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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 | ||
16 | /* $Id$ */ | |
17 | // | |
18 | // Class that holds all parameters about an LHC beam. | |
19 | // The parameters can change with time. | |
20 | // A monitor can be set that stores the time distribution of | |
21 | // emittance and number of particles per bunch. | |
22 | // Author: Andreas Morsch | |
23 | // andreas.morsch@cern.ch | |
24 | // | |
25 | ||
26 | #include <TCanvas.h> | |
27 | #include <TGraph.h> | |
28 | #include <TH1F.h> | |
29 | #include <TMath.h> | |
30 | #include <TMultiGraph.h> | |
31 | ||
32 | #include "AliLhcBeam.h" | |
33 | #include "AliLHC.h" | |
34 | ||
35 | ClassImp(AliLhcBeam) | |
36 | ||
37 | AliLhcBeam::AliLhcBeam(AliLHC* lhc): | |
38 | fAccelerator(lhc), | |
39 | fN(0), | |
40 | fN0(0), | |
41 | fNEmittance(0.), | |
42 | fEmittance(0.), | |
43 | fEmittance0(0.), | |
44 | fEmittanceL(0.), | |
45 | fEmittanceL0(0.), | |
46 | fEnergySpread(0.), | |
47 | fA(0), | |
48 | fZ(0), | |
49 | fEnergy(0.), | |
50 | fGamma(0.), | |
51 | fTimeArray(0), | |
52 | fEmittanceArray(0), | |
53 | fEmittanceLArray(0) | |
54 | { | |
55 | // Constructor | |
56 | } | |
57 | ||
58 | AliLhcBeam::AliLhcBeam(const AliLhcBeam& beam): | |
59 | TNamed(beam), AliLhcMonitor(beam), | |
60 | fAccelerator(0), | |
61 | fN(0), | |
62 | fN0(0), | |
63 | fNEmittance(0.), | |
64 | fEmittance(0.), | |
65 | fEmittance0(0.), | |
66 | fEmittanceL(0.), | |
67 | fEmittanceL0(0.), | |
68 | fEnergySpread(0.), | |
69 | fA(0), | |
70 | fZ(0), | |
71 | fEnergy(0.), | |
72 | fGamma(0.), | |
73 | fTimeArray(0), | |
74 | fEmittanceArray(0), | |
75 | fEmittanceLArray(0) | |
76 | { | |
77 | // copy constructor | |
78 | } | |
79 | ||
80 | AliLhcBeam::~AliLhcBeam() | |
81 | { | |
82 | // Destructor | |
83 | ||
84 | } | |
85 | ||
86 | void AliLhcBeam::Init() | |
87 | { | |
88 | // Initialization | |
89 | printf("\n Initializing Beam"); | |
90 | printf("\n ^^^^^^^^^^^^^^^^^"); | |
91 | // Scale energy with regidity | |
92 | fEnergy *= fZ/fA; | |
93 | fGamma = fEnergy/0.938272; | |
94 | fEmittance = fNEmittance/fGamma; | |
95 | fEmittance0 = fEmittance; | |
96 | fEmittanceL *= fZ; | |
97 | fEmittanceL0 = fEmittanceL; | |
98 | fN0=fN; | |
99 | ||
100 | printf("\n Beam Energy :%10.3e GeV", fEnergy); | |
101 | printf("\n Beam Normalized Emittance :%10.3e cm ", fNEmittance); | |
102 | printf("\n Beam Particles per Bunch :%10.3e ", fN); | |
103 | } | |
104 | ||
105 | void AliLhcBeam::RemoveParticles(Float_t loss) | |
106 | { | |
107 | fN-=loss; | |
108 | } | |
109 | ||
110 | void AliLhcBeam::IncreaseEmittance(Float_t de, Float_t del) | |
111 | { | |
112 | // | |
113 | // Increase the emittance | |
114 | fEmittance *= (1.+de); | |
115 | fEmittanceL *= (1.+del); | |
116 | fEnergySpread *= (1.+del); | |
117 | } | |
118 | ||
119 | AliLhcBeam& AliLhcBeam::operator=(const AliLhcBeam & /*rhs*/) | |
120 | { | |
121 | // Assignment operator | |
122 | return *this; | |
123 | } | |
124 | void AliLhcBeam::SetMonitor(Int_t n) | |
125 | { | |
126 | // | |
127 | // Initialize a monitor with n time bins | |
128 | fNmax = n; | |
129 | if (fEmittanceArray) delete fEmittanceArray; | |
130 | if (fEmittanceLArray) delete fEmittanceLArray; | |
131 | ||
132 | ||
133 | fEmittanceArray = new Float_t[n]; | |
134 | fEmittanceLArray = new Float_t[n]; | |
135 | } | |
136 | ||
137 | void AliLhcBeam::Record() | |
138 | { | |
139 | fEmittanceArray [fAccelerator->Nt()] = fEmittance/fEmittance0; | |
140 | fEmittanceLArray[fAccelerator->Nt()] = fEmittanceL/fEmittanceL0; | |
141 | } | |
142 | ||
143 | ||
144 | void AliLhcBeam::DrawPlots() | |
145 | { | |
146 | // Draw monitor plots | |
147 | Float_t* t = fAccelerator->TimeA(); | |
148 | ||
149 | TH1 *e1 = new TH1F("e1","Hor. Emittance",fNmax,0,t[fNmax]); | |
150 | e1->SetMinimum(1); | |
151 | e1->SetMaximum(fEmittanceArray[fNmax]*1.1); | |
152 | e1->SetStats(0); | |
153 | e1->GetXaxis()->SetTitle("t (h)"); | |
154 | e1->GetYaxis()->SetTitle("rel. Emittance (t)"); | |
155 | ||
156 | TH1 *e2 = new TH1F("e2","Long. Emittance",fNmax,0,t[fNmax]); | |
157 | e2->SetMinimum(1); | |
158 | e2->SetMaximum(fEmittanceLArray[fNmax]*1.1); | |
159 | e2->SetStats(0); | |
160 | e2->GetXaxis()->SetTitle("t (h)"); | |
161 | e2->GetYaxis()->SetTitle("rel. Emittance (t)"); | |
162 | ||
163 | ||
164 | TGraph* grE = new TGraph(fNmax, t, fEmittanceArray); | |
165 | grE->SetHistogram(e1); | |
166 | TGraph* grEl = new TGraph(fNmax, t, fEmittanceLArray); | |
167 | grEl->SetHistogram(e2); | |
168 | grEl->SetLineStyle(2); | |
169 | ||
170 | TMultiGraph* mg = new TMultiGraph(); | |
171 | mg->Add(grE); | |
172 | mg->Add(grEl); | |
173 | ||
174 | TCanvas *c2 = new TCanvas("c2","Emittance Increase", 200, 10, 700, 500); | |
175 | c2->SetGrid(); | |
176 | mg->Draw("AC"); | |
177 | mg->GetXaxis()->SetTitle("t (h)"); | |
178 | mg->GetYaxis()->SetTitle("rel. Emittance(t)"); | |
179 | mg->Draw("AC"); | |
180 | } | |
181 | ||
182 | ||
183 | ||
184 |