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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) | |
64eb707f | 41 | :TNamed(name,title), |
42 | fAccelerator(lhc), | |
43 | fBeam1(0), | |
44 | fBeam2(0), | |
45 | fLuminosity(0.), | |
46 | fLuminosity0(0.), | |
47 | fAverageLumi(0.), | |
48 | fBetaStar(0.), | |
49 | fBetaStar0(0.), | |
50 | fCrossingAngle(0.), | |
51 | fFrequency(0.), | |
52 | fLumiArray(0), | |
53 | fAverageLumiArray(0), | |
54 | fBetaStarArray(0) | |
11141716 | 55 | { |
56 | // Constructor | |
11141716 | 57 | } |
58 | ||
64eb707f | 59 | AliLhcIRegion::AliLhcIRegion(const AliLhcIRegion& region): |
60 | TNamed(region), AliLhcMonitor(region), | |
61 | fAccelerator(0), | |
62 | fBeam1(0), | |
63 | fBeam2(0), | |
64 | fLuminosity(0.), | |
65 | fLuminosity0(0.), | |
66 | fAverageLumi(0.), | |
67 | fBetaStar(0.), | |
68 | fBetaStar0(0.), | |
69 | fCrossingAngle(0.), | |
70 | fFrequency(0.), | |
71 | fLumiArray(0), | |
72 | fAverageLumiArray(0), | |
73 | fBetaStarArray(0) | |
11141716 | 74 | { |
75 | // copy constructor | |
76 | } | |
77 | ||
78 | AliLhcIRegion::~AliLhcIRegion() | |
79 | { | |
80 | // Destructor | |
81 | ||
82 | if (fLumiArray) delete fLumiArray; | |
83 | if (fAverageLumiArray) delete fAverageLumiArray; | |
84 | if (fBetaStarArray) delete fBetaStarArray; | |
85 | } | |
86 | ||
87 | ||
e76f229f | 88 | AliLhcIRegion& AliLhcIRegion::operator=(const AliLhcIRegion & /*rhs*/) |
11141716 | 89 | { |
90 | // Assignment operator | |
91 | return *this; | |
92 | } | |
93 | ||
94 | void AliLhcIRegion::Init() | |
95 | { | |
96 | // Initialization | |
97 | printf("\n Initializing Interaction Region %s", GetName()); | |
98 | printf("\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^"); | |
99 | // Initial Luminosity | |
100 | fBeam1 = fAccelerator->Beam(0); | |
101 | fBeam2 = fAccelerator->Beam(1); | |
102 | fFrequency = 3.e10/(2.*TMath::Pi()*fAccelerator->Radius()); | |
103 | ||
104 | Luminosity(); | |
105 | ||
106 | fLuminosity0 = fLuminosity; | |
107 | fAverageLumi=0.; | |
108 | fBetaStar0 = fBetaStar; | |
109 | printf("\n IR Beta* :%10.3e cm ", fBetaStar); | |
110 | printf("\n IR Initial Luminosity :%10.3e cm^-2s^-1 ", fLuminosity); | |
111 | } | |
112 | ||
113 | Float_t AliLhcIRegion::Luminosity() | |
114 | { | |
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)); | |
119 | return fLuminosity; | |
120 | } | |
121 | ||
122 | void AliLhcIRegion::Update() | |
123 | { | |
124 | Luminosity(); | |
125 | } | |
126 | ||
127 | void AliLhcIRegion::SetMonitor(Int_t n) | |
128 | { | |
129 | // Initialize monitors | |
130 | ||
131 | if (fLumiArray) delete fLumiArray; | |
132 | if (fAverageLumiArray) delete fAverageLumiArray; | |
133 | if (fBetaStarArray) delete fBetaStarArray; | |
134 | ||
135 | fLumiArray = new Float_t[n]; | |
136 | fAverageLumiArray = new Float_t[n]; | |
137 | fBetaStarArray = new Float_t[n]; | |
138 | ||
139 | fAverageLumiArray[0] = 0.; | |
140 | fNmax = n; | |
141 | } | |
142 | ||
143 | void AliLhcIRegion::Record() | |
144 | { | |
145 | // Record some time dependent quantities | |
146 | // | |
147 | Int_t n = fAccelerator->Nt(); | |
148 | // Luminosity | |
149 | ||
150 | fLumiArray[n] = fLuminosity; | |
151 | ||
152 | // Average Luminosity respecting set-up and filling time | |
153 | if (fAccelerator->Time() > fAccelerator->SetUpTime()) | |
154 | fAverageLumi+=fLuminosity*fAccelerator->TimeStep(); | |
155 | ||
156 | fAverageLumiArray[n] = fAverageLumi/ | |
157 | (Float_t(n+1)*fAccelerator->TimeStep()+fAccelerator->FillingTime())/ | |
158 | fLuminosity0; | |
159 | ||
160 | // Beta* | |
161 | fBetaStarArray[n] = fBetaStar; | |
162 | } | |
163 | ||
164 | ||
165 | void AliLhcIRegion::DrawPlots() | |
166 | { | |
167 | // | |
168 | // Draw the monitor plots | |
169 | // | |
170 | Float_t* t = fAccelerator->TimeA(); | |
171 | // | |
172 | char name1[20], name2[20], hname[20]; | |
173 | sprintf(name1,"c%s",GetName()); | |
174 | sprintf(name2,"b%s",GetName()); | |
175 | char title[30]; | |
176 | sprintf(title,"Luminosity Lifetime for %s",GetName()); | |
177 | ||
178 | // | |
179 | sprintf(hname,"%s%d",name1,0); | |
180 | TH1 *g1 = new TH1F(hname,"Luminosity",fNmax,0,t[fNmax]); | |
181 | g1->SetMinimum(0); | |
182 | g1->SetMaximum(fLumiArray[0]*1.1); | |
183 | g1->SetStats(0); | |
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]); | |
188 | g2->SetMinimum(0); | |
189 | g2->SetMaximum(1.1); | |
190 | g2->SetStats(0); | |
191 | g2->GetXaxis()->SetTitle("t (h)"); | |
192 | g2->GetYaxis()->SetTitle("L(t)/L0"); | |
193 | sprintf(hname,"%s%d",name1,3); | |
194 | ||
195 | TH1 *g3 = new TH1F(hname,"Average Luminosity",fNmax,0,t[fNmax]); | |
196 | g3->SetMinimum(0); | |
197 | g3->SetMaximum(1.1); | |
198 | g3->SetStats(0); | |
199 | ||
200 | g3->GetXaxis()->SetTitle("t (h)"); | |
201 | g3->GetYaxis()->SetTitle("L(t)/L0"); | |
202 | sprintf(hname,"%s%d",name1,3); | |
203 | ||
204 | TH1 *g4 = new TH1F(hname,"Beta*",fNmax,0,t[fNmax]); | |
205 | g4->SetMinimum(0); | |
206 | g4->SetMaximum(fBetaStarArray[0]*1.1); | |
207 | g4->SetStats(0); | |
208 | g4->GetXaxis()->SetTitle("t (h)"); | |
209 | g4->GetYaxis()->SetTitle("beta* (cm)"); | |
210 | ||
211 | TGraph* grLumi = new TGraph(fNmax, t, fLumiArray); | |
212 | grLumi->SetHistogram(g1); | |
213 | ||
214 | for (Int_t i=0; i<fNmax; i++) { | |
215 | fLumiArray[i]=fLumiArray[i]/fLuminosity0; | |
216 | } | |
217 | TGraph* grLumiN = new TGraph(fNmax, t, fLumiArray); | |
218 | grLumiN->SetHistogram(g2); | |
219 | ||
220 | TGraph* grLumiA = new TGraph(fNmax, t, fAverageLumiArray); | |
221 | grLumiA->SetHistogram(g3); | |
222 | grLumiA->SetLineStyle(2); | |
223 | ||
224 | TGraph* grLumiB = new TGraph(fNmax, t, fBetaStarArray); | |
225 | grLumiB->SetHistogram(g4); | |
226 | ||
227 | TMultiGraph* mg = new TMultiGraph(); | |
228 | mg->Add(grLumiN); | |
229 | mg->Add(grLumiA); | |
230 | ||
231 | ||
232 | ||
233 | TCanvas *c1 = new TCanvas(name1,title, 200, 10, 700, 500); | |
234 | ||
235 | c1->SetGrid(); | |
236 | mg->Draw("AC"); | |
237 | mg->GetXaxis()->SetTitle("t (h)"); | |
238 | mg->GetYaxis()->SetTitle("L(t)/L0 and <L>/L0"); | |
239 | mg->Draw("AC"); | |
240 | ||
241 | TCanvas *c2 = new TCanvas(name2,title, 200, 10, 700, 500); | |
e76f229f | 242 | c2->SetGrid(); |
11141716 | 243 | grLumiB->Draw("AC"); |
244 | ||
245 | } | |
246 | ||
247 | ||
248 | ||
249 |