1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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8 * documentation strictly for non-commercial purposes is hereby granted *
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11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
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14 **************************************************************************/
19 // Realisation of AliLhcMonitor simulating an LHC interaction region.
20 // The interaction region is described by the two LHC beams,
21 // by the beta* and the crossing angle.
22 // As a monitor it records the luminosity, average luminosity and beta*
24 // Author: Andreas Morsch
25 // andreas.morsch@cern.ch
27 #include "AliLhcIRegion.h"
28 #include "AliLhcBeam.h"
35 #include <TMultiGraph.h>
38 ClassImp(AliLhcIRegion)
40 AliLhcIRegion::AliLhcIRegion(AliLHC* lhc, const char* name, const char* title)
59 AliLhcIRegion::AliLhcIRegion(const AliLhcIRegion& region):
60 TNamed(region), AliLhcMonitor(region),
78 AliLhcIRegion::~AliLhcIRegion()
82 if (fLumiArray) delete fLumiArray;
83 if (fAverageLumiArray) delete fAverageLumiArray;
84 if (fBetaStarArray) delete fBetaStarArray;
88 AliLhcIRegion& AliLhcIRegion::operator=(const AliLhcIRegion & /*rhs*/)
90 // Assignment operator
94 void AliLhcIRegion::Init()
97 printf("\n Initializing Interaction Region %s", GetName());
98 printf("\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^");
100 fBeam1 = fAccelerator->Beam(0);
101 fBeam2 = fAccelerator->Beam(1);
102 fFrequency = 3.e10/(2.*TMath::Pi()*fAccelerator->Radius());
106 fLuminosity0 = fLuminosity;
108 fBetaStar0 = fBetaStar;
109 printf("\n IR Beta* :%10.3e cm ", fBetaStar);
110 printf("\n IR Initial Luminosity :%10.3e cm^-2s^-1 ", fLuminosity);
113 Float_t AliLhcIRegion::Luminosity()
115 Float_t sigma1 = TMath::Sqrt(fBeam1->Emittance()*fBetaStar);
116 Float_t sigma2 = TMath::Sqrt(fBeam2->Emittance()*fBetaStar);
117 fLuminosity = fFrequency *
118 fBeam1->N()*fBeam2->N()/(2.*TMath::Pi()*(sigma1*sigma1+sigma2*sigma2));
122 void AliLhcIRegion::Update()
127 void AliLhcIRegion::SetMonitor(Int_t n)
129 // Initialize monitors
131 if (fLumiArray) delete fLumiArray;
132 if (fAverageLumiArray) delete fAverageLumiArray;
133 if (fBetaStarArray) delete fBetaStarArray;
135 fLumiArray = new Float_t[n];
136 fAverageLumiArray = new Float_t[n];
137 fBetaStarArray = new Float_t[n];
139 fAverageLumiArray[0] = 0.;
143 void AliLhcIRegion::Record()
145 // Record some time dependent quantities
147 Int_t n = fAccelerator->Nt();
150 fLumiArray[n] = fLuminosity;
152 // Average Luminosity respecting set-up and filling time
153 if (fAccelerator->Time() > fAccelerator->SetUpTime())
154 fAverageLumi+=fLuminosity*fAccelerator->TimeStep();
156 fAverageLumiArray[n] = fAverageLumi/
157 (Float_t(n+1)*fAccelerator->TimeStep()+fAccelerator->FillingTime())/
161 fBetaStarArray[n] = fBetaStar;
165 void AliLhcIRegion::DrawPlots()
168 // Draw the monitor plots
170 Float_t* t = fAccelerator->TimeA();
172 char name1[20], name2[20], hname[20];
173 sprintf(name1,"c%s",GetName());
174 sprintf(name2,"b%s",GetName());
176 sprintf(title,"Luminosity Lifetime for %s",GetName());
179 sprintf(hname,"%s%d",name1,0);
180 TH1 *g1 = new TH1F(hname,"Luminosity",fNmax,0,t[fNmax]);
182 g1->SetMaximum(fLumiArray[0]*1.1);
184 g1->GetXaxis()->SetTitle("t (h)");
185 g1->GetYaxis()->SetTitle("L(t) (cm**-2 s**-1)");
186 sprintf(hname,"%s%d",name1,1);
187 TH1 *g2 = new TH1F(hname,"Luminosity",fNmax,0,t[fNmax]);
191 g2->GetXaxis()->SetTitle("t (h)");
192 g2->GetYaxis()->SetTitle("L(t)/L0");
193 sprintf(hname,"%s%d",name1,3);
195 TH1 *g3 = new TH1F(hname,"Average Luminosity",fNmax,0,t[fNmax]);
200 g3->GetXaxis()->SetTitle("t (h)");
201 g3->GetYaxis()->SetTitle("L(t)/L0");
202 sprintf(hname,"%s%d",name1,3);
204 TH1 *g4 = new TH1F(hname,"Beta*",fNmax,0,t[fNmax]);
206 g4->SetMaximum(fBetaStarArray[0]*1.1);
208 g4->GetXaxis()->SetTitle("t (h)");
209 g4->GetYaxis()->SetTitle("beta* (cm)");
211 TGraph* grLumi = new TGraph(fNmax, t, fLumiArray);
212 grLumi->SetHistogram(g1);
214 for (Int_t i=0; i<fNmax; i++) {
215 fLumiArray[i]=fLumiArray[i]/fLuminosity0;
217 TGraph* grLumiN = new TGraph(fNmax, t, fLumiArray);
218 grLumiN->SetHistogram(g2);
220 TGraph* grLumiA = new TGraph(fNmax, t, fAverageLumiArray);
221 grLumiA->SetHistogram(g3);
222 grLumiA->SetLineStyle(2);
224 TGraph* grLumiB = new TGraph(fNmax, t, fBetaStarArray);
225 grLumiB->SetHistogram(g4);
227 TMultiGraph* mg = new TMultiGraph();
233 TCanvas *c1 = new TCanvas(name1,title, 200, 10, 700, 500);
237 mg->GetXaxis()->SetTitle("t (h)");
238 mg->GetYaxis()->SetTitle("L(t)/L0 and <L>/L0");
241 TCanvas *c2 = new TCanvas(name2,title, 200, 10, 700, 500);