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11141716 | 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 | ||
803d1ab0 | 16 | /* $Id$ */ |
11141716 | 17 | |
21aa51f2 | 18 | // |
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* | |
23 | // time evolution. | |
24 | // Author: Andreas Morsch | |
25 | // andreas.morsch@cern.ch | |
26 | // | |
11141716 | 27 | #include "AliLhcIRegion.h" |
28 | #include "AliLhcBeam.h" | |
29 | #include "AliLHC.h" | |
30 | ||
31 | #include <TMath.h> | |
32 | #include <TCanvas.h> | |
33 | #include <TPad.h> | |
34 | #include <TGraph.h> | |
35 | #include <TMultiGraph.h> | |
36 | #include <TH1.h> | |
37 | ||
38 | ClassImp(AliLhcIRegion) | |
39 | ||
40 | AliLhcIRegion::AliLhcIRegion(AliLHC* lhc, const char* name, const char* title) | |
41 | :TNamed(name,title) | |
42 | { | |
43 | // Constructor | |
44 | fAccelerator=lhc; | |
45 | fLumiArray = 0; | |
46 | fAverageLumiArray = 0; | |
47 | fBetaStarArray = 0; | |
48 | } | |
49 | ||
50 | AliLhcIRegion::AliLhcIRegion(const AliLhcIRegion& region) | |
e76f229f | 51 | : TNamed(region), AliLhcMonitor(region) |
11141716 | 52 | { |
53 | // copy constructor | |
54 | } | |
55 | ||
56 | AliLhcIRegion::~AliLhcIRegion() | |
57 | { | |
58 | // Destructor | |
59 | ||
60 | if (fLumiArray) delete fLumiArray; | |
61 | if (fAverageLumiArray) delete fAverageLumiArray; | |
62 | if (fBetaStarArray) delete fBetaStarArray; | |
63 | } | |
64 | ||
65 | ||
e76f229f | 66 | AliLhcIRegion& AliLhcIRegion::operator=(const AliLhcIRegion & /*rhs*/) |
11141716 | 67 | { |
68 | // Assignment operator | |
69 | return *this; | |
70 | } | |
71 | ||
72 | void AliLhcIRegion::Init() | |
73 | { | |
74 | // Initialization | |
75 | printf("\n Initializing Interaction Region %s", GetName()); | |
76 | printf("\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^"); | |
77 | // Initial Luminosity | |
78 | fBeam1 = fAccelerator->Beam(0); | |
79 | fBeam2 = fAccelerator->Beam(1); | |
80 | fFrequency = 3.e10/(2.*TMath::Pi()*fAccelerator->Radius()); | |
81 | ||
82 | Luminosity(); | |
83 | ||
84 | fLuminosity0 = fLuminosity; | |
85 | fAverageLumi=0.; | |
86 | fBetaStar0 = fBetaStar; | |
87 | printf("\n IR Beta* :%10.3e cm ", fBetaStar); | |
88 | printf("\n IR Initial Luminosity :%10.3e cm^-2s^-1 ", fLuminosity); | |
89 | } | |
90 | ||
91 | Float_t AliLhcIRegion::Luminosity() | |
92 | { | |
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)); | |
97 | return fLuminosity; | |
98 | } | |
99 | ||
100 | void AliLhcIRegion::Update() | |
101 | { | |
102 | Luminosity(); | |
103 | } | |
104 | ||
105 | void AliLhcIRegion::SetMonitor(Int_t n) | |
106 | { | |
107 | // Initialize monitors | |
108 | ||
109 | if (fLumiArray) delete fLumiArray; | |
110 | if (fAverageLumiArray) delete fAverageLumiArray; | |
111 | if (fBetaStarArray) delete fBetaStarArray; | |
112 | ||
113 | fLumiArray = new Float_t[n]; | |
114 | fAverageLumiArray = new Float_t[n]; | |
115 | fBetaStarArray = new Float_t[n]; | |
116 | ||
117 | fAverageLumiArray[0] = 0.; | |
118 | fNmax = n; | |
119 | } | |
120 | ||
121 | void AliLhcIRegion::Record() | |
122 | { | |
123 | // Record some time dependent quantities | |
124 | // | |
125 | Int_t n = fAccelerator->Nt(); | |
