[u/mrichter/AliRoot.git] / EVGEN / AliGenFLUKAsource.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.                  *
 **************************************************************************/

/* $Id$ */

// Read background particles from a FLUKA boundary source file
// This is a very special generator that works for background studies for the muon-spectrometer.
// The input files come from FLUKA simulations.
// Files can be chained. 
// Author: andreas.morsch@cern.ch

#include "TPDGCode.h"
#include "TDatabasePDG.h"

#include "AliGenFLUKAsource.h"
#include "AliRun.h"


#include <TFile.h>
#include <TTree.h>
#include <TChain.h>
#include <stdlib.h>
ClassImp(AliGenFLUKAsource)

AliGenFLUKAsource::AliGenFLUKAsource()
	 :AliGenerator(-1)
{
    // Constructor
    fName="FLUKA";
    fTitle="FLUKA Boundary Source";
    // Read in all particle types by default
    fIkine=6;
    // Set maximum admitted age of particles to 1.e-05 by default 
    fAgeMax=1.e-05;
    // Do not add weight
    fAddWeight=1.;
    // Shift the z-coordinate of the impact point by 4.5 cm only if it reads 
    // from  specific boundary source to the chamber (fZshift=4.5;),else there 
    // is no need to shift as it reads boundary source for the whole volume of 
    // the Muon Arm; the default value corresponds to boundary source for the
    // whole volume of the MUON Arm 
    fZshift=0;
    // Set the default file 
    fFileName="";

    fTreeFluka=0;
    fTreeChain = new TChain("h1");
//
//  Read all particles
    fNpart=-1;
}

AliGenFLUKAsource::AliGenFLUKAsource(Int_t npart)
    :AliGenerator(npart)
{
    // Constructor
    fName  = "FLUKA";
    fTitle = "FLUKA Boundary Source";
    // Read in all particle types by default
    fIkine=6;
    // Set maximum admitted age of particles to 1.e-05 by default 
    fAgeMax=1.e-05;
    // Do not add weight
    fAddWeight=1.;
    // Shift the z-coordinate of the impact point by 4.5 cm only if it reads 
    // from  specific boundary source to the chamber (fZshift=4.5;),else there 
    // is no need to shift as it reads boundary source for the whole volume of 
    // the Muon Arm; the default value corresponds to boundary source for the
    // whole volume of the MUON Arm 
    fZshift=0;
    // Set the default file 
    fFileName="";

    fTreeFluka=0;
    fTreeChain = new TChain("h1"); 
    fSourceId=-1;
}

AliGenFLUKAsource::AliGenFLUKAsource(const AliGenFLUKAsource & FLUKAsource):
    AliGenerator(FLUKAsource)
{
// Copy constructor
    FLUKAsource.Copy(*this);
}


//____________________________________________________________
AliGenFLUKAsource::~AliGenFLUKAsource()
{
// Destructor
 if (fTreeFluka) delete fTreeFluka;
 if (fTreeChain) delete fTreeChain;
}

void AliGenFLUKAsource::AddFile(const Text_t *filename)
{
// Add a file to the chain
    fTreeChain->Add(filename);
    
}


//____________________________________________________________
void AliGenFLUKAsource::FlukaInit() 
{
// Set branch addresses of data entries
    TChain *h2=fTreeChain;
//Set branch addresses
    h2->SetBranchAddress("Ip",&fIp);
    h2->SetBranchAddress("Ipp",&fIpp);
    h2->SetBranchAddress("Xi",&fXi);
    h2->SetBranchAddress("Yi",&fYi);
    h2->SetBranchAddress("Zi",&fZi);
    h2->SetBranchAddress("Px",&fPx);
    h2->SetBranchAddress("Py",&fPy);
    h2->SetBranchAddress("Pz",&fPz);
    h2->SetBranchAddress("Ekin",&fEkin);
    h2->SetBranchAddress("Zv",&fZv);
    h2->SetBranchAddress("Rv",&fRv);
    h2->SetBranchAddress("Itra",&fItra);
    h2->SetBranchAddress("Igas",&fIgas);
    h2->SetBranchAddress("Wgt",&fWgt);
    h2->SetBranchAddress("Etag",&fEtag);
    h2->SetBranchAddress("Ptg",&fPtg);
    h2->SetBranchAddress("Age",&fAge);
}

//____________________________________________________________
void AliGenFLUKAsource::Generate()
{
// Generate one event 

    const Int_t kIfluge[28]={kProton, kProtonBar, kElectron, kPositron,
			  kNuE, kNuEBar, kGamma, kNeutron, kNeutronBar,
			  kMuonPlus, kMuonMinus, kK0Long , kPiPlus, kPiMinus,
			  kKPlus, kKMinus, kLambda0, kLambda0Bar, kK0Short,
			  kSigmaMinus, kSigmaPlus, kSigma0, kPi0, kK0, kK0Bar,
			  0,kNuMu,kNuMuBar};
    Float_t polar[3]= {0,0,0};
  //
    Float_t origin[3];
    Float_t p[3];
    Float_t prwn;
    Float_t wgt, fwgt;
    Float_t phi;
    Float_t amass;
    Int_t iwgt;
    Int_t i, j, part, nt;
    static Int_t irwn=0;
    //
    Float_t random[2];
  //
    FlukaInit();
    TChain *h2=fTreeChain;
    Int_t nentries = (Int_t) h2->GetEntries();
    if (fNpart == -1) fNpart=Int_t(nentries*fFrac);
    

  // loop over number of particles
    Int_t nb=0;
    Int_t ev=gMC->CurrentEvent();
    for (i=0; i<fNpart;i++) {
	Int_t entry=fNpart*(ev-1)+i; 
	nb = (Int_t)h2->GetEvent(entry); 
	if (irwn > nentries) {
	    printf("No more entries in the FLUKA boundary source file\n");
	    TFile *pFile=0;
	    // Get AliRun object or create it 
	    if (!gAlice) {
		gAlice = (AliRun*)pFile->Get("gAlice");
		if (gAlice) printf("AliRun object found on file\n");
		if (!gAlice) gAlice = new AliRun("gAlice","Alice test program");
	    }
	    TTree *fAli=gAlice->TreeK();
	    if (fAli) pFile =fAli->GetCurrentFile();
	    pFile->cd();
	    printf("Generate - I'm out \n");
	    return;
	}   
	
	Int_t ifip = Int_t(fIp);
	

	if (fSourceId != -1 && fIgas !=fSourceId) {
	    irwn++;
	    continue;
	}
	
	if (ifip > 28 || ifip < 0) {
	    irwn++;
	    continue;
	}
	
	if ((ifip != fIkine && fIkine != kAll && fIkine != kCharged 
	     && fIkine != 10) || fAge > fAgeMax){
	    irwn++;
	    continue;
	} else if (fIkine == kCharged) {
	    if (ifip == 7 || ifip == 8 || fAge > fAgeMax) { 
		irwn++;
		continue;
	    }
	} else if (fIkine == kNoNeutron) {
	    if (ifip == 8 || fAge > fAgeMax) { 
		irwn++;
		continue;
	    }
	}
    

	irwn++;
//
// PDG code from FLUKA particle type (ifip)
	part=kIfluge[int(ifip)-1];	
//
// Calculate momentum from kinetic energy and mass of the particle
	amass = (TDatabasePDG::Instance())->GetParticle(part)->Mass();

	prwn=fEkin*sqrt(1. + 2.*amass/fEkin);


	origin[0]=fYi;
	origin[1]=fXi;
	origin[2]=fZi;
	
	p[0]=fPy*prwn;
	p[1]=fPx*prwn;
	p[2]=fPz*prwn;

	//handle particle weight correctly
	wgt = (part == 13) ? fWgt*fAddWeight : fWgt;
	iwgt=Int_t(wgt);
	fwgt=wgt-Float_t(iwgt);
	Rndm(random,2);
	if (random[0] < fwgt) iwgt++;
	if (part==1 && iwgt>100) iwgt=100;
	Int_t nstack=0;
	for (j=0; j<iwgt; j++) {
	    PushTrack(fTrackIt,-1,part,p,origin,polar,fAge,kPPrimary,nt);
	    Rndm(random,2);
	    phi=2*random[1]*TMath::Pi();
	    Float_t pn1=p[0]*TMath::Sin(phi) - p[1]*TMath::Cos(phi);
	    Float_t pn2=p[0]*TMath::Cos(phi) + p[1]*TMath::Sin(phi);
	    p[0]=pn1;
	    p[1]=pn2;
	    Float_t on1=origin[0]*TMath::Sin(phi)-origin[1]*TMath::Cos(phi);
	    Float_t on2=origin[0]*TMath::Cos(phi)+origin[1]*TMath::Sin(phi);
	    origin[0]=on1;
	    origin[1]=on2;
	    nstack++;
	}
	if (nstack == 0) continue;
    }
    
    TFile *pFile=0;
// Get AliRun object or create it 
    if (!gAlice) {
	gAlice = (AliRun*)pFile->Get("gAlice");
	if (gAlice) printf("AliRun object found on file\n");
	if (!gAlice) gAlice = new AliRun("gAlice","Alice test program");
    }
    TTree *fAli=gAlice->TreeK();
    if (fAli) pFile =fAli->GetCurrentFile();
    pFile->cd();
}


