* provided "as is" without express or implied warranty. *
**************************************************************************/
-//////////////////////////////////////////////////////////////////////////////
-// //
-// AliTPCFCVoltError3D class //
-// The class calculates the space point distortions due to residual voltage //
-// errors on the Field Cage boundaries (rods) of the TPC in 3D. //
-// //
-// The class allows "effective Omega Tau" corrections. //
-// //
-// NOTE: This class is capable of calculating z distortions due to //
-// drift velocity changes in dependence of the electric field!!! //
-// //
-// date: 08/08/2010 //
-// Authors: Jim Thomas, Stefan Rossegger //
-// //
-// Example usage : //
-// AliTPCFCVoltError3D fcerror; //
-//////////////////////////////////////////////////////////////////////////////
+// _________________________________________________________________
+//
+// Begin_Html
+// <h2>AliTPCFCVoltError3D class </h2>
+// The class calculates the space point distortions due to residual voltage errors
+// on the Field Cage (FC) boundaries (rods and strips) of the TPC in 3D. It uses
+// the Poisson relaxation technique in three dimension as implemented in the parent class.
+// <p>
+// Although the calculation is performed in 3D, the calculation time was significantly
+// reduced by using certain symmetry conditions within the calculation.
+// <p>
+// The input parameters can be set via the functions (e.g.) SetRodVoltShift(rod,dV) where
+// rod is the number of the rod on which the voltage offset dV is set. The corresponding
+// shift in z direction would be $dz=dV/40$ with an opposite sign for the C side. The
+// rods are numbered in anti-clock-wise direction starting at $\phi=0$. Rods in the IFC
+// are from 0 to 17, rods on the OFC go from 18 to 35. <br>
+// This convention is following the offline numbering scheme of the ROCs.
+// <p>
+// Different misalignment scenarios can be modeled:
+// <ul>
+// <li> A rotated clip scenario is only possible at two positions (Rod 11 at IFC, rod 3(+18) at OFC)
+// and can be set via SetRotatedClipVolt. The key feature is that at the mentioned positions,
+// the strip-ends were combined. At these positions, a systematic offset of one strip-end in
+// respect to the other is possible.
+// <li> A normal rod offset, where the strips follow the movement of the rod, can be set via
+// SetRodVoltShift. It has a anti-mirrored signature in terms of distortions when compared
+// to the rotated clip. This misalignment is possible at each single rod of the FC.
+// <li> A simple rod offset, where the strips do not follow the shift, results in an even more
+// localized distortion close to the rod. The difference to a rod shift, where the strips follow,
+// is more dominant on the OFC. This effect can be set via the function SetCopperRodShift.
+// </ul>
+// End_Html
+//
+// Begin_Macro(source)
+// {
+// gROOT->SetStyle("Plain"); gStyle->SetPalette(1);
+// TCanvas *c2 = new TCanvas("cAliTPCVoltError3D","cAliTPCVoltError3D",500,450);
+// AliTPCFCVoltError3D fc;
+// fc.SetOmegaTauT1T2(0,1,1);
+// fc.SetRotatedClipVoltA(0,40);
+// fc.SetRodVoltShiftA(3,40);
+// fc.SetCopperRodShiftA(7+18,40);
+// fc.SetRodVoltShiftA(15+18,40);
+// fc.CreateHistoDRPhiinXY(10)->Draw("cont4z");
+// return c2;
+// }
+// End_Macro
+//
+// Begin_Html
+// <p>
+// Date: 08/08/2010 <br>
+// Authors: Jim Thomas, Stefan Rossegger
+// End_Html
+// _________________________________________________________________
+
#include "AliMagF.h"
#include "TGeoGlobalMagField.h"
#include "AliTPCParam.h"
#include "AliLog.h"
#include "TMatrixD.h"
+#include "TMatrixF.h"
#include "TMath.h"
#include "AliTPCROC.h"
// it represents a sum up of the 4 basic look up tables (created individually)
// see InitFCVoltError3D() function
for ( Int_t k = 0 ; k < kNPhi ; k++ ) {
- fLookUpErOverEz[k] = new TMatrixD(kNR,kNZ);
- fLookUpEphiOverEz[k] = new TMatrixD(kNR,kNZ);
- fLookUpDeltaEz[k] = new TMatrixD(kNR,kNZ);
+ fLookUpErOverEz[k] = new TMatrixF(kNR,kNZ);
+ fLookUpEphiOverEz[k] = new TMatrixF(kNR,kNZ);
+ fLookUpDeltaEz[k] = new TMatrixF(kNR,kNZ);
}
for ( Int_t k = 0 ; k < kPhiSlices ; k++ ) {
//
// Calculates the correction due e.g. residual voltage errors on the TPC boundaries
//
+ const Double_t kEpsilon=Double_t(FLT_MIN);
if (!fInitLookUp) {
AliInfo("Lookup table was not initialized! Perform the inizialisation now ...");
InitFCVoltError3D();
}
+ static Bool_t forceInit=kTRUE; //temporary needed for back compatibility with old OCDB entries
+ if (forceInit &&fLookUpErOverEz[0]){
+ if (TMath::Abs(fLookUpErOverEz[0]->Sum())<kEpsilon){//temporary needed for back compatibility with old OCDB entries
+ ForceInitFCVoltError3D();
+ }
+ forceInit=kFALSE;
+ }
+
+
Int_t order = 1 ; // FIXME: hardcoded? Linear interpolation = 1, Quadratic = 2
// note that the poisson solution was linearly mirroed on this grid!
- Double_t intEr, intEphi, intDeltaEz;
- Double_t r, phi, z ;
+ Float_t intEr, intEphi, intDeltaEz;
+ Float_t r, phi, z ;
Int_t sign;
r = TMath::Sqrt( x[0]*x[0] + x[1]*x[1] ) ;
for ( Int_t k = 0 ; k < kNPhi ; k++ ) {
phi = fgkPhiList[k] ;
- TMatrixD &erOverEz = *fLookUpErOverEz[k] ;
- TMatrixD &ephiOverEz = *fLookUpEphiOverEz[k];
- TMatrixD &deltaEz = *fLookUpDeltaEz[k] ;
+ TMatrixF &erOverEz = *fLookUpErOverEz[k] ;
+ TMatrixF &ephiOverEz = *fLookUpEphiOverEz[k];
+ TMatrixF &deltaEz = *fLookUpDeltaEz[k] ;
for ( Int_t i = 0 ; i < kNZ ; i++ ) {
z = TMath::Abs(fgkZList[i]) ; // Symmetric solution in Z that depends only on ABS(Z)
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff