The present commit corresponds to an important change in the way the
[u/mrichter/AliRoot.git] / HMPID / AliHMPIDv2.cxx
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
17 #include "AliHMPIDv2.h"       //class header
18 #include "AliHMPIDParam.h"    //StepManager()
19 #include "AliHMPIDHit.h"      //Hits2SDigs(),StepManager()
20 #include "AliHMPIDDigit.h"    //Digits2Raw(), Raw2SDigits()
21 #include "AliHMPIDRawStream.h"  //Digits2Raw(), Raw2SDigits()
22 #include "AliRawReader.h"     //Raw2SDigits()
23 #include "AliTrackReference.h"
24 #include <TVirtualMC.h>       //StepManager() for gMC
25 #include <TPDGCode.h>         //StepHistory() 
26 #include <AliStack.h>         //StepManager(),Hits2SDigits()78.6
27 #include <AliLoader.h>        //Hits2SDigits()
28 #include <AliRunLoader.h>     //Hits2SDigits()
29 #include <AliMC.h>            //StepManager()      
30 #include <AliRun.h>           //CreateMaterials()    
31 #include <AliMagF.h>          //CreateMaterials()
32 #include "AliGeomManager.h"   //AddAlignableVolumes()
33 #include <AliCDBEntry.h>      //CreateMaterials()
34 #include <AliCDBManager.h>    //CreateMaterials()
35 #include <TF1.h>              //DefineOpticalProperties()
36 #include <TF2.h>              //DefineOpticalProperties()
37 #include <TGeoGlobalMagField.h>
38 #include <TGeoPhysicalNode.h> //AddAlignableVolumes()
39 #include <TLorentzVector.h>   //IsLostByFresnel() 
40
41 ClassImp(AliHMPIDv2)    
42 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
43 void AliHMPIDv2::AddAlignableVolumes()const
44 {
45 // Associates the symbolic volume name with the corresponding volume path. Interface method from AliModule invoked from AliMC
46 // Arguments: none
47 //   Returns: none   
48
49   AliGeomManager::ELayerID idHMPID = AliGeomManager::kHMPID;
50   Int_t modUID, modnum = 0;
51
52   TGeoHMatrix *pGm = new TGeoHMatrix;
53   Double_t trans[3]={0.5*131.24,0.5*126.16,0};                            //translation from LORS to TGeo RS (half size AllX, half size allY,0)
54   pGm->SetTranslation(trans);
55  
56   Double_t ph[7]={10.,10., 30.,30.,30. ,50.,50};
57
58   for(Int_t iCh=AliHMPIDParam::kMinCh;iCh<=AliHMPIDParam::kMaxCh;iCh++) {
59     modUID = AliGeomManager::LayerToVolUID(idHMPID,modnum++);
60     if(!gGeoManager->SetAlignableEntry(Form("/HMPID/Chamber%i",iCh),Form("ALIC_1/Hmp_%i",iCh),modUID))
61             AliError("AliHMPIDv3::Unable to set alignable entry!!");  //aligment without AliCluster3D
62     //Get Tracking To Local matricies for alignment with AliCluster3D
63     TGeoPNEntry *eCh = gGeoManager->GetAlignableEntryByUID(modUID);
64     TGeoHMatrix *globMatrix = eCh->GetGlobalOrig();
65
66     //Double_t phi = 20.0 * ((iCh+1) / 3) + 10.0;
67     Double_t phi = ph[iCh];
68     TGeoHMatrix *t2l  = new TGeoHMatrix();
69     t2l->RotateZ(phi);
70     t2l->MultiplyLeft(&(globMatrix->Inverse()));
71     eCh->SetMatrix(t2l);
72   }//iCh loop
73 }
74 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
75 void AliHMPIDv2::CreateMaterials()
76 {
77 // Definition of available HMPID materials  
78 // Arguments: none
79 //   Returns: none    
80   AliDebug(1,"Start v2 HMPID.");
81     
82     //clm update material definition later on from Antonello
83     
84 //data from PDG booklet 2002     density [gr/cm^3] rad len [cm] abs len [cm]    
85   Float_t   aAir[4]={12,14,16,36}    ,   zAir[4]={6,7,8,18} ,   wAir[4]={0.000124,0.755267,0.231781,0.012827} , dAir=0.00120479; Int_t nAir=4;//mixture 0.9999999
86   Float_t aC6F14[2]={ 12.01 , 18.99} , zC6F14[2]={ 6 , 9}   , wC6F14[2]={6 , 14} , dC6F14=1.68    ; Int_t nC6F14=-2;
87   Float_t  aSiO2[2]={ 28.09 , 15.99} ,  zSiO2[2]={14 , 8}   ,  wSiO2[2]={1 ,  2} ,  dSiO2=2.64    ; Int_t  nSiO2=-2; 
88   Float_t   aCH4[2]={ 12.01 ,  1.01} ,   zCH4[2]={ 6 , 1}   ,   wCH4[2]={1 ,  4} ,   dCH4=7.17e-4 ; Int_t   nCH4=-2; 
89 // not necessary...PCB properties instead! Float_t   aCsI[2]={132.90 ,126.90} ,   zCsI[2]={55 ,53}   ,   wCsI[2]={1 ,  1} ,   dCsI=0.1     ; Int_t   nCsI=-2; 
90   
91   Float_t     aRoha = 12.01 ,   zRoha =  6 ,  dRoha =  0.10    ,   radRoha = 18.80 , absRoha =  86.3/dRoha; //special material- quasi quartz
92   Float_t       aCu = 63.55 ,   zCu   = 29 ,  dCu   =  8.96    ,   radCu   =  1.43 , absCu   = 134.9/dCu  ;
93   Float_t        aW =183.84 ,   zW    = 74 ,  dW    = 19.30    ,   radW    =  0.35 , absW    = 185.0/dW   ;
94   Float_t       aAl = 26.98 ,   zAl   = 13 ,  dAl   =  2.70    ,   radAl   =  8.90 , absAl   = 106.4/dAl  ;
95   Float_t       aAr = 39.94 ,   zAr   = 18 ,  dAr   =  1.396e-3,   radAr   =  14.0 , absAr   = 117.2/dAr  ;   
96
97     Int_t   matId=0;                           //tmp material id number
98     Int_t   unsens =  0, sens=1;               //sensitive or unsensitive medium
99     Int_t   itgfld = ((AliMagF*)TGeoGlobalMagField::Instance()->GetField())->Integ(); //type of field intergration 0 no field -1 user in guswim 1 Runge Kutta 2 helix 3 const field along z
100     Float_t maxfld = ((AliMagF*)TGeoGlobalMagField::Instance()->GetField())->Max();   //max field value
101     Float_t tmaxfd = -10.0;                    //max deflection angle due to magnetic field in one step
102     Float_t deemax = - 0.2;                    //max fractional energy loss in one step   
103     Float_t stemax = - 0.1;                    //max step allowed [cm]
104     Float_t epsil  =   0.001;                  //abs tracking precision [cm]   
105     Float_t stmin  = - 0.001;                  //min step size [cm] in continius process transport, negative value: choose it automatically
106
107     // PCB copmposed mainly by G10 (Si,C,H,O) -> CsI is negligible (<500nm thick)
108     // So what is called CsI has the optical properties of CsI, but the composition of G-10 (for delta elec, etc production...)
109     
110     Float_t aG10[4] = {28.09,12.01,1.01,16.00};
111     Float_t zG10[4] = {14.,  6.,  1.,  8.};
112     Float_t wG10[4] = {0.129060,0.515016,0.061873,0.294050};
113     Float_t dG10    = 1.7;
114     Int_t   nG10    = 4;
115     
116     AliMixture(++matId,"Air"  ,aAir  ,zAir  ,dAir  ,nAir  ,wAir  ); AliMedium(kAir  ,"Air"  ,matId, unsens, itgfld, maxfld, tmaxfd, stemax, deemax, epsil, stmin);
117     AliMixture(++matId,"C6F14",aC6F14,zC6F14,dC6F14,nC6F14,wC6F14); AliMedium(kC6F14,"C6F14",matId, unsens, itgfld, maxfld, tmaxfd, stemax, deemax, epsil, stmin);      
118     AliMixture(++matId,"SiO2" ,aSiO2 ,zSiO2 ,dSiO2 ,nSiO2 ,wSiO2 ); AliMedium(kSiO2 ,"SiO2" ,matId, unsens, itgfld, maxfld, tmaxfd, stemax, deemax, epsil, stmin);    
119     AliMixture(++matId,"CH4"  ,aCH4  ,zCH4  ,dCH4  ,nCH4  ,wCH4  ); AliMedium(kCH4  ,"CH4"  ,matId, unsens, itgfld, maxfld, tmaxfd, stemax, deemax, epsil, stmin);  
120 //    AliMixture(++matId,"CsI"  ,aCsI  ,zCsI  ,dCsI  ,nCsI  ,wCsI  ); AliMedium(kCsI  ,"CsI"  ,matId,   sens, itgfld, maxfld, tmaxfd, stemax, deemax, epsil, stmin);//sensitive
121     AliMixture(++matId,"CsI+PCB",aG10  , zG10, dG10,nG10   ,wG10   ); AliMedium(kCsI  ,"CsI"  ,matId,   sens, itgfld, maxfld, tmaxfd, stemax, deemax, epsil, stmin);//sensitive
122
123     AliMixture(++matId ,"Neo" ,aSiO2 ,zSiO2 ,dSiO2 ,nSiO2 ,wSiO2 ); AliMedium(kNeo  ,"Neo"  ,matId, unsens, itgfld, maxfld, tmaxfd, stemax, deemax, epsil, stmin); //clm neoceram
124     AliMaterial(++matId,"Roha",aRoha,zRoha,dRoha,radRoha,absRoha);  AliMedium(kRoha ,"Roha" ,matId, unsens, itgfld, maxfld, tmaxfd, stemax, deemax, epsil, stmin); //Roha->honeycomb
125
126
127     AliMaterial(++matId,"Cu"  ,aCu  ,zCu  ,dCu  ,radCu  ,absCu  );  AliMedium(kCu  ,"Cu"  , matId, unsens, itgfld, maxfld, tmaxfd, stemax, deemax, epsil, stmin);
128     AliMaterial(++matId,"W"   ,aW   ,zW   ,dW   ,radW   ,absW   );  AliMedium(kW   ,"W"   , matId, unsens, itgfld, maxfld, tmaxfd, stemax, deemax, epsil, stmin);
129     AliMaterial(++matId,"Al"  ,aAl  ,zAl  ,dAl  ,radAl  ,absAl  );  AliMedium(kAl  ,"Al"  , matId, unsens, itgfld, maxfld, tmaxfd, stemax, deemax, epsil, stmin);
130     AliMaterial(++matId,"Ar"  ,aAr  ,zAr  ,dAr  ,radAr  ,absAr  );  AliMedium(kAr  ,"Ar"  , matId, unsens, itgfld, maxfld, tmaxfd, stemax, deemax, epsil, stmin);
131
132     InitProperties();
133         
134 }//void AliHMPID::CreateMaterials()
135 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
136 void AliHMPIDv2::InitProperties()
137 {
138 /*
139 * HMPID
140 * ====
141 *
142 *       GAM   ELEC  NHAD   CHAD  MUON  EBREM MUHAB  EDEL  MUDEL MUPA ANNI BREM COMP DCAY DRAY HADR LOSS MULS PAIR PHOT RAYL
143 * Quarz Window        (>1000 keV delta-electrons)
144 HMPID  3  1.e-4 1.e-4 1.e-4  -1.   1.e-4 -1.   -1.    1.e-3 1.e-3 -1.  -1   -1   -1   -1   1    -1   1    -1   -1   -1   -1 
145 * Freon Radiator      (>  500 keV delta-electrons)
146 HMPID  4  1.e-4 1.e-4 1.e-4  -1.   1.e-4 -1.   -1.    5.e-4 5.e-4 -1.  -1   -1   -1   -1   1    -1   1    -1   -1   -1   -1 
147 * Methane Gap         (>  100 keV delta-electrons)
148 HMPID  5  5.e-5 1.e-5 1.e-4 -1.   1.e-4 -1.   -1.     1.e-4 1.e-4 -1.  -1   -1   -1   -1   1    -1   1    -1   -1   -1   -1 
149 * Sensitive Volume    (>  50 keV delta-electrons)
150 HMPID  9  1.e-5 1.e-5 1.e-4  -1.   1.e-4 -1.   -1.    5.e-5 5.e-5 -1.  -1   -1   -1   -1   1    -1   1    -1   -1   -1   -1 
151 * CSI    (>  50 keV delta-electrons)
152 HMPID  6  1.e-5 1.e-5 1.e-4  -1.   1.e-4 -1.   -1.    5.e-5 5.e-5 -1.  -1   -1   -1   -1   1    -1   1    -1   -1   -1   -1 
153 * PCB backplane   (>  50 keV delta-electrons)
154 HMPID 12  1.e-5 1.e-5 1.e-4  -1.   1.e-4 -1.   -1.    5.e-5 5.e-5 -1.  -1   -1   -1   -1   1    -1   1    -1   -1   -1   -1 
155 */
156     Int_t *idtmed = fIdtmed->GetArray();
157     Int_t imed;
158     
159     imed = kSiO2;   // * Quarz Window        (>1000 keV delta-electrons)
160     gMC->Gstpar(idtmed[imed], "CUTGAM",1.e-4);
161     gMC->Gstpar(idtmed[imed], "CUTELE",1.e-4);
162     gMC->Gstpar(idtmed[imed], "CUTNEU",1.e-4);
163     gMC->Gstpar(idtmed[imed], "CUTMUO",1.e-4);    
164     gMC->Gstpar(idtmed[imed], "DCUTE" ,1.e-3);    
165     gMC->Gstpar(idtmed[imed], "CUTHAD",1.e-3);    
166     
167     gMC->Gstpar(idtmed[imed], "DRAY",1);    
168     gMC->Gstpar(idtmed[imed], "LOSS",1);    
169
170     imed = kC6F14;  // * Freon Radiator      (>  500 keV delta-electrons)
171     gMC->Gstpar(idtmed[imed], "CUTGAM",1.e-4);
172     gMC->Gstpar(idtmed[imed], "CUTELE",1.e-4);
173     gMC->Gstpar(idtmed[imed], "CUTNEU",1.e-4);
174     gMC->Gstpar(idtmed[imed], "CUTMUO",1.e-4);    
175     gMC->Gstpar(idtmed[imed], "DCUTE" ,5.e-4);    
176     gMC->Gstpar(idtmed[imed], "CUTHAD",5.e-4);    
177     
178     gMC->Gstpar(idtmed[imed], "DRAY",1);    
179     gMC->Gstpar(idtmed[imed], "LOSS",1);    
180     
181     imed = kCH4;  // * Methane Gap         (>  100 keV delta-electrons)
182     gMC->Gstpar(idtmed[imed], "CUTGAM",5.e-5);
183     gMC->Gstpar(idtmed[imed], "CUTELE",5.e-5);
184     gMC->Gstpar(idtmed[imed], "CUTNEU",1.e-4);
185     gMC->Gstpar(idtmed[imed], "CUTMUO",1.e-4);    
186     gMC->Gstpar(idtmed[imed], "DCUTE" ,1.e-4);    
187     gMC->Gstpar(idtmed[imed], "CUTHAD",1.e-4);    
188     
189     gMC->Gstpar(idtmed[imed], "DRAY",1);    
190     gMC->Gstpar(idtmed[imed], "LOSS",1);    
191     
192     imed = kCsI;  // * CSI    (>  50 keV delta-electrons)
193     gMC->Gstpar(idtmed[imed], "CUTGAM",1.e-5);
194     gMC->Gstpar(idtmed[imed], "CUTELE",1.e-5);
195     gMC->Gstpar(idtmed[imed], "CUTNEU",1.e-4);
196     gMC->Gstpar(idtmed[imed], "CUTMUO",1.e-4);    
197     gMC->Gstpar(idtmed[imed], "DCUTE" ,5.e-5);    
198     gMC->Gstpar(idtmed[imed], "CUTHAD",5.e-5);    
199     
200     gMC->Gstpar(idtmed[imed], "DRAY",1);    
201     gMC->Gstpar(idtmed[imed], "LOSS",1);
202     
203     imed = kAl;  // * Alluminium    (>  50 keV delta-electrons)
204     gMC->Gstpar(idtmed[imed], "CUTGAM",1.e-5);
205     gMC->Gstpar(idtmed[imed], "CUTELE",1.e-5);
206     gMC->Gstpar(idtmed[imed], "CUTNEU",1.e-4);
207     gMC->Gstpar(idtmed[imed], "CUTMUO",1.e-4);    
208     gMC->Gstpar(idtmed[imed], "DCUTE" ,5.e-5);    
209     gMC->Gstpar(idtmed[imed], "CUTHAD",5.e-5);    
210     
211     gMC->Gstpar(idtmed[imed], "DRAY",1);    
212     gMC->Gstpar(idtmed[imed], "LOSS",1);    
213     
214     imed = kCu;  // * Copper       (>  50 keV delta-electrons)
215     gMC->Gstpar(idtmed[imed], "CUTGAM",1.e-5);
216     gMC->Gstpar(idtmed[imed], "CUTELE",1.e-5);
217     gMC->Gstpar(idtmed[imed], "CUTNEU",1.e-4);
218     gMC->Gstpar(idtmed[imed], "CUTMUO",1.e-4);    
219     gMC->Gstpar(idtmed[imed], "DCUTE" ,5.e-5);    
220     gMC->Gstpar(idtmed[imed], "CUTHAD",5.e-5);    
221     
222     gMC->Gstpar(idtmed[imed], "DRAY",1);    
223     gMC->Gstpar(idtmed[imed], "LOSS",1);    
224     
225     imed = kW;  // * Tungsten     (>  50 keV delta-electrons)
226     gMC->Gstpar(idtmed[imed], "CUTGAM",1.e-5);
227     gMC->Gstpar(idtmed[imed], "CUTELE",1.e-5);
228     gMC->Gstpar(idtmed[imed], "CUTNEU",1.e-4);
229     gMC->Gstpar(idtmed[imed], "CUTMUO",1.e-4);    
230     gMC->Gstpar(idtmed[imed], "DCUTE" ,5.e-5);    
231     gMC->Gstpar(idtmed[imed], "CUTHAD",5.e-5);    
232     
233     gMC->Gstpar(idtmed[imed], "DRAY",1);    
234     gMC->Gstpar(idtmed[imed], "LOSS",1);    
235     
236 }
237 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
238 void AliHMPIDv2::CreateGeometry()
239 {
240 //Creates detailed geometry simulation (currently GEANT volumes tree)         
241   AliDebug(1,"Start main.");
242   if(!gMC->IsRootGeometrySupported()) return;                
243  
244  Double_t cm=1,mm=0.1*cm,um=0.001*mm;//default is cm
245  
246   TGeoMedium *al   =gGeoManager->GetMedium("HMPID_Al");    
247   TGeoMedium *ch4  =gGeoManager->GetMedium("HMPID_CH4");    
248   TGeoMedium *roha =gGeoManager->GetMedium("HMPID_Roha");   
249   TGeoMedium *neoc =gGeoManager->GetMedium("HMPID_Neo");
250   TGeoMedium *c6f14=gGeoManager->GetMedium("HMPID_C6F14");  
251   TGeoMedium *sio2 =gGeoManager->GetMedium("HMPID_SiO2");   
252   TGeoMedium *cu   =gGeoManager->GetMedium("HMPID_Cu");     
253   TGeoMedium *w    =gGeoManager->GetMedium("HMPID_W");      
254   TGeoMedium *csi  =gGeoManager->GetMedium("HMPID_CsI");    
255   TGeoMedium *ar   =gGeoManager->GetMedium("HMPID_Ar");     
256
257   TGeoVolume *hmp=gGeoManager->MakeBox ("Hmp",ch4,1681*mm/2, 1466*mm/2,(2*80*mm+2*60*mm)/2);//2033P1  z from p84 TDR  
258
259   TString title=GetTitle();
260   if(title.Contains("TestBeam")){
261     gGeoManager->GetVolume("ALIC")->AddNode(hmp,0);
262   }else{
263     for(Int_t iCh=AliHMPIDParam::kMinCh;iCh<=AliHMPIDParam::kMaxCh;iCh++){//place 7 chambers
264       TGeoHMatrix *pMatrix=new TGeoHMatrix;
265       IdealPosition(iCh,pMatrix);
266       gGeoManager->GetVolume("ALIC")->AddNode(hmp,iCh,pMatrix);
267     }
268   }
269
270   TGeoRotation *rot=new TGeoRotation("HwireRot"); rot->RotateY(90); //rotate wires around Y to be along X (initially along Z)
271   TGeoVolume *sbo=gGeoManager->MakeBox ("Hsbo",ch4  , 1419*mm/2 , 1378.00*mm/2 ,   50.5*mm/2);//2072P1
272   TGeoVolume *cov=gGeoManager->MakeBox ("Hcov",al   , 1419*mm/2 , 1378.00*mm/2 ,    0.5*mm/2);  
273   TGeoVolume *hon=gGeoManager->MakeBox ("Hhon",roha , 1359*mm/2 , 1318.00*mm/2 ,   49.5*mm/2);  
274   TGeoVolume *rad=gGeoManager->MakeBox ("Hrad",c6f14, 1330*mm/2 ,  413.00*mm/2 ,   24.0*mm/2); //2011P1
275   TGeoVolume *neo=gGeoManager->MakeBox ("Hneo",neoc , 1330*mm/2 ,  413.00*mm/2 ,    4.0*mm/2); 
276   TGeoVolume *win=gGeoManager->MakeBox ("Hwin",sio2 , 1330*mm/2 ,  413.00*mm/2 ,    5.0*mm/2); 
277   TGeoVolume *si1=gGeoManager->MakeBox ("Hsi1",sio2 , 1330*mm/2 ,    5.00*mm/2 ,   15.0*mm/2);    
278   TGeoVolume *si2=gGeoManager->MakeBox ("Hsi2",neoc ,   10*mm/2 ,  403.00*mm/2 ,   15.0*mm/2);    
279   TGeoVolume *spa=gGeoManager->MakeTube("Hspa",sio2 ,    0*mm   ,    5.00*mm   ,   15.0*mm/2);         
280   TGeoVolume *fr4=gGeoManager->MakeBox ("Hfr4",ch4  , 1407*mm/2 , 1366.00*mm/2 ,   15.0*mm/2);//2043P1 
281   TGeoVolume *f4a=gGeoManager->MakeBox ("Hf4a",al   , 1407*mm/2 , 1366.00*mm/2 ,   10.0*mm/2); 
282   TGeoVolume *f4i=gGeoManager->MakeBox ("Hf4i",ch4  , 1323*mm/2 , 1296.00*mm/2 ,   10.0*mm/2); 
283   TGeoVolume *col=gGeoManager->MakeTube("Hcol",cu   ,    0*mm   ,  100.00*um   , 1323.0*mm/2);
284   TGeoVolume *sec=gGeoManager->MakeBox ("Hsec",ch4  ,  648*mm/2 ,  411.00*mm/2 ,   6.2*mm/2);//sec=gap
285  
286   Double_t cellx=8.04*mm,celly=8.4*mm;  Int_t nPadX=80, nPadY=48; 
287   TGeoVolume *gap=gGeoManager->MakeBox ("Hgap",ch4  ,  cellx*nPadX/2 ,  celly*nPadY/2 ,    6.2*mm/2); //x=8.04*80 y=8.4*48 z=pad+pad-ano+marign 2006p1  
288   TGeoVolume *row=        gap->Divide  ("Hrow",2,nPadY,0,0);//along Y->48 rows
289   TGeoVolume *cel=        row->Divide  ("Hcel",1,nPadX,0,0);//along X->80 cells
290   TGeoVolume *cat=gGeoManager->MakeTube("Hcat",cu   ,    0.00*mm   ,   50.00*um   ,    cellx/2); 
291   TGeoVolume *ano=gGeoManager->MakeTube("Hano",w    ,    0.00*mm   ,   20.00*um   ,    cellx/2); 
292   TGeoVolume *pad=gGeoManager->MakeBox ("Hpad",csi  ,    7.54*mm/2 ,    7.90*mm/2 ,    1.7*mm/2); //2006P1 PCB material...     