AliGenFLUKAsource& AliGenFLUKAsource::operator=(const  AliGenFLUKAsource& rhs)
{
// Assignment operator
    rhs.Copy(*this);
    return (*this);
}


void AliGenFLUKAsource::Copy(AliGenFLUKAsource &) const
{
    Fatal("Copy","Not implemented!\n");
}
Commit	Line	Data
4c039060	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
88cb7938	16	/* $Id$ */
675e9664	17
	18	// Read background particles from a FLUKA boundary source file
	19	// This is a very special generator that works for background studies for the muon-spectrometer.
	20	// The input files come from FLUKA simulations.
	21	// Files can be chained.
	22	// Author: andreas.morsch@cern.ch
	23
116cbefd	24	#include "TPDGCode.h"
d3ee5d3d	25	#include "TDatabasePDG.h"
116cbefd	26
fe4da5cc	27	#include "AliGenFLUKAsource.h"
fe4da5cc	28	#include "AliRun.h"
5c3fd7ea	29
5c3fd7ea	30
fe4da5cc	31	#include <TFile.h>
fe4da5cc	32	#include <TTree.h>
f87cfe57	33	#include <TChain.h>
fe4da5cc	34	#include <stdlib.h>
198bb1c7	35	ClassImp(AliGenFLUKAsource)
	36
	37	AliGenFLUKAsource::AliGenFLUKAsource()
fe4da5cc	38	:AliGenerator(-1)
fe4da5cc	39	{
f87cfe57	40	// Constructor
fe4da5cc	41	fName="FLUKA";
	42	fTitle="FLUKA Boundary Source";
	43	// Read in all particle types by default
	44	fIkine=6;
	45	// Set maximum admitted age of particles to 1.e-05 by default
	46	fAgeMax=1.e-05;
	47	// Do not add weight
	48	fAddWeight=1.;
	49	// Shift the z-coordinate of the impact point by 4.5 cm only if it reads
	50	// from specific boundary source to the chamber (fZshift=4.5;),else there
	51	// is no need to shift as it reads boundary source for the whole volume of
	52	// the Muon Arm; the default value corresponds to boundary source for the
	53	// whole volume of the MUON Arm
	54	fZshift=0;
	55	// Set the default file
09d89034	56	fFileName="";
fe4da5cc	57
fe4da5cc	58	fTreeFluka=0;
886b6f73	59	fTreeChain = new TChain("h1");
fe4da5cc	60	//
	61	// Read all particles
	62	fNpart=-1;
fe4da5cc	63	}
	64
	65	AliGenFLUKAsource::AliGenFLUKAsource(Int_t npart)
	66	:AliGenerator(npart)
	67	{
f87cfe57	68	// Constructor
675e9664	69	fName = "FLUKA";
675e9664	70	fTitle = "FLUKA Boundary Source";
fe4da5cc	71	// Read in all particle types by default
	72	fIkine=6;
	73	// Set maximum admitted age of particles to 1.e-05 by default
	74	fAgeMax=1.e-05;
	75	// Do not add weight
	76	fAddWeight=1.;
	77	// Shift the z-coordinate of the impact point by 4.5 cm only if it reads
	78	// from specific boundary source to the chamber (fZshift=4.5;),else there
	79	// is no need to shift as it reads boundary source for the whole volume of
	80	// the Muon Arm; the default value corresponds to boundary source for the
	81	// whole volume of the MUON Arm
	82	fZshift=0;
	83	// Set the default file
09d89034	84	fFileName="";
fe4da5cc	85
fe4da5cc	86	fTreeFluka=0;
886b6f73	87	fTreeChain = new TChain("h1");
f87cfe57	88	fSourceId=-1;
fe4da5cc	89	}
fe4da5cc	90
198bb1c7	91	AliGenFLUKAsource::AliGenFLUKAsource(const AliGenFLUKAsource & FLUKAsource):
198bb1c7	92	AliGenerator(FLUKAsource)
f87cfe57	93	{
198bb1c7	94	// Copy constructor
198bb1c7	95	FLUKAsource.Copy(*this);
f87cfe57	96	}
	97
	98
