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. *
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 **************************************************************************/
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)
46 fAverageLumiArray = 0;
50 AliLhcIRegion::AliLhcIRegion(const AliLhcIRegion& region)
51 : TNamed(region), AliLhcMonitor(region)
56 AliLhcIRegion::~AliLhcIRegion()
60 if (fLumiArray) delete fLumiArray;
61 if (fAverageLumiArray) delete fAverageLumiArray;
62 if (fBetaStarArray) delete fBetaStarArray;
66 AliLhcIRegion& AliLhcIRegion::operator=(const AliLhcIRegion & /*rhs*/)
68 // Assignment operator
72 void AliLhcIRegion::Init()
75 printf("\n Initializing Interaction Region %s", GetName());
76 printf("\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^");
78 fBeam1 = fAccelerator->Beam(0);
79 fBeam2 = fAccelerator->Beam(1);
80 fFrequency = 3.e10/(2.*TMath::Pi()*fAccelerator->Radius());
84 fLuminosity0 = fLuminosity;
86 fBetaStar0 = fBetaStar;
87 printf("\n IR Beta* :%10.3e cm ", fBetaStar);
88 printf("\n IR Initial Luminosity :%10.3e cm^-2s^-1 ", fLuminosity);
91 Float_t AliLhcIRegion::Luminosity()
93 Float_t sigma1 = TMath::Sqrt(fBeam1->Emittance()*fBetaStar);
94 Float_t sigma2 = TMath::Sqrt(fBeam2->Emittance()*fBetaStar);
95 fLuminosity = fFrequency *
96 fBeam1->N()*fBeam2->N()/(2.*TMath::Pi()*(sigma1*sigma1+sigma2*sigma2));
100 void AliLhcIRegion::Update()
105 void AliLhcIRegion::SetMonitor(Int_t n)
107 // Initialize monitors
109 if (fLumiArray) delete fLumiArray;
110 if (fAverageLumiArray) delete fAverageLumiArray;
111 if (fBetaStarArray) delete fBetaStarArray;
113 fLumiArray = new Float_t[n];
114 fAverageLumiArray = new Float_t[n];
115 fBetaStarArray = new Float_t[n];
117 fAverageLumiArray[0] = 0.;
121 void AliLhcIRegion::Record()
123 // Record some time dependent quantities
125 Int_t n = fAccelerator->Nt();
128 fLumiArray[n] = fLuminosity;
130 // Average Luminosity respecting set-up and filling time
131 if (fAccelerator->Time() > fAccelerator->SetUpTime())
132 fAverageLumi+=fLuminosity*fAccelerator->TimeStep();
134 fAverageLumiArray[n] = fAverageLumi/
135 (Float_t(n+1)*fAccelerator->TimeStep()+fAccelerator->FillingTime())/
139 fBetaStarArray[n] = fBetaStar;
143 void AliLhcIRegion::DrawPlots()
146 // Draw the monitor plots
148 Float_t* t = fAccelerator->TimeA();
150 char name1[20], name2[20], hname[20];
151 sprintf(name1,"c%s",GetName());
152 sprintf(name2,"b%s",GetName());
154 sprintf(title,"Luminosity Lifetime for %s",GetName());
157 sprintf(hname,"%s%d",name1,0);
158 TH1 *g1 = new TH1F(hname,"Luminosity",fNmax,0,t[fNmax]);
160 g1->SetMaximum(fLumiArray[0]*1.1);
162 g1->GetXaxis()->SetTitle("t (h)");
163 g1->GetYaxis()->SetTitle("L(t) (cm**-2 s**-1)");
164 sprintf(hname,"%s%d",name1,1);
165 TH1 *g2 = new TH1F(hname,"Luminosity",fNmax,0,t[fNmax]);
169 g2->GetXaxis()->SetTitle("t (h)");
170 g2->GetYaxis()->SetTitle("L(t)/L0");
171 sprintf(hname,"%s%d",name1,3);
173 TH1 *g3 = new TH1F(hname,"Average Luminosity",fNmax,0,t[fNmax]);
178 g3->GetXaxis()->SetTitle("t (h)");
179 g3->GetYaxis()->SetTitle("L(t)/L0");
180 sprintf(hname,"%s%d",name1,3);
182 TH1 *g4 = new TH1F(hname,"Beta*",fNmax,0,t[fNmax]);
184 g4->SetMaximum(fBetaStarArray[0]*1.1);
186 g4->GetXaxis()->SetTitle("t (h)");
187 g4->GetYaxis()->SetTitle("beta* (cm)");
189 TGraph* grLumi = new TGraph(fNmax, t, fLumiArray);
190 grLumi->SetHistogram(g1);
192 for (Int_t i=0; i<fNmax; i++) {
193 fLumiArray[i]=fLumiArray[i]/fLuminosity0;
195 TGraph* grLumiN = new TGraph(fNmax, t, fLumiArray);
196 grLumiN->SetHistogram(g2);
198 TGraph* grLumiA = new TGraph(fNmax, t, fAverageLumiArray);
199 grLumiA->SetHistogram(g3);
200 grLumiA->SetLineStyle(2);
202 TGraph* grLumiB = new TGraph(fNmax, t, fBetaStarArray);
203 grLumiB->SetHistogram(g4);
205 TMultiGraph* mg = new TMultiGraph();
211 TCanvas *c1 = new TCanvas(name1,title, 200, 10, 700, 500);
215 mg->GetXaxis()->SetTitle("t (h)");
216 mg->GetYaxis()->SetTitle("L(t)/L0 and <L>/L0");
219 TCanvas *c2 = new TCanvas(name2,title, 200, 10, 700, 500);