom *gm = aliITS->GetITSgeom();
	67
	68	const Float_t kdEdXtoQ = 2.778e+8;
	69
	70	Int_t ihit,flag,numofhits;
	71	Float_t xg,yg,zg,xl,yl,zl;
	72	Float_t px,py,pz;
	73	//Double_t p, theta, pt, ps;
	74	Float_t locals[3];
	75	Float_t globals[3];
	76	//Float_t xg1,yg1,zg1;
	77	Double_t sigmarphi=0., sigmaz=0., sigmade=0., thrde=0.;
	78	Float_t deltaXl,deltaZl,deltaDe;
	79
	80	Int_t hitlay, hitlad, hitdet, hitstatus, hittrack;
	81	Float_t hitx, hity, hitz, hitpx, hitpy, hitpz, hitdestep;
	82
	83
	84	Int_t hitstatus1, hittrack1;
	85	Float_t hitx1, hity1, hitz1;
	86	Float_t hitdestep1;
	87
	88	Float_t xMg,yMg,zMg;
	89	//Float_t dx,dy,dz,ds;
	90
	91
	92	numofhits = mod->GetNhits();
34980f24	93	//printf("numofhits %d \n",numofhits);
e8189707	94	flag = 1;
	95	for(ihit=0;ihit<numofhits;ihit++){
	96	AliITShit *hit=mod->GetHit(ihit);
	97	hit->GetPositionG(hitx1,hity1,hitz1);
	98	hitstatus1 = hit->GetTrackStatus();
	99	hitdestep1 = hit->GetIonization();
	100
	101	hittrack1 = hit->GetTrack();
	102
	103	mod->MedianHit(module,hitx1,hity1,hitz1,hitstatus1,xMg,yMg,zMg,flag);
	104	if (flag!=1) {
	105	hitx = xMg;
	106	hity = yMg;
	107	hitz = zMg;
	108	hit->GetDetectorID(hitlay,hitlad,hitdet);
	109	hit->GetMomentumG(hitpx,hitpy,hitpz);
	110	hitdestep = hit->GetIonization();
	111	hitstatus = hitstatus1;
	112	hittrack = hit->GetTrack();
	113
	114	if (hitdestep > 0) {
	115	xg = hitx;
	116	yg = hity;
	117	zg = hitz;
	118	// Transform to the module local frame
	119	globals[0] = hitx;
	120	globals[1] = hity;
	121	globals[2] = hitz;
	122	gm->GtoL(hitlay,hitlad,hitdet,globals,locals);
	123	xl = locals[0];
	124	yl = locals[1];
	125	zl = locals[2];
	126	px = hitpx;
	127	py = hitpy;
	128	pz = hitpz;
	129	/*
	130	// Calculate transverse momentum and pseudorapidity
	131	// to allow pt and eta dependence in sigma values
	132	// of the spatial resolution
	133	p = TMath::Sqrt((pxpx)+(pypy)+(pz*pz));
	134	theta = TMath::ACos(pz/p);
	135	pt = p * TMath::Sin(theta);
	136	ps = -TMath::Log(TMath::Tan(theta/2));
	137	*/
	138
	139	// Retrieve sigma values for position and energy, and energy
	140	// threshold
	141
	142	sigmarphi = SigmaRPhi(hitlay);
	143	sigmaz = SigmaZ(hitlay);
	144	sigmade = SigmaDe(hitlay);
	145	thrde = ThrDe(hitlay);
	146	// Randomize position and deposited energy
	147	Int_t k=3*(Int_t)((hitlay-1)/2);
	148
	149	deltaXl = (float)(random[k].Gaus(0,sigmarphi));
	150	deltaZl = (float)(random[k+1].Gaus(0,sigmaz));
	151	deltaDe = (float)(random[k+2].Gaus(0,sigmade));
	152	// Apply energy threshold and trasform back to global reference
	153	// system
517784f0	154
e8189707	155	if ( (hitdestep+deltaDe) > thrde ){
	156	locals[0] = xl + deltaXl;
	157	locals[1] = yl;
	158	locals[2] = zl + deltaZl;
	159	AliITSRecPoint rp;
	160	rp.fTracks[0]=hittrack;
517784f0	161	rp.fTracks[1]=-3;
517784f0	162	rp.fTracks[2]=-3;
e8189707	163	rp.SetX(locals[0]);
	164	rp.SetZ(locals[2]);
	165	rp.SetdEdX(hitdestep+deltaDe);
	166	rp.SetQ(kdEdXtoQ*(hitdestep+deltaDe)); // number of e
	167	rp.SetSigmaX2(sigmarphi*sigmarphi);
	168	rp.SetSigmaZ2(sigmaz*sigmaz);
e8189707	169	aliITS->AddRecPoint(rp);
	170	/*
	171	gm->LtoG(hitlay,hitlad,hitdet,locals,globals);
	172	xg1 = globals[0];
	173	yg1 = globals[1];
	174	zg1 = globals[2];
	175	dx = TMath::Abs(xg1-hitx);
	176	dy = TMath::Abs(yg1-hity);
	177	dz = TMath::Abs(zg1-hitz);
	178	ds = TMath::Abs(deltaDe);
	179	*/
	180	} // if ( (hitdestep+deltaDe)
	181	else flag=1;
	182	} // if (hitdestep > 0)
	183	else flag=1;
	184	} // if (flag!=1)
	185	}
b0f5e3fc	186
b0f5e3fc	187	}
e8189707	188	//_______________________________________________________________________
	189	void AliITSsimulationFastPoints::SetSigmaRPhi(Double_t srphi[6])
	190	{
	191	// set sigmas in rphi
b0f5e3fc	192
e8189707	193	Int_t i;
	194	for (i=0; i<6; i++) {
	195	fSigmaRPhi[i]=srphi[i];
	196	}
b0f5e3fc	197	}
b0f5e3fc	198	//_______________________________________________________________________
e8189707	199	void AliITSsimulationFastPoints::SetSigmaZ(Double_t sz[6])
	200	{
	201	// set sigmas in z
	202
	203	Int_t i;
	204	for (i=0; i<6; i++) {
	205	fSigmaZ[i]=sz[i];
	206	}
b0f5e3fc	207	}
b0f5e3fc	208	//_______________________________________________________________________
e8189707	209	void AliITSsimulationFastPoints::SetSigmaDe(Double_t sde[6])
	210	{
	211	// set sigmas in energy
	212
	213	Int_t i;
	214	for (i=0; i<6; i++) {
	215	fSigmaDe[i]=sde[i];
	216	}
b0f5e3fc	217	}
b0f5e3fc	218	//_______________________________________________________________________
e8189707	219	void AliITSsimulationFastPoints::SetThrDe(Double_t thrde[6])
	220	{
	221	// set energy thersholds
	222
	223	Int_t i;
	224	for (i=0; i<6; i++) {
	225	fThrDe[i]=thrde[i];
	226	}
b0f5e3fc	227	}
e8189707	228