* about the suitability of this software for any purpose. It is *
* provided "as is" without express or implied warranty. *
**************************************************************************/
-
/* $Id$ */
-
+/** @file AliFMD3.cxx
+ @author Christian Holm Christensen <cholm@nbi.dk>
+ @date Sun Mar 26 18:26:12 2006
+ @brief Concrete implementation of AliFMDDetector for FMD3
+*/
//____________________________________________________________________
//
-// Concrete implementation of AliFMDSubDetector
+// Concrete implementation of AliFMDDetector
//
-// This implements the geometry for FMD3
+// This implements the geometry for FMD3.
+// This has 2 rings.
+// The support of the FMD3 is a carbon-fibre cone, attached to the ITS
+// support via flanges. The cone also supports the beam-pipe.
+// The support is a special cone of carbon-fibre made by a Danish
+// Yacht company.
//
-#ifndef ROOT_TVirtualMC
-# include <TVirtualMC.h>
-#endif
-#ifndef ROOT_TCONS
-# include <TCONS.h>
-#endif
-#ifndef ROOT_TNode
-# include <TNode.h>
-#endif
-#ifndef ROOT_TList
-# include <TList.h>
-#endif
-#ifndef ALIFMD3_H
-# include "AliFMD3.h"
-#endif
-#ifndef ALILOG_H
-# include "AliLog.h"
-#endif
-#ifndef ALIFMDRING_H
-# include "AliFMDRing.h"
-#endif
-#include <iostream>
-//____________________________________________________________________
-ClassImp(AliFMD3);
-
-//____________________________________________________________________
-AliFMD3::AliFMD3()
- : AliFMDSubDetector(3),
- fVolumeId(0),
- fDz(0)
-{
- // Default constructor for the FMD3 sub-detector
-}
+#include <TMath.h> // ROOT_TMath
+#include "AliFMD3.h" // ALIFMD3_H
+#include "AliLog.h" // ALILOG_H
+#include "AliFMDRing.h" // ALIFMDRING_H
-//____________________________________________________________________
-AliFMD3::~AliFMD3()
-{
- // Destructor - does nothing
-}
-
+//====================================================================
+ClassImp(AliFMD3)
+#if 0
+ ; // This is here to keep Emacs for indenting the next line
+#endif
//____________________________________________________________________
-void
-AliFMD3::SetupGeometry(Int_t airId, Int_t kaptionId)
+AliFMD3::AliFMD3(AliFMDRing* inner, AliFMDRing* outer)
+ : AliFMDDetector(3, inner, outer),
+ fNoseZ(0),
+ fNoseLowR(0),
+ fNoseHighR(0),
+ fNoseLength(0),
+ fBackLowR(0),
+ fBackHighR(0),
+ fBackLength(0),
+ fBeamThickness(0),
+ fBeamWidth(0),
+ fConeLength(0),
+ fFlangeR(0),
+ fZ(0),
+ fAlpha(0),
+ fNBeam(0),
+ fNFlange(0)
{
- // Setup the FMD3 sub-detector geometry
- //
- // Parameters:
- //
- // airId Id # of the Air medium
- // kaptionId Id # of the Aluminium medium
- //
- fInnerHoneyLowR = fInner->GetLowR() + 1;
- fInnerHoneyHighR = fInner->GetHighR() + 1;
- fOuterHoneyLowR = fOuter->GetLowR() + 1;
- fOuterHoneyHighR = fOuter->GetHighR() + 1;
-
- CalculateDz();
- Double_t par[3];
- par[0] = fInner->GetLowR();
- par[1] = fOuterHoneyHighR;
- par[2] = fDz;
- fVolumeId = gMC->Gsvolu("FMD3", "TUBE", airId, par, 3);
-
- gMC->Matrix(fRotationId, 90, 0, 90, 90, 0, 0);
- //0, 180, 90, 90, 180, 0);
-
- AliFMDSubDetector::SetupGeometry(airId, kaptionId);
+ // Constructor.
+ SetInnerZ(-62.8);
+ SetOuterZ(-75.2);
+ SetNoseZ();
+ SetNoseLowR();
+ SetNoseHighR();
+ SetNoseLength();
+ SetBackLowR();
+ SetBackHighR();
+ SetBackLength();
+ SetBeamThickness();
+ SetBeamWidth();
+ SetConeLength();
+ SetFlangeR();
+ SetNBeam();
+ SetNFlange();
}
//____________________________________________________________________
-void
-AliFMD3::Geometry(const char* mother, Int_t pbRotId,
- Int_t idRotId, Double_t z)
+void
+AliFMD3::Init()
{
- // Position the FMD3 sub-detector volume
- //
- // Parameters
- //
- // mother name of the mother volume
- // pbRotId Printboard roation matrix ID
- // idRotId Identity rotation matrix ID
- // z Z position (not really used here, but passed down)
- //
- z = fInnerZ - fDz;
- gMC->Gspos("FMD3", 1, mother, 0, 0, z, fRotationId);
-
- AliFMDSubDetector::Geometry("FMD3", pbRotId, idRotId, z);
+ // Initialize
+ AliFMDDetector::Init();
+ SetInnerHoneyHighR(GetOuterHoneyHighR());
+ Double_t zdist = fConeLength - fBackLength - fNoseLength;
+ Double_t tdist = fBackHighR - fNoseHighR;
+ Double_t innerZh = fInnerZ - fInner->GetRingDepth() - fHoneycombThickness;
+ Double_t outerZh = fOuterZ - fOuter->GetRingDepth() - fHoneycombThickness;
+ Double_t minZ = TMath::Min(fNoseZ - fConeLength, outerZh);
+ fAlpha = tdist / zdist;
+ fZ = fNoseZ + (minZ - fNoseZ) / 2;
+ fInnerHoneyHighR = ConeR(innerZh + fHoneycombThickness,"O") - 1;
+ fOuterHoneyHighR = GetBackLowR();
}
-
//____________________________________________________________________
-void
-AliFMD3::SimpleGeometry(TList* nodes,
- TNode* mother,
- Int_t colour,
- Double_t zMother)
+Double_t
+AliFMD3::ConeR(Double_t z, Option_t* opt) const
{
- // We need to get the equation for the line that connects the
- // outer circumfrences of the two rings, as well as for the line
- // that connects the inner curcumfrences, so that we can project to
- // where the honey-comb actually ends.