293   TGeoVolume *fr1=gGeoManager->MakeBox ("Hfr1",al   , 1463*mm/2 , 1422.00*mm/2 ,   58.3*mm/2);//2040P1
294   TGeoVolume *fr1up=gGeoManager->MakeBox ("Hfr1up",ch4,(1426.00-37.00)*mm/2 , (1385.00-37.00)*mm/2 ,    20.0*mm/2);//2040P1
295   TGeoVolume *fr1perUpBig=gGeoManager->MakeBox ("Hfr1perUpBig",ch4,1389*mm/2,35*mm/2,10*mm/2);    
296   TGeoVolume *fr1perUpSma=gGeoManager->MakeBox ("Hfr1perUpSma",ch4,35*mm/2,(1385-37-2*35)*mm/2,10*mm/2);
297         TGeoVolume *fr1perDowBig=gGeoManager->MakeBox ("Hfr1perDowBig",ch4,1389*mm/2,46*mm/2,2.3*mm/2);    
298   TGeoVolume *fr1perDowSma=gGeoManager->MakeBox ("Hfr1perDowSma",ch4,46*mm/2,(1385-37-2*46)*mm/2,2.3*mm/2);
299         
300         TGeoVolume *ppf=gGeoManager->MakeBox ("Hppf",al   ,  648*mm/2 ,  411.00*mm/2 ,   38.3*mm/2);//2001P2
301   TGeoVolume *lar=gGeoManager->MakeBox ("Hlar",ar   ,  181*mm/2 ,   89.25*mm/2 ,   38.3*mm/2);//2001P2
302   TGeoVolume *smo=gGeoManager->MakeBox ("Hsmo",ar   ,  114*mm/2 ,   89.25*mm/2 ,   38.3*mm/2);//2001P2
303                 
304
305                 
306         TGeoVolume *fr3=   gGeoManager->MakeBox("Hfr3",          al,  1463*mm/2,  1422*mm/2,  34*mm/2);//2041P1
307    TGeoVolume *fr3up=    gGeoManager->MakeBox("Hfr3up",     ch4, 1323*mm/2,  1282*mm/2,  20*mm/2);//2041P1
308    TGeoVolume *fr3down=gGeoManager->MakeBox("Hfr3down", ch4, 1437*mm/2,  1370*mm/2,  14*mm/2);//2041P1
309
310
311
312 // ^ Y   z=         z=-12mm      z=98.25mm               ALIC->7xHmp (virtual)-->1xHsbo (virtual) --->2xHcov (real) 2072P1
313 // |  ____________________________________                                    |                   |-->1xHhon (real) 2072P1
314 // | |   ______     ____          ______  |                                   |
315 //   |  |      |   |    |   *    |      | |                                   |->3xHrad (virtual) --->1xHneo (real) 2011P1
316 //   |  |50.5mm|   |24mm|   *    |45.5mm| |                                   |                   |-->1xHwin (real) 2011P1
317 //   |  |      |   |    |   *    |      | |                                   |                   |-->2xHsi1 (real) 2011P1
318 //   |  |      |   |____|   *    |______| |                                   |                   |-->2xHsi2 (real) 2011P1
319 //   |  |      |    ____    *     ______  |                                   |                   |->30xHspa (real) 2011P1
320 //   |  |      |   |    |   *    |      | |                                   |
321 //   |  |      |   |    |   *    |      | |                                   |->1xHfr4 (vitual) --->1xHf4a (real)---->1xHf4i(virtual) 2043P1 
322 //   |  |  sb  |   | rad|   *    |      | |                                   |                  |-->322xHcol (real) 2043P1
323 //   |  |      |   |____|   *    |______| |                                   |
324 //   |  |      |    ____    *     ______  |                                   |->1xHfr1 (real) --> 6xHppf(real) ---->8xHlar (virtual) 2001P1
325 //   |  |      |   |    |   *    |      | |                                   |                                     |--->8xHsmo (virtual) 2001P1     
326 //   |  |      |   |    |   *    |      | |                                   |               
327 //   |  |      |   |    |   *    |      | |                                   |-> 6xHgap (virtual) --->48xHrow (virtual) -->80xHcel (virtual) -->4xHcat (real) from p84 TDR 
328 //   |  |______|   |____|   *    |______| |                                                                                                  |-->2xHano (real) from p84 TDR                                  
329 //   |____________________________________|                                                                                                  |-->1xHpad (real) from p84 TDR 
330 //                                                       --->Z 
331   hmp->AddNode(sbo ,1,new TGeoTranslation(   0*mm,   0*mm, -73.75*mm));                     //p.84 TDR
332      sbo->AddNode(hon ,1,new TGeoTranslation(  0*mm,0*mm,      0*mm)); //2072P1
333      sbo->AddNode(cov ,1,new TGeoTranslation(  0*mm,0*mm,    +25*mm)); 
334      sbo->AddNode(cov ,2,new TGeoTranslation(  0*mm,0*mm,    -25*mm)); 
335   hmp->AddNode(rad,2,new TGeoTranslation(   0*mm,+434*mm, -12.00*mm)); 
336   hmp->AddNode(rad,1,new TGeoTranslation(   0*mm,   0*mm, -12.00*mm)); 
337   hmp->AddNode(rad,0,new TGeoTranslation(   0*mm,-434*mm, -12.00*mm)); 
338     rad->AddNode(neo,1,new TGeoTranslation(   0*mm,   0*mm, -10.0*mm));
339     rad->AddNode(win,1,new TGeoTranslation(   0*mm,   0*mm,   9.5*mm));
340     rad->AddNode(si1,1,new TGeoTranslation(   0*mm,-204*mm,  -0.5*mm)); rad->AddNode(si1,2,new TGeoTranslation(   0*mm,+204*mm,  -0.5*mm));
341     rad->AddNode(si2,1,new TGeoTranslation(-660*mm,   0*mm,  -0.5*mm)); rad->AddNode(si2,2,new TGeoTranslation(+660*mm,   0*mm,  -0.5*mm));
342     for(Int_t i=0;i<3;i++) for(Int_t j=0;j<10;j++) rad->AddNode(spa,10*i+j,new TGeoTranslation(-1330*mm/2+116*mm+j*122*mm,(i-1)*105*mm,-0.5*mm));
343   hmp->AddNode(fr4,1,new TGeoTranslation(   0*mm,   0*mm,   9.00*mm));                     //p.84 TDR
344   for(int i=1;i<=322;i++)  fr4->AddNode(col,i,new TGeoCombiTrans( 0*mm, -1296/2*mm+i*4*mm,-5*mm,rot)); //F4 2043P1
345                            fr4->AddNode(f4a,1,new TGeoTranslation(   0*mm,0*mm, 2.5*mm));    
346                                         f4a->AddNode(f4i,1,new TGeoTranslation(   0*mm,0*mm,   0*mm));
347   hmp->AddNode(sec,4,new TGeoTranslation(-335*mm,+433*mm,  78.6*mm)); hmp->AddNode(sec,5,new TGeoTranslation(+335*mm,+433*mm,  78.6*mm));
348   hmp->AddNode(sec,2,new TGeoTranslation(-335*mm,   0*mm,  78.6*mm)); hmp->AddNode(sec,3,new TGeoTranslation(+335*mm,   0*mm,  78.6*mm));
349   hmp->AddNode(sec,0,new TGeoTranslation(-335*mm,-433*mm,  78.6*mm)); hmp->AddNode(sec,1,new TGeoTranslation(+335*mm,-433*mm,  78.6*mm));
350     sec->AddNode(gap,1,new TGeoTranslation(0,0,0.*mm));
351       cel->AddNode(cat,1,new TGeoCombiTrans (0,  3.15*mm , -2.70*mm , rot)); //4 cathode wires
352       cel->AddNode(ano,1,new TGeoCombiTrans (0,  2.00*mm , -0.29*mm , rot)); //2 anod wires
353       cel->AddNode(cat,2,new TGeoCombiTrans (0,  1.05*mm , -2.70*mm , rot)); 
354       cel->AddNode(cat,3,new TGeoCombiTrans (0, -1.05*mm , -2.70*mm , rot)); 
355       cel->AddNode(ano,2,new TGeoCombiTrans (0, -2.00*mm , -0.29*mm , rot)); 
356       cel->AddNode(cat,4,new TGeoCombiTrans (0, -3.15*mm , -2.70*mm , rot));   
357       cel->AddNode(pad,1,new TGeoTranslation(0,  0.00*mm ,  2.25*mm));       //1 pad  
358             
359   hmp->AddNode(fr1,1,new TGeoTranslation(0.,0.,(80.+1.7)*mm+58.3*mm/2.));
360                 fr1->AddNode(fr1up,1,new TGeoTranslation(0.,0.,(58.3*mm-20.00*mm)/2.));
361                 
362                 fr1->AddNode(fr1perUpBig,0,new TGeoTranslation(0.,(1385-37-35)*mm/2.,(58.3*mm-20.00*2*mm-10.0*mm)/2.));
363                 fr1->AddNode(fr1perUpSma,0,new TGeoTranslation((1426-37-35)*mm/2.,0.,(58.3*mm-20.00*2*mm-10.0*mm)/2.));
364                 fr1->AddNode(fr1perUpBig,1,new TGeoTranslation(0.,-(1385-37-35)*mm/2.,(58.3*mm-20.00*2*mm-10.0*mm)/2.));
365                 fr1->AddNode(fr1perUpSma,1,new TGeoTranslation(-(1426-37-35)*mm/2.,0.,(58.3*mm-20.00*2*mm-10.0*mm)/2.));
366                 
367           fr1->AddNode(fr1perDowBig,0,new TGeoTranslation(0.,(1385-37-46)*mm/2.,(-58.3*mm+2.3*mm)/2.));
368                 fr1->AddNode(fr1perDowSma,0,new TGeoTranslation((1426-37-46)*mm/2.,0.,(-58.3*mm+2.3*mm)/2.));
369           fr1->AddNode(fr1perDowBig,1,new TGeoTranslation(0.,-(1385-37-46)*mm/2.,(-58.3*mm+2.3*mm)/2.));
370                 fr1->AddNode(fr1perDowSma,1,new TGeoTranslation(-(1426-37-46)*mm/2.,0.,(-58.3*mm+2.3*mm)/2.));
371                 
372                         
373           fr1->AddNode(ppf,4,new TGeoTranslation(-335*mm,433*mm,(-58.3+38.3)*mm/2.));  fr1->AddNode(ppf,5,new TGeoTranslation(335*mm,433*mm,(-58.3+38.3)*mm/2.));       
