[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 "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)
{
// copy constructor
}


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