126 | // Luminosity | |
127 | ||
128 | fLumiArray[n] = fLuminosity; | |
129 | ||
130 | // Average Luminosity respecting set-up and filling time | |
131 | if (fAccelerator->Time() > fAccelerator->SetUpTime()) | |
132 | fAverageLumi+=fLuminosity*fAccelerator->TimeStep(); | |
133 | ||
134 | fAverageLumiArray[n] = fAverageLumi/ | |
135 | (Float_t(n+1)*fAccelerator->TimeStep()+fAccelerator->FillingTime())/ | |
136 | fLuminosity0; | |
137 | ||
138 | // Beta* | |
139 | fBetaStarArray[n] = fBetaStar; | |
140 | } | |
141 | ||
142 | ||
143 | void AliLhcIRegion::DrawPlots() | |
144 | { | |
145 | // | |
146 | // Draw the monitor plots | |
147 | // | |
148 | Float_t* t = fAccelerator->TimeA(); | |
149 | // | |
150 | char name1[20], name2[20], hname[20]; | |
151 | sprintf(name1,"c%s",GetName()); | |
152 | sprintf(name2,"b%s",GetName()); | |
153 | char title[30]; | |
154 | sprintf(title,"Luminosity Lifetime for %s",GetName()); | |
155 | ||
156 | // | |
157 | sprintf(hname,"%s%d",name1,0); | |
158 | TH1 *g1 = new TH1F(hname,"Luminosity",fNmax,0,t[fNmax]); | |
159 | g1->SetMinimum(0); | |
160 | g1->SetMaximum(fLumiArray[0]*1.1); | |
161 | g1->SetStats(0); | |
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]); | |
166 | g2->SetMinimum(0); | |
167 | g2->SetMaximum(1.1); | |
168 | g2->SetStats(0); | |
169 | g2->GetXaxis()->SetTitle("t (h)"); | |
170 | g2->GetYaxis()->SetTitle("L(t)/L0"); | |
171 | sprintf(hname,"%s%d",name1,3); | |
172 | ||
173 | TH1 *g3 = new TH1F(hname,"Average Luminosity",fNmax,0,t[fNmax]); | |
174 | g3->SetMinimum(0); | |
175 | g3->SetMaximum(1.1); | |
176 | g3->SetStats(0); | |
177 | ||
178 | g3->GetXaxis()->SetTitle("t (h)"); | |
179 | g3->GetYaxis()->SetTitle("L(t)/L0"); | |
180 | sprintf(hname,"%s%d",name1,3); | |
181 | ||
182 | TH1 *g4 = new TH1F(hname,"Beta*",fNmax,0,t[fNmax]); | |
183 | g4->SetMinimum(0); | |
184 | g4->SetMaximum(fBetaStarArray[0]*1.1); | |
185 | g4->SetStats(0); | |
186 | g4->GetXaxis()->SetTitle("t (h)"); | |
187 | g4->GetYaxis()->SetTitle("beta* (cm)"); | |
188 | ||
189 | TGraph* grLumi = new TGraph(fNmax, t, fLumiArray); | |
190 | grLumi->SetHistogram(g1); | |
191 | ||
192 | for (Int_t i=0; i<fNmax; i++) { | |
193 | fLumiArray[i]=fLumiArray[i]/fLuminosity0; | |
194 | } | |
195 | TGraph* grLumiN = new TGraph(fNmax, t, fLumiArray); | |
196 | grLumiN->SetHistogram(g2); | |
197 | ||
198 | TGraph* grLumiA = new TGraph(fNmax, t, fAverageLumiArray); | |
199 | grLumiA->SetHistogram(g3); | |
200 | grLumiA->SetLineStyle(2); | |
201 | ||
202 | TGraph* grLumiB = new TGraph(fNmax, t, fBetaStarArray); | |
203 | grLumiB->SetHistogram(g4); | |
204 | ||
205 | TMultiGraph* mg = new TMultiGraph(); | |
206 | mg->Add(grLumiN); | |
207 | mg->Add(grLumiA); | |
208 | ||
209 | ||
210 | ||
211 | TCanvas *c1 = new TCanvas(name1,title, 200, 10, 700, 500); | |
212 | ||
213 | c1->SetGrid(); | |
214 | mg->Draw("AC"); | |
215 | mg->GetXaxis()->SetTitle("t (h)"); | |
216 | mg->GetYaxis()->SetTitle("L(t)/L0 and <L>/L0"); | |
217 | mg->Draw("AC"); | |
218 | ||
219 | TCanvas *c2 = new TCanvas(name2,title, 200, 10, 700, 500); | |
e76f229f | 220 | c2->SetGrid(); |
11141716 | 221 | grLumiB->Draw("AC"); |
222 | ||
223 | } | |
224 | ||
225 | ||
226 | ||
227 |