fe4da5cc	99	//____________________________________________________________
	100	AliGenFLUKAsource::~AliGenFLUKAsource()
	101	{
f87cfe57	102	// Destructor
886b6f73	103	if (fTreeFluka) delete fTreeFluka;
886b6f73	104	if (fTreeChain) delete fTreeChain;
fe4da5cc	105	}
fe4da5cc	106
886b6f73	107	void AliGenFLUKAsource::AddFile(const Text_t *filename)
fe4da5cc	108	{
f87cfe57	109	// Add a file to the chain
886b6f73	110	fTreeChain->Add(filename);
fe4da5cc	111
886b6f73	112	}
886b6f73	113
fe4da5cc	114
886b6f73	115	//____________________________________________________________
	116	void AliGenFLUKAsource::FlukaInit()
	117	{
f87cfe57	118	// Set branch addresses of data entries
886b6f73	119	TChain *h2=fTreeChain;
fe4da5cc	120	//Set branch addresses
f87cfe57	121	h2->SetBranchAddress("Ip",&fIp);
	122	h2->SetBranchAddress("Ipp",&fIpp);
	123	h2->SetBranchAddress("Xi",&fXi);
	124	h2->SetBranchAddress("Yi",&fYi);
	125	h2->SetBranchAddress("Zi",&fZi);
	126	h2->SetBranchAddress("Px",&fPx);
	127	h2->SetBranchAddress("Py",&fPy);
	128	h2->SetBranchAddress("Pz",&fPz);
	129	h2->SetBranchAddress("Ekin",&fEkin);
	130	h2->SetBranchAddress("Zv",&fZv);
	131	h2->SetBranchAddress("Rv",&fRv);
	132	h2->SetBranchAddress("Itra",&fItra);
	133	h2->SetBranchAddress("Igas",&fIgas);
	134	h2->SetBranchAddress("Wgt",&fWgt);
	135	h2->SetBranchAddress("Etag",&fEtag);
	136	h2->SetBranchAddress("Ptg",&fPtg);
	137	h2->SetBranchAddress("Age",&fAge);
fe4da5cc	138	}
	139
	140	//____________________________________________________________
	141	void AliGenFLUKAsource::Generate()
f87cfe57	142	{
f87cfe57	143	// Generate one event
fe4da5cc	144
f87cfe57	145	const Int_t kIfluge[28]={kProton, kProtonBar, kElectron, kPositron,
1578254f	146	kNuE, kNuEBar, kGamma, kNeutron, kNeutronBar,
	147	kMuonPlus, kMuonMinus, kK0Long , kPiPlus, kPiMinus,
	148	kKPlus, kKMinus, kLambda0, kLambda0Bar, kK0Short,
	149	kSigmaMinus, kSigmaPlus, kSigma0, kPi0, kK0, kK0Bar,
	150	0,kNuMu,kNuMuBar};
886b6f73	151	Float_t polar[3]= {0,0,0};
fe4da5cc	152	//
886b6f73	153	Float_t origin[3];
	154	Float_t p[3];
	155	Float_t prwn;
	156	Float_t wgt, fwgt;
	157	Float_t phi;
d3ee5d3d	158	Float_t amass;
886b6f73	159	Int_t iwgt;
886b6f73	160	Int_t i, j, part, nt;
e7bafa6d	161	static Int_t irwn=0;
886b6f73	162	//
886b6f73	163	Float_t random[2];
fe4da5cc	164	//
886b6f73	165	FlukaInit();
	166	TChain *h2=fTreeChain;
	167	Int_t nentries = (Int_t) h2->GetEntries();
	168	if (fNpart == -1) fNpart=Int_t(nentries*fFrac);
09d89034	169
09d89034	170
fe4da5cc	171	// loop over number of particles
886b6f73	172	Int_t nb=0;
cfce8870	173	Int_t ev=gMC->CurrentEvent();
886b6f73	174	for (i=0; i<fNpart;i++) {
	175	Int_t entry=fNpart*(ev-1)+i;
	176	nb = (Int_t)h2->GetEvent(entry);
	177	if (irwn > nentries) {
	178	printf("No more entries in the FLUKA boundary source file\n");
f87cfe57	179	TFile *pFile=0;
886b6f73	180	// Get AliRun object or create it
886b6f73	181	if (!gAlice) {
f87cfe57	182	gAlice = (AliRun*)pFile->Get("gAlice");
886b6f73	183	if (gAlice) printf("AliRun object found on file\n");
	184	if (!gAlice) gAlice = new AliRun("gAlice","Alice test program");
	185	}
	186	TTree *fAli=gAlice->TreeK();
