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1 | /************************************************************************** | |
2 | * Copyright(c) 2007, 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 | // The class which simulates the pulse shape from the PHOS FEE shaper, | |
19 | // make sampled amplitudes, digitize them. | |
20 | // Use case: | |
21 | // AliPHOSPulseGenerator *pulse = new AliPHOSPulseGenerator(energy,time); | |
22 | // Int_t *adcHG = new Int_t[pulse->GetRawFormatTimeBins()]; | |
23 | // Int_t *adcLG= new Int_t[pulse->GetRawFormatTimeBins()]; | |
24 | // pulse->AddNoise(1.); | |
25 | // pulse->MakeSamples(); | |
26 | // pulse->GetSamples(adcHG, adcHG) ; | |
27 | // pulse->Print(); | |
28 | // pulse->Draw(); | |
29 | // | |
30 | // Author: Yuri Kharlov, after Yves Schutz and Per Thomas Hille | |
31 | ||
32 | // --- ROOT system --- | |
33 | ||
34 | #include <TCanvas.h> | |
35 | #include <TF1.h> | |
36 | #include <TGraph.h> | |
37 | #include <TH1F.h> | |
38 | #include <TMath.h> | |
39 | #include <TRandom.h> | |
40 | ||
41 | // --- AliRoot header files --- | |
42 | #include "AliLog.h" | |
43 | #include "AliPHOSPulseGenerator.h" | |
44 | ||
45 | // --- Standard library --- | |
46 | #include <cmath> | |
47 | #include <iostream> | |
48 | ||
49 | using std::cout; | |
50 | using std::endl; | |
51 | ||
52 | ClassImp(AliPHOSPulseGenerator) | |
53 | ||
54 | Int_t AliPHOSPulseGenerator::fgOrder = 2 ; // order of the Gamma function | |
55 | Double_t AliPHOSPulseGenerator::fgTimePeak = 2.1E-6 ; // tau=2.1 micro seconds | |
56 | Double_t AliPHOSPulseGenerator::fgTimeTrigger = 100E-9 ; // one tick 100 ns | |
57 | ||
58 | //----------------------------------------------------------------------------- | |
59 | AliPHOSPulseGenerator::AliPHOSPulseGenerator(Double_t a, Double_t t0) | |
60 | : TObject(), fAmplitude(a), fTZero(t0), fHG2LGratio(16.), fDataHG(0), fDataLG(0), fDigitize(kTRUE) | |
61 | { | |
62 | // Contruct a pulsegenrator object and initializes all necessary parameters | |
63 | // @param a digit amplitude in GeV | |
64 | // @param t0 time delay in nanoseconds of signal relative the first sample. | |
65 | // This value should be between 0 and Ts, where Ts is the sample interval | |
66 | ||
67 | fDataHG = new Double_t[fkTimeBins]; | |
68 | fDataLG = new Double_t[fkTimeBins]; | |
69 | Reset(); | |
70 | } | |
71 | ||
72 | //----------------------------------------------------------------------------- | |
73 | AliPHOSPulseGenerator::~AliPHOSPulseGenerator() | |
74 | { | |
75 | // Destructor: delete arrays of samples | |
76 | ||
77 | delete [] fDataHG; | |
78 | fDataHG=0; | |
79 | delete [] fDataLG; | |
80 | fDataLG=0; | |
81 | } | |
82 | ||
83 | //----------------------------------------------------------------------------- | |
84 | void AliPHOSPulseGenerator::Reset() | |
85 | { | |
86 | // Reset all sample amplitudes to 0 | |
87 | ||
88 | for (Int_t i=0; i<fkTimeBins; i++) { | |
89 | fDataHG[i] = 0.; | |
90 | fDataLG[i] = 0.; | |
91 | } | |
92 | } | |
93 | ||
94 | //----------------------------------------------------------------------------- | |
95 | void AliPHOSPulseGenerator::AddBaseline(Double_t baselineLevel) | |
96 | { | |
97 | // Adds a baseline offset to the signal | |
98 | // @param baselineLevel The basline level to add | |
99 | for (Int_t i=0; i<fkTimeBins; i++) { | |
100 | fDataHG[i] += baselineLevel; | |
101 | fDataLG[i] += baselineLevel; | |
102 | } | |
103 | // Digitize floating point amplitudes to integers | |
104 | if (fDigitize) Digitize(); | |
105 | } | |
106 | ||
107 | //----------------------------------------------------------------------------- | |
108 | void AliPHOSPulseGenerator::AddNoise(Double_t sigma) | |
109 | { | |
110 | // Adds Gaussian uncorrelated to the sample array | |
111 | // @param sigma the noise amplitude in entities of ADC levels | |
112 | ||
113 | for (Int_t i=0; i<fkTimeBins; i++) { | |
114 | fDataHG[i] = gRandom->Gaus(0., sigma) ; | |
115 | fDataLG[i] = gRandom->Gaus(0., sigma) ; | |
116 | } | |
117 | } | |
118 | ||
119 | //----------------------------------------------------------------------------- | |
120 | void AliPHOSPulseGenerator::AddNoise(Double_t * /* sigma */, Double_t /* cutoff */) | |
121 | { | |
122 | //Adds correlated Gaussian noise with cutof frequency "cutoff" | |
123 | // @param sigma noise amplitude in entities of ADC levels | |
124 | // @param -30DB cutoff frequency of the noise in entities of sampling frequency | |
125 | ||
126 | AliError("not implemented yet"); | |
127 | } | |
128 | ||
129 | //----------------------------------------------------------------------------- | |
130 | void AliPHOSPulseGenerator::AddPretriggerSamples(Int_t nPresamples) | |
131 | { | |
132 | // Adds pretrigger samples to the sample arrays and replace them | |
133 | // with concatinated and truncated arrays | |
134 | ||
135 | Double_t *tmpDataHG = new Double_t[fkTimeBins]; | |
136 | Double_t *tmpDataLG = new Double_t[fkTimeBins]; | |
137 | Int_t i; | |
138 | for (i=0; i<fkTimeBins; i++) { | |
139 | tmpDataHG[i] = fDataHG[i]; | |
140 | tmpDataLG[i] = fDataLG[i]; | |
141 | } | |
142 | for (i=0; i<fkTimeBins; i++) { | |
143 | if (i<nPresamples) { | |
144 | fDataHG[i] = 0.; | |
145 | fDataLG[i] = 0.; | |
146 | } | |
147 | else { | |
148 | fDataHG[i] = tmpDataHG[i-nPresamples]; | |
149 | fDataLG[i] = tmpDataLG[i-nPresamples]; | |
150 | } | |
151 | } | |
152 | delete [] tmpDataHG; | |
153 | delete [] tmpDataLG; | |
154 | } | |
155 | ||
156 | //----------------------------------------------------------------------------- | |
157 | void AliPHOSPulseGenerator::Digitize() | |
158 | { | |
159 | // Emulates ADC: rounds up to nearest integer value all amplitudes | |
160 | for (Int_t i=0; i<fkTimeBins; i++) { | |
161 | fDataHG[i] = (Int_t)(fDataHG[i]); | |
162 | fDataLG[i] = (Int_t)(fDataLG[i]); | |
163 | } | |
164 | } | |
165 | ||
166 | //----------------------------------------------------------------------------- | |
167 | Double_t AliPHOSPulseGenerator::RawResponseFunction(Double_t *x, Double_t *par) | |
168 | { | |
169 | // Shape of the electronics raw reponse: | |
170 | // It is a semi-gaussian, 2nd order Gamma function of the general form | |
171 | // v(t) = A *(t/tp)**n * exp(-n * t/tp-n) with | |
172 | // tp : peaking time fgTimePeak | |
173 | // n : order of the function | |
174 | ||
175 | Double_t signal ; | |
176 | Double_t xx = x[0] - ( fgTimeTrigger + par[1] ) ; | |
177 | ||
178 | if (xx < 0 || xx > GetRawFormatTimeMax()) | |
179 | signal = 0. ; | |
180 | else { | |
181 | signal = par[0] * TMath::Power(xx/fgTimePeak, fgOrder) * TMath::Exp(-fgOrder*(xx/fgTimePeak-1.)) ; //normalized to par[2] at maximum | |
182 | } | |
183 | return signal ; | |
184 | } | |
185 | ||
186 | //__________________________________________________________________ | |
187 | Bool_t AliPHOSPulseGenerator::MakeSamples() | |
188 | { | |
189 | // for a start time fTZero and an amplitude fAmplitude given by digit, | |
190 | // calculates the raw sampled response AliPHOSPulseGenerator::RawResponseFunction | |
191 | ||
192 | const Int_t kRawSignalOverflow = 0x3FF ; // decimal 1023 | |
193 | Bool_t lowGain = kFALSE ; | |
194 | ||
195 | TF1 signalF("signal", RawResponseFunction, 0, GetRawFormatTimeMax(), 4); | |
196 | ||
197 | for (Int_t iTime = 0; iTime < GetRawFormatTimeBins(); iTime++) { | |
198 | signalF.SetParameter(0, fAmplitude) ; | |
199 | signalF.SetParameter(1, fTZero) ; | |
200 | Double_t time = iTime * GetRawFormatTimeMax() / GetRawFormatTimeBins() ; | |
201 | Double_t signal = signalF.Eval(time) ; | |
202 | fDataHG[iTime] += signal; | |
203 | if ( static_cast<Int_t>(fDataHG[iTime]+0.5) > kRawSignalOverflow ){ // larger than 10 bits | |
204 | fDataHG[iTime] = kRawSignalOverflow ; | |
205 | lowGain = kTRUE ; | |
206 | } | |
207 | ||
208 | Double_t aLGamp = fAmplitude/fHG2LGratio ; | |
209 | signalF.SetParameter(0, aLGamp) ; | |
210 | signal = signalF.Eval(time) ; | |
211 | fDataLG[iTime] += signal; | |
212 | if ( static_cast<Int_t>(fDataLG[iTime]+0.5) > kRawSignalOverflow) // larger than 10 bits | |
213 | fDataLG[iTime] = kRawSignalOverflow ; | |
214 | } | |
215 | // Digitize floating point amplitudes to integers | |
216 | if (fDigitize) Digitize(); | |
217 | return lowGain ; | |
218 | } | |
219 | ||
220 | //__________________________________________________________________ | |
221 | void AliPHOSPulseGenerator::GetSamples(Int_t *adcHG, Int_t *adcLG) const | |
222 | { | |
223 | // Return integer sample arrays adcHG and adcLG | |
224 | for (Int_t iTime = 0; iTime < GetRawFormatTimeBins(); iTime++) { | |
225 | adcHG[iTime] = static_cast<Int_t>(fDataHG[iTime]) ; | |
226 | adcLG[iTime] = static_cast<Int_t>(fDataLG[iTime]) ; | |
227 | } | |
228 | } | |
229 | ||
230 | //__________________________________________________________________ | |
231 | void AliPHOSPulseGenerator::Print(Option_t*) const | |
232 | { | |
233 | // Prints sampled amplitudes to stdout | |
234 | Int_t i; | |
235 | cout << "High gain: "; | |
236 | for (i=0; i<fkTimeBins; i++) | |
237 | cout << (Int_t)fDataHG[i] << " "; | |
238 | cout << endl; | |
239 | ||
240 | cout << "Low gain: "; | |
241 | for (i=0; i<fkTimeBins; i++) | |
242 | cout << (Int_t)fDataLG[i] << " "; | |
243 | cout << endl; | |
244 | } | |
245 | ||
246 | //__________________________________________________________________ | |
247 | void AliPHOSPulseGenerator::Draw(Option_t* opt) | |
248 | { | |
249 | // Draw graphs with high and low gain samples | |
250 | // Option_t* opt="all": draw both HG and LG in one canvas | |
251 | // "HG" : draw HG only | |
252 | // "LG" : draw LG only | |
253 | ||
254 | Double_t *time = new Double_t[fkTimeBins]; | |
255 | for (Int_t iTime = 0; iTime < GetRawFormatTimeBins(); iTime++) { | |
256 | time[iTime] = iTime * GetRawFormatTimeMax() / GetRawFormatTimeBins() ; | |
257 | } | |
258 | Int_t nPoints = fkTimeBins; | |
259 | TGraph *graphHG = new TGraph(nPoints,time,fDataHG); | |
260 | TGraph *graphLG = new TGraph(nPoints,time,fDataLG); | |
261 | graphHG->SetMarkerStyle(20); | |
262 | graphLG->SetMarkerStyle(20); | |
263 | graphHG->SetMarkerSize(0.4); | |
264 | graphLG->SetMarkerSize(0.4); | |
265 | graphHG->SetTitle("High gain samples"); | |
266 | graphLG->SetTitle("Low gain samples"); | |
267 | ||
268 | TCanvas *c1 = new TCanvas("c1","Raw ALTRO samples",10,10,700,500); | |
269 | c1->SetFillColor(0); | |
270 | ||
271 | if (strstr(opt,"all")){ | |
272 | c1->Divide(2,1); | |
273 | c1->cd(1); | |
274 | gPad->SetLeftMargin(0.15); | |
275 | } | |
276 | if (strstr(opt,"LG") == 0){ | |
277 | graphHG->Draw("AP"); | |
278 | graphHG->GetHistogram()->SetTitleOffset(1.0,"Y"); | |
279 | graphHG->GetHistogram()->SetXTitle("time, sec"); | |
280 | graphHG->GetHistogram()->SetYTitle("Amplitude, ADC counts"); | |
281 | } | |
282 | if (strstr(opt,"all")){ | |
283 | c1->cd(2); | |
284 | gPad->SetLeftMargin(0.15); | |
285 | } | |
286 | if (strstr(opt,"HG") == 0){ | |
287 | graphLG->Draw("AP"); | |
288 | graphLG->GetHistogram()->SetTitleOffset(1.0,"Y"); | |
289 | graphLG->GetHistogram()->SetXTitle("time, sec"); | |
290 | graphLG->GetHistogram()->SetYTitle("Amplitude, ADC counts"); | |
291 | } | |
292 | c1->Update(); | |
293 | } | |
294 |