+++ /dev/null
-/**************************************************************************
- * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
- * *
- * Author: The ALICE Off-line Project. *
- * Contributors are mentioned in the code where appropriate. *
- * *
- * Permission to use, copy, modify and distribute this software and its *
- * documentation strictly for non-commercial purposes is hereby granted *
- * without fee, provided that the above copyright notice appears in all *
- * copies and that both the copyright notice and this permission notice *
- * appear in the supporting documentation. The authors make no claims *
- * about the suitability of this software for any purpose. It is *
- * provided "as is" without express or implied warranty. *
- **************************************************************************/
-
-////////////////////////////////////////////////////////////////////////////
-// AliTPCExBBShape class //
-////////////////////////////////////////////////////////////////////////////
-
-#include <AliMagF.h>
-#include "TGeoGlobalMagField.h"
-#include "AliTPCcalibDB.h"
-#include "AliTPCParam.h"
-#include "AliLog.h"
-
-#include "AliTPCExBBShape.h"
-
-AliTPCExBBShape::AliTPCExBBShape()
- : AliTPCCorrection("exb_bshape","ExB B-shape"),
- fC1(0.),fC2(0.),
- fBField(0)
-{
- //
- // default constructor
- //
-}
-
-AliTPCExBBShape::~AliTPCExBBShape() {
- //
- // virtual destructor
- //
-}
-
-void AliTPCExBBShape::Init() {
- //
- // Initialization funtion
- //
-
- AliMagF* magF= (AliMagF*)TGeoGlobalMagField::Instance()->GetField();
- if (!magF) AliError("Magneticd field - not initialized");
- Double_t bzField = magF->SolenoidField()/10.; //field in T
- SetBField(magF);
- AliTPCParam *param= AliTPCcalibDB::Instance()->GetParameters();
- if (!param) AliError("Parameters - not initialized");
- Double_t vdrift = param->GetDriftV()/1000000.; // [cm/us] // From dataBase: to be updated: per second (ideally)
- Double_t ezField = 400; // [V/cm] // to be updated: never (hopefully)
- Double_t wt = -10.0 * (bzField*10) * vdrift / ezField ;
- // Correction Terms for effective omegaTau; obtained by a laser calibration run
- SetOmegaTauT1T2(wt,fT1,fT2);
-
-
-}
-
-void AliTPCExBBShape::Update(const TTimeStamp &/*timeStamp*/) {
- //
- // Update function
- //
- AliMagF* magF= (AliMagF*)TGeoGlobalMagField::Instance()->GetField();
- if (!magF) AliError("Magneticd field - not initialized");
- Double_t bzField = magF->SolenoidField()/10.; //field in T
- SetBField(magF);
- AliTPCParam *param= AliTPCcalibDB::Instance()->GetParameters();
- if (!param) AliError("Parameters - not initialized");
- Double_t vdrift = param->GetDriftV()/1000000.; // [cm/us] // From dataBase: to be updated: per second (ideally)
- Double_t ezField = 400; // [V/cm] // to be updated: never (hopefully)
- Double_t wt = -10.0 * (bzField*10) * vdrift / ezField ;
- // Correction Terms for effective omegaTau; obtained by a laser calibration run
- SetOmegaTauT1T2(wt,fT1,fT2);
-
-
-}
-
-
-
-void AliTPCExBBShape::GetCorrection(const Float_t x[],const Short_t roc,Float_t dx[]) {
- //
- // Calculates the space point corrections of the B field inperfections (B field shape)
- //
-
- if (!fBField) {
- for (Int_t j=0;j<3;++j) dx[j]=0.;
- return;
- }
-
- const Double_t xStart[3]={ x[0], x[1], x[2] };
- const Double_t xEnd[3]={ x[0], x[1], roc%36<18?fgkTPCZ0:-fgkTPCZ0 };
-
- Double_t intBStart[3];
- Double_t intBEnd[3];
-
- fBField->GetTPCRatInt(xStart,intBStart);
- fBField->GetTPCRatInt(xEnd, intBEnd );
-
- const Float_t intBxOverBz=(intBEnd[0]-intBStart[0]);
- const Float_t intByOverBz=(intBEnd[1]-intBStart[1]);
-
- dx[0]=fC2*intBxOverBz-fC1*intByOverBz;
- dx[1]=fC1*intBxOverBz+fC2*intByOverBz;
- dx[2]=0.;
-
-
-}
-
-void AliTPCExBBShape::GetBxAndByOverBz(const Float_t x[],const Short_t roc,Float_t BxByOverBz[]) {
- //
- // This function is purely for calibration purposes
- // Returns the via AliMagF obtaind B field integrals
- //
-
- if (!fBField) {
- for (Int_t j=0;j<3;++j) BxByOverBz[j]=0.;
- return;
- }
-
- const Double_t xStart[3]={ x[0], x[1], x[2] };
- const Double_t xEnd[3]={ x[0], x[1], roc%36<18?fgkTPCZ0:-fgkTPCZ0 };
-
- Double_t intBStart[3];
- Double_t intBEnd[3];
-
- fBField->GetTPCRatInt(xStart,intBStart);
- fBField->GetTPCRatInt(xEnd, intBEnd );
-
- const Float_t intBxOverBz=(intBEnd[0]-intBStart[0]);
- const Float_t intByOverBz=(intBEnd[1]-intBStart[1]);
-
- BxByOverBz[0]=intBxOverBz;
- BxByOverBz[1]=intByOverBz;
-
-}
-
-void AliTPCExBBShape::Print(Option_t* option) const {
- //
- // Print function to check the settings (e.g. voltage offsets)
- // option=="a" prints details of the B field settings and the
- // C0 and C1 coefficents (for calibration purposes)
- //
- TString opt = option; opt.ToLower();
- printf("%s\t%s\n - B field settings:\n",GetTitle(),GetName());
- fBField->Print(option);
- // printf(" - B field: X-Twist: %1.5lf rad, Y-Twist: %1.5lf rad \n",fBField->Print(option));
- if (opt.Contains("a")) { // Print all details
- printf(" - T1: %1.4f, T2: %1.4f \n",fT1,fT2);
- printf(" - C1: %1.4f, C2: %1.4f \n",fC1,fC2);
- }
-}
-
-Double_t AliTPCExBBShape::GetBFieldXYZ(Double_t gx, Double_t gy, Double_t gz, Int_t axisType){
- //
- // return B field at given x,y,z
- //
- AliMagF* field = (AliMagF*)TGeoGlobalMagField::Instance()->GetField();
- if (!field) return 0;
- Double_t xyz[3]={gx,gy,gz};
- Double_t bxyz[3]={0};
- field->Field(xyz,bxyz);
- //
- Double_t r=TMath::Sqrt(gx*gx+gy*gy);
- // Double_t b=TMath::Sqrt(bxyz[0]*bxyz[0]+bxyz[1]*bxyz[1]);
- if (axisType==0) {
- return (xyz[0]*bxyz[1]-xyz[1]*bxyz[0])/(bxyz[2]*r);
- }
- if (axisType==1){
- return (xyz[0]*bxyz[0]+xyz[1]*bxyz[1])/(bxyz[2]*r);
- }
- if (axisType==2) return bxyz[2];
- if (axisType==3) return bxyz[0];
- if (axisType==4) return bxyz[1];
- if (axisType==5) return bxyz[2];
- return bxyz[2];
-}
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