f87cfe57	187	if (fAli) pFile =fAli->GetCurrentFile();
f87cfe57	188	pFile->cd();
886b6f73	189	printf("Generate - I'm out \n");
	190	return;
	191	}
09d89034	192
	193	Int_t ifip = Int_t(fIp);
	194
f87cfe57	195
	196	if (fSourceId != -1 && fIgas !=fSourceId) {
	197	irwn++;
	198	continue;
	199	}
	200
09d89034	201	if (ifip > 28 \|\| ifip < 0) {
886b6f73	202	irwn++;
	203	continue;
	204	}
	205
09d89034	206	if ((ifip != fIkine && fIkine != kAll && fIkine != kCharged
09d89034	207	&& fIkine != 10) \|\| fAge > fAgeMax){
886b6f73	208	irwn++;
886b6f73	209	continue;
09d89034	210	} else if (fIkine == kCharged) {
09d89034	211	if (ifip == 7 \|\| ifip == 8 \|\| fAge > fAgeMax) {
886b6f73	212	irwn++;
	213	continue;
	214	}
09d89034	215	} else if (fIkine == kNoNeutron) {
09d89034	216	if (ifip == 8 \|\| fAge > fAgeMax) {
886b6f73	217	irwn++;
	218	continue;
	219	}
	220	}
fe4da5cc	221
fe4da5cc	222
886b6f73	223	irwn++;
02769dba	224	//
09d89034	225	// PDG code from FLUKA particle type (ifip)
09d89034	226	part=kIfluge[int(ifip)-1];
02769dba	227	//
02769dba	228	// Calculate momentum from kinetic energy and mass of the particle
d3ee5d3d	229	amass = (TDatabasePDG::Instance())->GetParticle(part)->Mass();
d3ee5d3d	230
f87cfe57	231	prwn=fEkinsqrt(1. + 2.amass/fEkin);
02769dba	232
02769dba	233
f87cfe57	234	origin[0]=fYi;
	235	origin[1]=fXi;
	236	origin[2]=fZi;
886b6f73	237
f87cfe57	238	p[0]=fPy*prwn;
	239	p[1]=fPx*prwn;
	240	p[2]=fPz*prwn;
fe4da5cc	241
886b6f73	242	//handle particle weight correctly
f87cfe57	243	wgt = (part == 13) ? fWgt*fAddWeight : fWgt;
886b6f73	244	iwgt=Int_t(wgt);
886b6f73	245	fwgt=wgt-Float_t(iwgt);
65fb704d	246	Rndm(random,2);
886b6f73	247	if (random[0] < fwgt) iwgt++;
	248	if (part==1 && iwgt>100) iwgt=100;
	249	Int_t nstack=0;
	250	for (j=0; j<iwgt; j++) {
642f15cf	251	PushTrack(fTrackIt,-1,part,p,origin,polar,fAge,kPPrimary,nt);
65fb704d	252	Rndm(random,2);
886b6f73	253	phi=2random[1]TMath::Pi();
	254	Float_t pn1=p[0]TMath::Sin(phi) - p[1]TMath::Cos(phi);
	255	Float_t pn2=p[0]TMath::Cos(phi) + p[1]TMath::Sin(phi);
	256	p[0]=pn1;
	257	p[1]=pn2;
	258	Float_t on1=origin[0]TMath::Sin(phi)-origin[1]TMath::Cos(phi);
	259	Float_t on2=origin[0]TMath::Cos(phi)+origin[1]TMath::Sin(phi);
	260	origin[0]=on1;
	261	origin[1]=on2;
	262	nstack++;
	263	}
	264	if (nstack == 0) continue;
fe4da5cc	265	}
886b6f73	266
f87cfe57	267	TFile *pFile=0;
fe4da5cc	268	// Get AliRun object or create it
fe4da5cc	269	if (!gAlice) {
f87cfe57	270	gAlice = (AliRun*)pFile->Get("gAlice");
fe4da5cc	271	if (gAlice) printf("AliRun object found on file\n");
	272	if (!gAlice) gAlice = new AliRun("gAlice","Alice test program");
	273	}
	274	TTree *fAli=gAlice->TreeK();
f87cfe57	275	if (fAli) pFile =fAli->GetCurrentFile();
f87cfe57	276	pFile->cd();
fe4da5cc	277	}
	278
	279
f87cfe57	280	AliGenFLUKAsource& AliGenFLUKAsource::operator=(const AliGenFLUKAsource& rhs)
	281	{
	282	// Assignment operator
198bb1c7	283	rhs.Copy(*this);
198bb1c7	284	return (*this);
f87cfe57	285	}
fe4da5cc	286
fe4da5cc	287
198bb1c7	288	void AliGenFLUKAsource::Copy(AliGenFLUKAsource &) const
	289	{
	290	Fatal("Copy","Not implemented!\n");
	291	}
	292
fe4da5cc	293
	294
	295
	296