- //
- // we have
- //
- // y = a * x + b
- // b = y - a * x;
- //
- // For the outer line, we have the two equations
- //
- // fOuterHoneyHighR = a * x1 + b;
- // fInnerHoneyHighR = a * x2 + b;
- //
- // where
- //
- // x1 = (fOuterZ + fOuter->fSiThickness + fOuter->fPrintboardThickness
- // + fOuter->fLegLength + fModuleSpacing)
- // = fInner - fDz + fHoneycombThickness
- // x2 = (fInnerZ + fInner->fSiThickness + fInner->fPrintboardThickness
- // + fInner->fLegLength + fModuleSpacing)
- //
- // and
- //
- // a = (fOuterHoneyHighR - fInnerHoneyHighR) / (x1 - x2)
- //
- //
- CalculateDz();
-#if 1
- Double_t x1 = (fOuterZ - (fOuter->GetSiThickness()
- + fOuter->GetPrintboardThickness()
- + fOuter->GetLegLength()
- + fOuter->GetModuleSpacing()));
- Double_t x2 = (fInnerZ - (fInner->GetSiThickness()
- + fInner->GetPrintboardThickness()
- + fInner->GetLegLength()
- + fInner->GetModuleSpacing()));
- Double_t ao = 0;
- Double_t ao1 = (fOuterHoneyHighR - fInnerHoneyHighR) / (x1 - x2);
- Double_t ao2 = ((fOuter->GetHighR() - fInner->GetHighR())
- / (fOuterZ - fInnerZ));
- Double_t bo = 0;
- if (ao2 > ao1) {
- std::cout << "Wafer determinds the size" << std::endl;
- ao = ao2;
- bo = fInner->GetHighR() - ao * fInnerZ;
+ // Calculate the cone radius at Z
+ if (fAlpha < 0) {
+ AliWarning(Form("alpha not set: %lf", fAlpha));
+ return -1;
}
- else {
- ao = ao1;
- bo = fOuterHoneyHighR - ao * x1;
+ if (z > fNoseZ) {
+ AliWarning(Form("z=%lf is before start of cone %lf", z, fNoseZ));
+ return -1;
}
-
- Double_t y1o = ao * (fInnerZ - 2 * fDz) + bo;
- Double_t y2o = ao * fInnerZ + bo;
-#endif
- // We probably need to make a PCON here.
- TShape* shape = new TCONS("FMD3", "FMD3", "", fDz,
- fOuter->GetLowR(), y1o, /* fOuterHoneyHighR, */
- fInner->GetLowR(), y2o, /* fInnerHoneyHighR, */
- 0, 360);
- mother->cd();
- zMother = fInnerZ - fDz;
- TNode* node = new TNode("FMD3", "FMD3", shape, 0, 0, zMother, 0);
- node->SetVisibility(0);
- nodes->Add(node);
- AliFMDSubDetector::SimpleGeometry(nodes, node, colour, zMother);
+ if (z < fOuterZ - fOuter->GetRingDepth() - fHoneycombThickness) {
+ AliWarning(Form("z=%lf is after end of cone %lf", z,
+ fOuterZ - fOuter->GetRingDepth() - fHoneycombThickness));
+ return -1;
+ }
+ Double_t e = fBeamThickness / TMath::Cos(TMath::ATan(fAlpha));
+ if (opt[0] == 'I' || opt[1] == 'i') e *= -1;
+ if (z > fNoseZ - fNoseLength) return fNoseHighR + e;
+ if (z < fNoseZ - fConeLength + fBackLength) return fBackHighR + e;
+ Double_t r = fNoseHighR + fAlpha * TMath::Abs(z - fNoseZ + fNoseLength) + e;
+ return r;
}
-//____________________________________________________________________
-void
-AliFMD3::CalculateDz()
-{
- if (fDz > 0) return;
- fDz = (TMath::Abs(fInnerZ - fOuterZ)
- + fOuter->GetSiThickness()
- + fOuter->GetPrintboardThickness()
- + fOuter->GetLegLength()
- + fOuter->GetModuleSpacing()
- + fHoneycombThickness) / 2;
-}
//____________________________________________________________________
//
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff