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Merged
shahor02 merged 1 commit into from
May 15, 2025
Merged

Implementation of MFT rails inside Cage #14278

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21 changes: 21 additions & 0 deletions Detectors/ITSMFT/ITS/simulation/include/ITSSimulation/V3Cage.h
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Original file line number Diff line number Diff line change
Expand Up @@ -113,6 +113,16 @@ class V3Cage : public V11Geometry
/// \param mgr The GeoManager (used only to get the proper material)
TGeoVolume* createCageClosingCross(const TGeoManager* mgr = gGeoManager);

/// Creates and places the MFT rails inside the Cage
/// \param mother The mother volume to place the rails into
/// \param mgr The GeoManager (used only to get the proper material)
void createAndPlaceMFTRailsInsideCage(TGeoVolume* mother, const TGeoManager* mgr = gGeoManager);

/// Creates a pair of MFT rails inside the Cage
/// \param motmed Medium material of the mother volume
/// \param mgr The GeoManager (used only to get the proper material)
TGeoVolume* createMFTRailsPair(const TGeoMedium* motmed, const TGeoManager* mgr = gGeoManager);

// Parameters
static const Double_t sCageYInBarrel; ///< Global Y translation

Expand Down Expand Up @@ -244,6 +254,17 @@ class V3Cage : public V11Geometry
static const Double_t sCageCrossBarThick; ///< Closing cross bar thickness
static const Double_t sCageCrossBarPhi; ///< Closing cross bar angle

// MFT Rails inside the Cage
static const Double_t sCageMFTRailZLen; ///< Total length of the rail
static const Double_t sCageMFTRailTotWidth; ///< Total width of the rail
static const Double_t sCageMFTRailExtWidth; ///< Width of the external part
static const Double_t sCageMFTRailIntWidth; ///< Width of the internal part
static const Double_t sCageMFTRailBaseWidth; ///< Width of the rail base
static const Double_t sCageMFTRailTotHeight; ///< Total height of the rail
static const Double_t sCageMFTRailExtHeight; ///< Height of the external part
static const Double_t sCageMFTRailIntHeight; ///< Height of the internal part
static const Double_t sCageMFTRailsXDist; ///< X distance between rails

ClassDefOverride(V3Cage, 0); // ITS v3 support geometry
};
} // namespace its
Expand Down
146 changes: 146 additions & 0 deletions Detectors/ITSMFT/ITS/simulation/src/V3Cage.cxx
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Expand Up @@ -167,6 +167,16 @@ const Double_t V3Cage::sCageCrossZLength = 8 * sMm;
const Double_t V3Cage::sCageCrossBarThick = 20 * sMm;
const Double_t V3Cage::sCageCrossBarPhi = 25; // Deg

const Double_t V3Cage::sCageMFTRailZLen = 1807 * sMm;
const Double_t V3Cage::sCageMFTRailTotWidth = 27 * sMm;
const Double_t V3Cage::sCageMFTRailExtWidth = 24 * sMm;
const Double_t V3Cage::sCageMFTRailIntWidth = 17.5 * sMm;
const Double_t V3Cage::sCageMFTRailBaseWidth = 22 * sMm;
const Double_t V3Cage::sCageMFTRailTotHeight = 8.9 * sMm;
const Double_t V3Cage::sCageMFTRailExtHeight = 5.9 * sMm;
const Double_t V3Cage::sCageMFTRailIntHeight = 3.5 * sMm;
const Double_t V3Cage::sCageMFTRailsXDist = 44 * sMm;

ClassImp(V3Cage);

V3Cage::V3Cage()
Expand Down Expand Up @@ -251,6 +261,9 @@ void V3Cage::createAndPlaceCage(TGeoVolume* mother, const TGeoManager* mgr)
zpos = sBPSuppZPos + sBPSuppCollarBeamWid / 2;
mother->AddNode(cageBPSupport, 1, new TGeoTranslation(0, ypos, zpos));

// The MFT Rails inside the Cage
createAndPlaceMFTRailsInsideCage(mother, mgr);

return;
}

Expand Down Expand Up @@ -1648,3 +1661,136 @@ TGeoVolume* V3Cage::createCageClosingCross(const TGeoManager* mgr)
// Finally return the closing cross volume
return closCrossVol;
}

void V3Cage::createAndPlaceMFTRailsInsideCage(TGeoVolume* mother, const TGeoManager* mgr)
{
//
// Creates the MFT Rails located inside the Cage and place them
//
// Input:
// motmat : the material of the mother volume (for the container box)
// mgr : the GeoManager (used only to get the proper material)
//
// Output:
//
// Return:
//
// Created: 10 May 2025 Mario Sitta
//

// Local variables
Double_t rdist, rpos, xpos, ypos, alpha;
Double_t xbox, ybox;

// Create a pair of rails (a BBox container is returned)
TGeoVolume* cageMFTRails = createMFTRailsPair(mother->GetMedium(), mgr);

// Now compute the radial distance and the XY position of the box
xbox = (static_cast<TGeoBBox*>(cageMFTRails->GetShape()))->GetDX();
ybox = (static_cast<TGeoBBox*>(cageMFTRails->GetShape()))->GetDY();

rdist = TMath::Sqrt(sCageCoverRint * sCageCoverRint - xbox * xbox);
rpos = rdist - ybox;

// Finally place the four pairs of rails inside the mother volume
xpos = rpos * TMath::Sin(sCageEndCapCableCutPhi * TMath::DegToRad());
ypos = rpos * TMath::Cos(sCageEndCapCableCutPhi * TMath::DegToRad()) + sCageYInBarrel;

alpha = -sCageEndCapCableCutPhi + 180;
mother->AddNode(cageMFTRails, 1, new TGeoCombiTrans(xpos, ypos, 0, new TGeoRotation("", alpha, 0, 0)));
alpha = sCageEndCapCableCutPhi + 180;
mother->AddNode(cageMFTRails, 2, new TGeoCombiTrans(-xpos, ypos, 0, new TGeoRotation("", alpha, 0, 0)));

ypos = rpos * TMath::Cos(sCageEndCapCableCutPhi * TMath::DegToRad()) - sCageYInBarrel;

alpha = sCageEndCapCableCutPhi;
mother->AddNode(cageMFTRails, 3, new TGeoCombiTrans(xpos, -ypos, 0, new TGeoRotation("", alpha, 0, 0)));
alpha = -sCageEndCapCableCutPhi;
mother->AddNode(cageMFTRails, 4, new TGeoCombiTrans(-xpos, -ypos, 0, new TGeoRotation("", alpha, 0, 0)));

return;
}

TGeoVolume* V3Cage::createMFTRailsPair(const TGeoMedium* motmed, const TGeoManager* mgr)
{
//
// Creates a pair of MFT Rails located inside the Cage (from drawings
// ALI-MFT-DF-0057 and elements therein)
// A box containing a pair of rails is returned (a physical box
// is preferred over an Assembly for better performance)
//
// Input:
// motmat : the material of the mother volume (for the container box)
// mgr : the GeoManager (used only to get the proper material)
//
// Output:
//
// Return:
// A rail pair as a TGeoVolume
//
// Created: 10 May 2025 Mario Sitta
//

// Local variables
const Int_t nv = 16;
Double_t xv[nv], yv[nv];
Double_t deltah, xlen, ylen, zlen;
Double_t xpos, ypos;

// The shape of a single rail: a Xtru
xv[0] = sCageMFTRailBaseWidth / 2;
yv[0] = 0.;
xv[1] = xv[0];
yv[1] = sCageMFTRailTotHeight - sCageMFTRailExtHeight;
xv[2] = sCageMFTRailTotWidth / 2;
yv[2] = yv[1];
xv[3] = xv[2];
yv[3] = sCageMFTRailTotHeight;
xv[4] = sCageMFTRailIntWidth / 2;
yv[4] = yv[3];
deltah = (sCageMFTRailExtHeight - sCageMFTRailIntHeight) / 2;
xv[5] = xv[4];
yv[5] = yv[4] - deltah;
xv[6] = sCageMFTRailExtWidth / 2;
yv[6] = yv[5];
xv[7] = xv[6];
yv[7] = yv[6] - sCageMFTRailIntHeight;

for (Int_t i = 8; i < nv; i++) {
xv[i] = -xv[15 - i];
yv[i] = yv[15 - i];
}

zlen = sCageMFTRailZLen / 2;

TGeoXtru* mftRailSh = new TGeoXtru(2);
mftRailSh->SetName("mftrailshape");
mftRailSh->DefinePolygon(nv, xv, yv);
mftRailSh->DefineSection(0, -zlen);
mftRailSh->DefineSection(1, zlen);

// The air container: a BBox
xlen = 2 * sCageMFTRailTotWidth + sCageMFTRailsXDist;
ylen = sCageMFTRailTotHeight / 2;
zlen = sCageMFTRailZLen / 2;
TGeoBBox* mftRailBoxSh = new TGeoBBox(xlen / 2, ylen, zlen);

// We have the shape: now create the real volume
TGeoMedium* medAl = mgr->GetMedium(Form("%s_ALUMINUM$", GetDetName()));

TGeoVolume* mftRailVol = new TGeoVolume("MFTRailInsideCage", mftRailSh, medAl);
mftRailVol->SetFillColor(kGray);
mftRailVol->SetLineColor(kGray);

TGeoVolume* mftRailBoxVol = new TGeoVolume("MFTRailPairInsideCage", mftRailBoxSh, motmed);

// Put the two rails inside the holding box
// (rail Y origin is on its lower face)
xpos = mftRailBoxSh->GetDX() - 0.5 * sCageMFTRailTotWidth;
ypos = mftRailBoxSh->GetDY();
mftRailBoxVol->AddNode(mftRailVol, 1, new TGeoTranslation(xpos, -ypos, 0));
mftRailBoxVol->AddNode(mftRailVol, 2, new TGeoTranslation(-xpos, -ypos, 0));

// Finally return the rails volume
return mftRailBoxVol;
}