374           fr1->AddNode(ppf,2,new TGeoTranslation(-335*mm,0.,(-58.3+38.3)*mm/2.));      fr1->AddNode(ppf,3,new TGeoTranslation(335*mm,0.,(-58.3+38.3)*mm/2.));
375           fr1->AddNode(ppf,0,new TGeoTranslation(-335*mm,-433*mm,(-58.3+38.3)*mm/2.)); fr1->AddNode(ppf,1,new TGeoTranslation(335*mm,-433*mm,(-58.3+38.3)*mm/2.));
376                 
377                 
378                 
379                 
380                 
381                 
382 // ^ Y  single cell                                                5.5mm CH4 = 1*mm CsI + 4.45*mm CsI x cath +0.05*mm safety margin         
383 // |      ______________________________           
384 // |     |                              |          ^                            ||     
385 //       |                              | 1.05mm                                ||     
386 // 2.2*mm| xxxxxxxxxxxxxxxxxxxxxxxxxxxx |--              50um  x                || cat shift  x=0mm , y= 3.15mm , z=-2.70mm       
387 //       |                              |                                       ||     
388 //       |                              |                                       ||     
389 // __    |  ..........................  | 2.1mm                    20un .       ||  ano shift x=0mm , y= 2.00mm , z=-0.29mm   
390 //       |                              |                                       ||     
391 //       |                              |                                       ||     
392 //       | xxxxxxxxxxxxxxxxxxxxxxxxxxxx |--                    x                ||  cat shift x=0mm , y= 1.05mm , z=-2.70mm   
393 //       |                              |                                       ||     
394 //       |                              |         8.4mm                         ||   
395 // 4*mm  |                              | 2.1mm                                 ||  pad shift x=0mm , y= 0.00mm , z=2.25*mm   
396 //       |                              |                                       ||  
397 //       |                              |                                       ||  
398 //       | xxxxxxxxxxxxxxxxxxxxxxxxxxxx |--                    x                ||  cat shift x=0mm , y=-1.05mm , z=-2.70mm   
399 //       |                              |                                       ||  
400 //       |                              |                                       ||    
401 // __    |  ..........................  | 2.1mm                         . 2.04mm||  ano shift x=0mm , y=-2.00mm , z=-0.29mm   
402 //       |                              |                                       ||  
403 //       |                              |                                       ||  
404 //       | xxxxxxxxxxxxxxxxxxxxxxxxxxxx |--                    x    4.45mm      ||  cat shift x=0mm , y=-3.15mm , z=-2.70mm   
405 // 2.2*mm|                              |                                       ||  
406 //       |                              | 1.05mm                                ||         
407 //       |______________________________|          v                            ||    
408 //       <             8 mm             >                          
409 //                                   ----->X                                 ----->Z
410   ppf->AddNode(lar,0,new TGeoTranslation(-224.5*mm,-151.875*mm,  0.*mm));
411   ppf->AddNode(lar,1,new TGeoTranslation(-224.5*mm,- 50.625*mm,  0.*mm));
412   ppf->AddNode(lar,2,new TGeoTranslation(-224.5*mm,+ 50.625*mm,  0.*mm));
413   ppf->AddNode(lar,3,new TGeoTranslation(-224.5*mm,+151.875*mm,  0.*mm));
414   ppf->AddNode(lar,4,new TGeoTranslation(+224.5*mm,-151.875*mm,  0.*mm));
415   ppf->AddNode(lar,5,new TGeoTranslation(+224.5*mm,- 50.625*mm,  0.*mm));
416   ppf->AddNode(lar,6,new TGeoTranslation(+224.5*mm,+ 50.625*mm,  0.*mm));
417   ppf->AddNode(lar,7,new TGeoTranslation(+224.5*mm,+151.875*mm,  0.*mm));
418   ppf->AddNode(smo,0,new TGeoTranslation(- 65.0*mm,-151.875*mm,  0.*mm));
419   ppf->AddNode(smo,1,new TGeoTranslation(- 65.0*mm,- 50.625*mm,  0.*mm));
420   ppf->AddNode(smo,2,new TGeoTranslation(- 65.0*mm,+ 50.625*mm,  0.*mm));
421   ppf->AddNode(smo,3,new TGeoTranslation(- 65.0*mm,+151.875*mm,  0.*mm));
422   ppf->AddNode(smo,4,new TGeoTranslation(+ 65.0*mm,-151.875*mm,  0.*mm));
423   ppf->AddNode(smo,5,new TGeoTranslation(+ 65.0*mm,- 50.625*mm,  0.*mm));
424   ppf->AddNode(smo,6,new TGeoTranslation(+ 65.0*mm,+ 50.625*mm,  0.*mm));
425   ppf->AddNode(smo,7,new TGeoTranslation(+ 65.0*mm,+151.875*mm,  0.*mm)); 
426
427 hmp->AddNode(fr3,1,new TGeoTranslation(0.,0.,(80.-29.)*mm-34.*mm/2));
428          fr3->AddNode( fr3up,1,    new TGeoTranslation(0.,  0.,  7*mm));
429          fr3->AddNode(fr3down,1,new TGeoTranslation(0.,  0., -10*mm));  
430
431   AliDebug(1,"Stop v2. HMPID option");  
432 }//CreateGeometry()
433 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
434 void AliHMPIDv2::Init()
435 {
436 // This method defines ID for sensitive volumes, i.e. such geometry volumes for which there are if(gMC->CurrentVolID()==XXX) 
437 // statements in StepManager()
438 // Arguments: none
439 //   Returns: none      
440   AliDebug(1,"Start v2 HMPID.");    
441   fIdPad     = gMC->VolId("Hpad");
442   fIdCell    = gMC->VolId("Hcel");
443   AliDebug(1,"Stop v2 HMPID.");    
444 }
445 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
446 void AliHMPIDv2::DefineOpticalProperties()
447 {
448 // Optical properties definition.
449   const Int_t kNbins=30;       //number of photon energy points
450   Float_t emin=5.5,emax=8.5;         //Photon energy range,[eV]
451   Float_t aEckov [kNbins]; 
452   Double_t dEckov [kNbins]; 
453   Float_t aAbsRad[kNbins], aAbsWin[kNbins], aAbsGap[kNbins], aAbsMet[kNbins];
454   Float_t aIdxRad[kNbins], aIdxWin[kNbins], aIdxGap[kNbins], aIdxMet[kNbins], aIdxPc[kNbins]; 
455   Float_t                                                    aQeAll [kNbins], aQePc [kNbins];
456   Double_t dReflMet[kNbins], dQePc[kNbins];
457
458   TF2 *pRaIF=new TF2("HidxRad","sqrt(1+0.554*(1239.84/x)^2/((1239.84/x)^2-5769)-0.0005*(y-20))"                                       ,emin,emax,0,50); //DiMauro mail temp 0-50 degrees C
459   TF1 *pWiIF=new TF1("HidxWin","sqrt(1+46.411/(10.666*10.666-x*x)+228.71/(18.125*18.125-x*x))"                                        ,emin,emax);      //SiO2 idx TDR p.35
460   TF1 *pGaIF=new TF1("HidxGap","1+0.12489e-6/(2.62e-4 - x*x/1239.84/1239.84)"                                                         ,emin,emax);      //?????? from where  
461
462   TF1 *pRaAF=new TF1("HabsRad","(x<7.8)*(gaus+gaus(3))+(x>=7.8)*0.0001"                                                               ,emin,emax);  //fit from DiMauro data 28.10.03 
463   pRaAF->SetParameters(3.20491e16,-0.00917890,0.742402,3035.37,4.81171,0.626309);
464   TF1 *pWiAF=new TF1("HabsWin","(x<8.2)*(818.8638-301.0436*x+36.89642*x*x-1.507555*x*x*x)+(x>=8.2)*0.0001"                            ,emin,emax);  //fit from DiMauro data 28.10.03 
465   TF1 *pGaAF=new TF1("HabsGap","(x<7.75)*6512.399+(x>=7.75)*3.90743e-2/(-1.655279e-1+6.307392e-2*x-8.011441e-3*x*x+3.392126e-4*x*x*x)",emin,emax);  //????? from where  
466   
467   TF1 *pQeF =new TF1("Hqe"    ,"0+(x>6.07267)*0.344811*(1-exp(-1.29730*(x-6.07267)))"                                                 ,emin,emax);  //fit from DiMauro data 28.10.03  
468                    
469   TString title=GetTitle();
470   Bool_t isFlatIdx=title.Contains("FlatIdx"); 
471   
472   for(Int_t i=0;i<kNbins;i++){
473     Float_t eV=emin+0.1*i;  //Ckov energy in eV
474     aEckov [i] =1e-9*eV;    //Ckov energy in GeV
475     dEckov [i] = aEckov[i];
476     aAbsRad[i]=pRaAF->Eval(eV); (isFlatIdx)? aIdxRad[i]=1.292: aIdxRad[i]=pRaIF->Eval(eV,20);     
477     aAbsWin[i]=pWiAF->Eval(eV);              aIdxWin[i]=pWiIF->Eval(eV);
478     aAbsGap[i]=pGaAF->Eval(eV);              aIdxGap[i]=pGaIF->Eval(eV);   
479     aQeAll[i] =1;                     //QE for all other materials except for PC must be 1.  
480     aAbsMet[i] =0.0001;                aIdxMet[i]=0;                                             //metal ref idx must be 0 in order to reflect photon
481                                        aIdxPc [i]=1;           aQePc [i]=pQeF->Eval(eV);         //PC ref idx must be 1 in order to apply photon to QE conversion 
482     dQePc [i]=pQeF->Eval(eV);
483     dReflMet[i] = 0.;     // no reflection on the surface of the pc (?)                                       
484   }
485   gMC->SetCerenkov((*fIdtmed)[kC6F14]    , kNbins, aEckov, aAbsRad  , aQeAll , aIdxRad );    
486   gMC->SetCerenkov((*fIdtmed)[kSiO2]     , kNbins, aEckov, aAbsWin  , aQeAll , aIdxWin );    
487   gMC->SetCerenkov((*fIdtmed)[kCH4]      , kNbins, aEckov, aAbsGap  , aQeAll , aIdxGap );    
488   gMC->SetCerenkov((*fIdtmed)[kCu]       , kNbins, aEckov, aAbsMet  , aQeAll , aIdxMet );    
489   gMC->SetCerenkov((*fIdtmed)[kW]        , kNbins, aEckov, aAbsMet  , aQeAll , aIdxMet ); //n=0 means reflect photons       
490   gMC->SetCerenkov((*fIdtmed)[kCsI]      , kNbins, aEckov, aAbsMet  , aQePc  , aIdxPc  ); //n=1 means convert photons    
491   gMC->SetCerenkov((*fIdtmed)[kAl]       , kNbins, aEckov, aAbsMet  , aQeAll , aIdxMet );    
492
493   // Define a skin surface for the photocatode to enable 'detection' in G4
494   gMC->DefineOpSurface("surfPc", kGlisur /*kUnified*/,kDielectric_metal,kPolished, 0.);
495   gMC->SetMaterialProperty("surfPc", "EFFICIENCY", kNbins, dEckov, dQePc);
496   gMC->SetMaterialProperty("surfPc", "REFLECTIVITY", kNbins, dEckov, dReflMet);
497   gMC->SetSkinSurface("skinPc", "Rpc", "surfPc");
498
499   delete pRaAF;delete pWiAF;delete pGaAF; delete pRaIF; delete pWiIF; delete pGaIF; delete pQeF;
500 }
501 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
502 Bool_t AliHMPIDv2::IsLostByFresnel()
503 {
504 // Calculate probability for the photon to be lost by Fresnel reflection.
505   TLorentzVector p4;
506   Double_t mom[3],localMom[3];
507   gMC->TrackMomentum(p4);   mom[0]=p4(1);   mom[1]=p4(2);   mom[2]=p4(3);
508   localMom[0]=0; localMom[1]=0; localMom[2]=0;
509   gMC->Gmtod(mom,localMom,2);
510   Double_t localTc    = localMom[0]*localMom[0]+localMom[2]*localMom[2];
511   Double_t localTheta = TMath::ATan2(TMath::Sqrt(localTc),localMom[1]);
512   Double_t cotheta = TMath::Abs(TMath::Cos(localTheta));
513   if(gMC->GetRandom()->Rndm() < Fresnel(p4.E()*1e9,cotheta,1)){
514     AliDebug(1,"Photon lost");
515     return kTRUE;
516   }else
517     return kFALSE;
518 }//IsLostByFresnel()
519 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
520 void AliHMPIDv2::GenFee(Float_t qtot)
521 {
522 // Generate FeedBack photons for the current particle. To be invoked from StepManager().
523 // eloss=0 means photon so only pulse height distribution is to be analysed.
524   TLorentzVector x4;
525   gMC->TrackPosition(x4); 
526   Int_t iNphotons=gMC->GetRandom()->Poisson(0.02*qtot);  //# of feedback photons is proportional to the charge of hit
527   AliDebug(1,Form("N photons=%i",iNphotons));
528   Int_t j;
529   Float_t cthf, phif, enfp = 0, sthf, e1[3], e2[3], e3[3], vmod, uswop,dir[3], phi,pol[3], mom[4];
530 //Generate photons
531   for(Int_t i=0;i<iNphotons;i++){//feedbacks loop
532     Double_t ranf[2];
533     gMC->GetRandom()->RndmArray(2,ranf);    //Sample direction
534     cthf=ranf[0]*2-1.0;
535     if(cthf<0) continue;
536     sthf = TMath::Sqrt((1 - cthf) * (1 + cthf));
537     phif = ranf[1] * 2 * TMath::Pi();
538     
539     if(Double_t randomNumber=gMC->GetRandom()->Rndm()<=0.57)
540       enfp = 7.5e-9;
541     else if(randomNumber<=0.7)
542       enfp = 6.4e-9;
543     else
544       enfp = 7.9e-9;
545     
546
547     dir[0] = sthf * TMath::Sin(phif);    dir[1] = cthf;    dir[2] = sthf * TMath::Cos(phif);
548     gMC->Gdtom(dir, mom, 2);
549     mom[0]*=enfp;    mom[1]*=enfp;    mom[2]*=enfp;
550     mom[3] = TMath::Sqrt(mom[0]*mom[0]+mom[1]*mom[1]+mom[2]*mom[2]);
551     
552     // Polarisation
553     e1[0]=      0;    e1[1]=-dir[2];    e1[2]= dir[1];
554     e2[0]=-dir[1];    e2[1]= dir[0];    e2[2]=      0;
555     e3[0]= dir[1];    e3[1]=      0;    e3[2]=-dir[0];
556     
557     vmod=0;
558     for(j=0;j<3;j++) vmod+=e1[j]*e1[j];
559     if (!vmod) for(j=0;j<3;j++) {
560       uswop=e1[j];
561       e1[j]=e3[j];
562       e3[j]=uswop;
563     }
564     vmod=0;
565     for(j=0;j<3;j++) vmod+=e2[j]*e2[j];
566     if (!vmod) for(j=0;j<3;j++) {
567       uswop=e2[j];
568       e2[j]=e3[j];
569       e3[j]=uswop;
570     }
571     
572     vmod=0;  for(j=0;j<3;j++) vmod+=e1[j]*e1[j];  vmod=TMath::Sqrt(1/vmod);  for(j=0;j<3;j++) e1[j]*=vmod;    
573     vmod=0;  for(j=0;j<3;j++) vmod+=e2[j]*e2[j];  vmod=TMath::Sqrt(1/vmod);  for(j=0;j<3;j++) e2[j]*=vmod;
574     
575     phi = gMC->GetRandom()->Rndm()* 2 * TMath::Pi();
576     for(j=0;j<3;j++) pol[j]=e1[j]*TMath::Sin(phi)+e2[j]*TMath::Cos(phi);
577     gMC->Gdtom(pol, pol, 2);
578     Int_t outputNtracksStored;    
579     gAlice->GetMCApp()->PushTrack(1,                             //transport
580                      gAlice->GetMCApp()->GetCurrentTrackNumber(),//parent track 
581                      50000051,                                   //PID
582                      mom[0],mom[1],mom[2],mom[3],                //track momentum  
583                      x4.X(),x4.Y(),x4.Z(),x4.T(),                //track origin 
584                      pol[0],pol[1],pol[2],                       //polarization
585                      kPFeedBackPhoton,                           //process ID   
586                      outputNtracksStored,                        //on return how many new photons stored on stack
587                      1.0);                                       //weight
588   }//feedbacks loop
589   AliDebug(1,"Stop.");
590 }//GenerateFeedbacks()
591 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
592 void AliHMPIDv2::Hits2SDigits()
593 {
594 // Interface method ivoked from AliSimulation to create a list of sdigits corresponding to list of hits. Every hit generates one or more sdigits.
595 // Arguments: none
596 //   Returns: none   
597   AliDebug(1,"Start.");
598   for(Int_t iEvt=0;iEvt < GetLoader()->GetRunLoader()->GetNumberOfEvents();iEvt++){                //events loop
599     GetLoader()->GetRunLoader()->GetEvent(iEvt);                          //get next event
600   
601     if(!GetLoader()->TreeH()) {GetLoader()->LoadHits();                    }
602     if(!GetLoader()->TreeS()) {GetLoader()->MakeTree("S"); MakeBranch("S");}//to
603           
604     for(Int_t iEnt=0;iEnt<GetLoader()->TreeH()->GetEntries();iEnt++){//prims loop
605       GetLoader()->TreeH()->GetEntry(iEnt);
606       Hit2Sdi(Hits(),SdiLst());
607     }//prims loop
608     GetLoader()->TreeS()->Fill();
609     GetLoader()->WriteSDigits("OVERWRITE");
610     SdiReset();
611   }//events loop  
612   GetLoader()->UnloadHits();
613   GetLoader()->UnloadSDigits();  
614   AliDebug(1,"Stop.");
615 }//Hits2SDigits()
616 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
617 void AliHMPIDv2::Hit2Sdi(TClonesArray *pHitLst,TClonesArray *pSdiLst)
618 {
619 // Converts list of hits to list of sdigits. 
620 // Arguments: pHitLst  - list of hits provided not empty
621 //            pSDigLst - list of sdigits where to store the results
622 //   Returns: none         
623   for(Int_t iHit=0;iHit<pHitLst->GetEntries();iHit++){         //hits loop
624     AliHMPIDHit *pHit=(AliHMPIDHit*)pHitLst->At(iHit);         //get pointer to current hit   
625     pHit->Hit2Sdi(pSdiLst);                                    //convert this hit to list of sdigits     
626   }//hits loop loop
627 }//Hits2Sdi()
628 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
629 void AliHMPIDv2::Digits2Raw()
630 {
631 // Interface method invoked by AliSimulation to create raw data streams from digits. Events loop is done in AliSimulation
632 // Arguments: none
633 //   Returns: none    
634   AliDebug(1,"Start.");
635   GetLoader()->LoadDigits();
636   TTree * treeD = GetLoader()->TreeD();
637   if(!treeD) {
638     AliError("No digits tree!");
639     return;
640   }
641   treeD->GetEntry(0);
642   
643   
644   AliHMPIDRawStream *pRS=0x0;
645   pRS->WriteRaw(DigLst());
646    
647   GetLoader()->UnloadDigits();
648   AliDebug(1,"Stop.");      
649 }//Digits2Raw()
650 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
651 Float_t AliHMPIDv2::Fresnel(Float_t ene,Float_t pdoti, Bool_t pola)
652 {
653 // Correction for Fresnel   ???????????
654 // Arguments:   ene - photon energy [GeV],
655 //              PDOTI=COS(INC.ANG.), PDOTR=COS(POL.PLANE ROT.ANG.)
656 //   Returns:  
657     Float_t en[36] = {5.0,5.1,5.2,5.3,5.4,5.5,5.6,5.7,5.8,5.9,6.0,6.1,6.2,
658                       6.3,6.4,6.5,6.6,6.7,6.8,6.9,7.0,7.1,7.2,7.3,7.4,7.5,7.6,7.7,
659                       7.8,7.9,8.0,8.1,8.2,8.3,8.4,8.5};
660     Float_t csin[36] = {2.14,2.21,2.33,2.48,2.76,2.97,2.99,2.59,2.81,3.05,
661                         2.86,2.53,2.55,2.66,2.79,2.96,3.18,3.05,2.84,2.81,2.38,2.11,
662                         2.01,2.13,2.39,2.73,3.08,3.15,2.95,2.73,2.56,2.41,2.12,1.95,
663                         1.72,1.53};
664     Float_t csik[36] = {0.,0.,0.,0.,0.,0.196,0.408,0.208,0.118,0.49,0.784,0.543,
665                         0.424,0.404,0.371,0.514,0.922,1.102,1.139,1.376,1.461,1.253,0.878,
666                         0.69,0.612,0.649,0.824,1.347,1.571,1.678,1.763,1.857,1.824,1.824,
667                         1.714,1.498};
668     Float_t xe=ene;
669     Int_t  j=Int_t(xe*10)-49;
670     Float_t cn=csin[j]+((csin[j+1]-csin[j])/0.1)*(xe-en[j]);
671     Float_t ck=csik[j]+((csik[j+1]-csik[j])/0.1)*(xe-en[j]);
672
673     //FORMULAE FROM HANDBOOK OF OPTICS, 33.23 OR
674     //W.R. HUNTER, J.O.S.A. 54 (1964),15 , J.O.S.A. 55(1965),1197
675
676     Float_t sinin=TMath::Sqrt(1-pdoti*pdoti);
677     Float_t tanin=sinin/pdoti;
678
679     Float_t c1=cn*cn-ck*ck-sinin*sinin;
680     Float_t c2=4*cn*cn*ck*ck;
681     Float_t aO=TMath::Sqrt(0.5*(TMath::Sqrt(c1*c1+c2)+c1));
682     Float_t b2=0.5*(TMath::Sqrt(c1*c1+c2)-c1);
683     
684     Float_t rs=((aO-pdoti)*(aO-pdoti)+b2)/((aO+pdoti)*(aO+pdoti)+b2);
685     Float_t rp=rs*((aO-sinin*tanin)*(aO-sinin*tanin)+b2)/((aO+sinin*tanin)*(aO+sinin*tanin)+b2);
686     
687
688     //CORRECTION FACTOR FOR SURFACE ROUGHNESS
689     //B.J. STAGG  APPLIED OPTICS, 30(1991),4113
690
691     Float_t sigraf=18.;
692     Float_t lamb=1240/ene;
693     Float_t fresn;
694  
695     Float_t  rO=TMath::Exp(-(4*TMath::Pi()*pdoti*sigraf/lamb)*(4*TMath::Pi()*pdoti*sigraf/lamb));
696
697     if(pola)
698     {
699         Float_t pdotr=0.8;                                 //DEGREE OF POLARIZATION : 1->P , -1->S
700         fresn=0.5*(rp*(1+pdotr)+rs*(1-pdotr));
701     }
702     else
703         fresn=0.5*(rp+rs);
704       
705     fresn = fresn*rO;
706     return fresn;
707 }//Fresnel()
708 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
709 void AliHMPIDv2::Print(Option_t *option)const
710 {
711 // Debug printout
712   TObject::Print(option);
713 }//void AliHMPID::Print(Option_t *option)const
714 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
715 Bool_t AliHMPIDv2::Raw2SDigits(AliRawReader *pRR)
716 {
717 // Interface methode ivoked from AliSimulation to create a list of sdigits from raw digits. Events loop is done in AliSimulation
718 // Arguments: pRR- raw reader 
719 //   Returns: kTRUE on success (currently ignored in AliSimulation::ConvertRaw2SDigits())      
720   //AliHMPIDDigit sdi; //tmp sdigit, raw digit will be converted to it
721   
722   if(!GetLoader()->TreeS()) {MakeTree("S");  MakeBranch("S");}
723     
724   TClonesArray *pSdiLst=SdiLst(); Int_t iSdiCnt=0; //tmp list of sdigits for all chambers
725   AliHMPIDRawStream stream(pRR);
726   while(stream.Next())
727   {
728     for(Int_t iPad=0;iPad<stream.GetNPads();iPad++) {
729       AliHMPIDDigit sdi(stream.GetPadArray()[iPad],stream.GetChargeArray()[iPad]);
730       new((*pSdiLst)[iSdiCnt++]) AliHMPIDDigit(sdi); //add this digit to the tmp list
731     }
732   }
733   
734   GetLoader()->TreeS()->Fill(); GetLoader()->WriteSDigits("OVERWRITE");//write out sdigits
735   SdiReset();
736   return kTRUE;
737 }//Raw2SDigits
738 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
739 void AliHMPIDv2::StepCount()
740 {
741 // Count number of ckovs created  
742 }
743 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
744 void AliHMPIDv2::StepHistory()
745 {
746 // This methode is invoked from StepManager() in order to print out 
747   static Int_t iStepN;
748   const char *sParticle;
749   switch(gMC->TrackPid()){
750     case kProton:      sParticle="PROTON"    ;break;
751     case kNeutron:     sParticle="neutron"   ;break;
752     case kGamma:       sParticle="gamma"     ;break;
753     case 50000050:     sParticle="CKOV"      ;break;
754     case kPi0:         sParticle="Pi0"       ;break;  
755     case kPiPlus:      sParticle="Pi+"       ;break;  
756     case kPiMinus:     sParticle="Pi-"       ;break;  
757     case kElectron:    sParticle="electron"  ;break;  
758     default:           sParticle="not known" ;break;
759   }
760
761   TString flag="fanny combination";
762   if(gMC->IsTrackAlive()) {
763     if(gMC->IsTrackEntering())      flag="enters to";
764     else if(gMC->IsTrackExiting())  flag="exits from";
765     else if(gMC->IsTrackInside())   flag="inside";
766   } else {
767     if(gMC->IsTrackStop())          flag="stopped in";
768   }
769   
770   Int_t vid=0,copy=0;
771   TString path=gMC->CurrentVolName(); path.Prepend("-");path.Prepend(gMC->CurrentVolOffName(1));//current volume and his mother are always there
772   vid=gMC->CurrentVolOffID(2,copy);  if(vid) {path.Prepend("-");path.Prepend(gMC->VolName(vid));}
773   vid=gMC->CurrentVolOffID(3,copy);  if(vid) {path.Prepend("-");path.Prepend(gMC->VolName(vid));}
774  
775   
776   Printf("Step %i: %s (%i) %s %s m=%.6f GeV q=%.1f dEdX=%.4f Etot=%.4f",iStepN,sParticle,gMC->TrackPid(),flag.Data(),path.Data(),gMC->TrackMass(),gMC->TrackCharge(),gMC->Edep()*1e9,gMC->Etot());
777   
778   Double_t gMcTrackPos[3]; gMC->TrackPosition(gMcTrackPos[0],gMcTrackPos[1],gMcTrackPos[2]);
779   Double_t  gMcTrackPosLoc[3]; gMC->Gmtod(gMcTrackPos,gMcTrackPosLoc,1);
780   Printf("gMC Track Position (MARS) x: %5.3lf, y: %5.3lf, z: %5.3lf (r: %5.3lf) ---> (LOC) x: %5.3f, y: %5.3f, z: %5.3f",gMcTrackPos[0],gMcTrackPos[1],gMcTrackPos[2],TMath::Sqrt(gMcTrackPos[0]*gMcTrackPos[0]+gMcTrackPos[1]*gMcTrackPos[1]+gMcTrackPos[2]*gMcTrackPos[2]),gMcTrackPosLoc[0],gMcTrackPosLoc[1],gMcTrackPosLoc[2]);
781   
782
783   
784   Printf("Step %i: tid=%i flags alive=%i disap=%i enter=%i exit=%i inside=%i out=%i stop=%i new=%i",
785                             iStepN, gAlice->GetMCApp()->GetCurrentTrackNumber(),
786                             gMC->IsTrackAlive(), gMC->IsTrackDisappeared(),gMC->IsTrackEntering(), gMC->IsTrackExiting(),
787                             gMC->IsTrackInside(),gMC->IsTrackOut(),        gMC->IsTrackStop(),     gMC->IsNewTrack());
788   
789   Float_t a,z,den,rad,abs; a=z=den=rad=abs=-1;
790   Int_t mid=gMC->CurrentMaterial(a,z,den,rad,abs);
791   Printf("Step %i: mid=%i a=%7.2f z=%7.2f den=%9.4f rad=%9.2f abs=%9.2f\n\n",iStepN,mid,a,z,den,rad,abs);
792   
793   TArrayI proc;  gMC->StepProcesses(proc); 
794   Printf("Processes in this step:");
795   for ( int i = 0 ; i < proc.GetSize(); i++)
796   {
797     Printf("%s",TMCProcessName[proc.At(i)]);
798   }
799   Printf("End process list");
800   
801   iStepN++;
802 }//StepHistory()
803 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
804 void AliHMPIDv2::StepManager()
805 {
806 // Full Step Manager.
807 // Arguments: none
808 //   Returns: none           
809 //  StepHistory(); return; //uncomment to print tracks history
810  //  StepCount(); return;     //uncomment to count photons
811   
812   Int_t   copy; //volume copy aka node
813   
814 //Treat photons    
815   if((gMC->TrackPid()==50000050||gMC->TrackPid()==50000051)&&gMC->CurrentVolID(copy)==fIdPad){   //photon (Ckov or feedback) hit PC (fIdPad)
816     if(gMC->Edep()>0){                                                                           //photon survided QE test i.e. produces electron
817       if(IsLostByFresnel()){ gMC->StopTrack(); return;}                                          //photon lost due to fersnel reflection on PC       
818                        gMC->CurrentVolOffID(5,copy);                                             //current chamber since geomtry tree is Hmp-Hsec-Hgap-Hrow-Hcel-Hpad
819       Int_t   tid=     gMC->GetStack()->GetCurrentTrackNumber();                                 //take TID
820       Int_t   pid=     gMC->TrackPid();                                                          //take PID
821       Float_t etot=    gMC->Etot();                                                              //total hpoton energy, [GeV] 
822       Double_t x[3];   gMC->TrackPosition(x[0],x[1],x[2]);                                       //take MARS position at entrance to PC
823       Float_t xl,yl;   AliHMPIDParam::Instance()->Mars2Lors(copy,x,xl,yl);                       //take LORS position
824       new((*fHits)[fNhits++])AliHMPIDHit(copy,etot,pid,tid,xl,yl,x);                             //HIT for photon, position at P, etot will be set to Q
825       if(fDoFeed) GenFee(etot);                                                                  //generate feedback photons etot is modified in hit ctor to Q of hit
826     }//photon hit PC and DE >0 
827   }//photon hit PC
828   
829 //Treat charged particles  
830   static Float_t eloss;                                                                           //need to store mip parameters between different steps    
831   static Double_t in[3];                                                                          
832   if(gMC->IsTrackEntering() && gMC->TrackCharge() && gMC->CurrentVolID(copy)==fIdPad)             //Trackref stored when entering in the pad volume
833     AddTrackReference(gMC->GetStack()->GetCurrentTrackNumber(), AliTrackReference::kHMPID);       //for acceptance calculations
834   if(gMC->TrackCharge() && gMC->CurrentVolID(copy)==fIdCell){                                     //charged particle in amplification gap (fIdCell)
835     if(gMC->IsTrackEntering()||gMC->IsNewTrack()) {                                               //entering or newly created
836       eloss=0;                                                                                    //reset Eloss collector                         
837       gMC->TrackPosition(in[0],in[1],in[2]);                                                      //take position at the entrance
838     }else if(gMC->IsTrackExiting()||gMC->IsTrackStop()||gMC->IsTrackDisappeared()){               //exiting or disappeared
839       eloss              +=gMC->Edep();                                                           //take into account last step Eloss
840                           gMC->CurrentVolOffID(4,copy);                                           //take current chamber since geometry tree is Hmp-Hsec-Hgap-Hrow-Hcel
841       Int_t tid=          gMC->GetStack()->GetCurrentTrackNumber();                               //take TID
842       Int_t pid=          gMC->TrackPid();                                                        //take PID
843       Double_t out[3];    gMC->TrackPosition(out[0],out[1],out[2]);                               //take MARS position at exit
844       out[0]=0.5*(out[0]+in[0]);                                                                  //>
845       out[1]=0.5*(out[1]+in[1]);                                                                  //take hit position at the anod plane
846       out[2]=0.5*(out[2]+in[2]);                                                                  //>
847       Float_t xl,yl;AliHMPIDParam::Instance()->Mars2Lors(copy,out,xl,yl);                         //take LORS position
848       new((*fHits)[fNhits++])AliHMPIDHit(copy,eloss,pid,tid,xl,yl,out);                           //HIT for MIP, position near anod plane, eloss will be set to Q 
849       if(fDoFeed) GenFee(eloss);                                                                  //generate feedback photons 
850     }else                                                                                         //just going inside
851       eloss          += gMC->Edep();                                                              //collect this step eloss 
852   }//MIP in GAP
853 }//StepManager()
854 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
855 void AliHMPIDv2::TestPoint(Int_t ch,Float_t x,Float_t y)
856 {
857 // Utility method to check the validity of geometry by poviding some crucial points
858 // Arguments: ch,x,y- crucial point definition (cm) in LORS
859 //   Returns: none    
860   Double_t mars[3];
861   AliHMPIDParam::Instance()->Lors2Mars(ch,x,y,mars);
862   Printf("(ch=%i,locX=%.2f,locY=%.2f) %s",ch,x,y,gGeoManager->FindNode(mars[0],mars[1],mars[2])->GetName());
863 }//TestPoint()
864 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
865 void AliHMPIDv2::TestGeom()
866 {
867 //
868 // Test method to check geometry
869 //
870   //TGeoManager::Import("misaligned_geometry.root");
871   TGeoManager::Import("geometry.root");
872   for(Int_t ch=AliHMPIDParam::kMinCh;ch<=AliHMPIDParam::kMaxCh;ch++)
873     TestPoint(ch,0,0);
874 }//TestPoint()
875 //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
876
877 void  AliHMPIDv2::IdealPosition(Int_t iCh,TGeoHMatrix *pMatrix)       //ideal position of given chamber 
878 {
879 // Construct ideal position matrix for a given chamber
880 // Arguments: iCh- chamber ID; pMatrix- pointer to precreated unity matrix where to store the results
881 //   Returns: none
882   const Double_t kAngHor=19.5;        //  horizontal angle between chambers  19.5 grad
883   const Double_t kAngVer=20;          //  vertical angle between chambers    20   grad     
884   const Double_t kAngCom=30;          //  common HMPID rotation with respect to x axis  30   grad     
885   const Double_t kTrans[3]={490,0,0}; //  center of the chamber is on window-gap surface
886   pMatrix->RotateY(90);               //  rotate around y since initial position is in XY plane -> now in YZ plane
887   pMatrix->SetTranslation(kTrans);    //  now plane in YZ is shifted along x 
888   switch(iCh){
889     case 0:                pMatrix->RotateY(kAngHor);  pMatrix->RotateZ(-kAngVer);  break; //right and down 
890     case 1:                                            pMatrix->RotateZ(-kAngVer);  break; //down              
891     case 2:                pMatrix->RotateY(kAngHor);                               break; //right 
892     case 3:                                                                         break; //no rotation
893     case 4:                pMatrix->RotateY(-kAngHor);                              break; //left   
894     case 5:                                            pMatrix->RotateZ(kAngVer);   break; //up
895     case 6:                pMatrix->RotateY(-kAngHor); pMatrix->RotateZ(kAngVer);   break; //left and up 
896   }
897   pMatrix->RotateZ(kAngCom);     //apply common rotation  in XY plane    
898 }