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Barrel geometry: Implementation of MFT rail hinges #14316

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Merged
shahor02 merged 1 commit into from
May 23, 2025
Merged

Barrel geometry: Implementation of MFT rail hinges #14316

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16 changes: 16 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 @@ -123,6 +123,10 @@ class V3Cage : public V11Geometry
/// \param mgr The GeoManager (used only to get the proper material)
TGeoVolume* createMFTRailsPair(const TGeoMedium* motmed, const TGeoManager* mgr = gGeoManager);

/// Creates a hinge holding a pair of MFT rails inside the Cage
/// \param mgr The GeoManager (used only to get the proper material)
TGeoVolume* createMFTRailsHinge(const TGeoManager* mgr = gGeoManager);

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

Expand Down Expand Up @@ -256,6 +260,7 @@ class V3Cage : public V11Geometry

// MFT Rails inside the Cage
static const Double_t sCageMFTRailZLen; ///< Total length of the rail
static const Double_t sCageMFTRailZPos; ///< Rail global Z position
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
Expand All @@ -265,6 +270,17 @@ class V3Cage : public V11Geometry
static const Double_t sCageMFTRailIntHeight; ///< Height of the internal part
static const Double_t sCageMFTRailsXDist; ///< X distance between rails

// MFT Rail hinges
static const Double_t sCageMFTHingeTotWid; ///< Total width of a hinge
static const Double_t sCageMFTHingeIntWid; ///< Width of hinge inner part
static const Double_t sCageMFTHingeHeight; ///< Total height of the rail
static const Double_t sCageMFTHingeIntHei; ///< Height of hinge inner part
static const Double_t sCageMFTHingeTotLen; ///< Total length of a hinge
static const Double_t sCageMFTHingeIntLen; ///< Length of hinge inner part
static const Double_t sCageMFTHingeBulgeWid; ///< Width of a hinge bulge
static const Double_t sCageMFTHingeBulgeHei; ///< Height of a hinge bulge
static const Double_t sCageMFTHingeBulgePos; ///< X position of a hinge bulge

ClassDefOverride(V3Cage, 0); // ITS v3 support geometry
};
} // namespace its
Expand Down
136 changes: 126 additions & 10 deletions Detectors/ITSMFT/ITS/simulation/src/V3Cage.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -167,7 +167,9 @@ 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;
// MFT rails inside Cage
const Double_t V3Cage::sCageMFTRailZLen = 1874 * sMm;
const Double_t V3Cage::sCageMFTRailZPos = 6.3 * sMm;
const Double_t V3Cage::sCageMFTRailTotWidth = 27 * sMm;
const Double_t V3Cage::sCageMFTRailExtWidth = 24 * sMm;
const Double_t V3Cage::sCageMFTRailIntWidth = 17.5 * sMm;
Expand All @@ -177,6 +179,16 @@ const Double_t V3Cage::sCageMFTRailExtHeight = 5.9 * sMm;
const Double_t V3Cage::sCageMFTRailIntHeight = 3.5 * sMm;
const Double_t V3Cage::sCageMFTRailsXDist = 44 * sMm;

const Double_t V3Cage::sCageMFTHingeTotWid = 164 * sMm;
const Double_t V3Cage::sCageMFTHingeIntWid = 141.3 * sMm;
const Double_t V3Cage::sCageMFTHingeHeight = 8 * sMm;
const Double_t V3Cage::sCageMFTHingeIntHei = 6 * sMm;
const Double_t V3Cage::sCageMFTHingeTotLen = 41 * sMm;
const Double_t V3Cage::sCageMFTHingeIntLen = 28 * sMm;
const Double_t V3Cage::sCageMFTHingeBulgeWid = 10 * sMm;
const Double_t V3Cage::sCageMFTHingeBulgeHei = 10 * sMm;
const Double_t V3Cage::sCageMFTHingeBulgePos = 7 * sMm;

ClassImp(V3Cage);

V3Cage::V3Cage()
Expand Down Expand Up @@ -1676,15 +1688,19 @@ void V3Cage::createAndPlaceMFTRailsInsideCage(TGeoVolume* mother, const TGeoMana
// Return:
//
// Created: 10 May 2025 Mario Sitta
// Updated: 20 May 2025 Mario Sitta Hinges added
//

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

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

// Create hinge holding a pair of rails
TGeoVolume* cageMFTRailsHinge = createMFTRailsHinge(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();
Expand All @@ -1694,19 +1710,39 @@ void V3Cage::createAndPlaceMFTRailsInsideCage(TGeoVolume* mother, const TGeoMana

// 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;
yposup = rpos * TMath::Cos(sCageEndCapCableCutPhi * TMath::DegToRad()) + sCageYInBarrel;
yposdw = rpos * TMath::Cos(sCageEndCapCableCutPhi * TMath::DegToRad()) - sCageYInBarrel;
zpos = sCageMFTRailZPos;

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

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

// And the hinges too
xpos = rdist * TMath::Sin(sCageEndCapCableCutPhi * TMath::DegToRad());
yposup = rdist * TMath::Cos(sCageEndCapCableCutPhi * TMath::DegToRad()) + sCageYInBarrel;
yposdw = rdist * TMath::Cos(sCageEndCapCableCutPhi * TMath::DegToRad()) - sCageYInBarrel;
zpos = (static_cast<TGeoBBox*>(cageMFTRails->GetShape()))->GetDZ() + sCageMFTRailZPos;

alpha = sCageEndCapCableCutPhi;
mother->AddNode(cageMFTRailsHinge, 1, new TGeoCombiTrans(xpos, yposup, zpos, new TGeoRotation("", -alpha, 0, 0)));
mother->AddNode(cageMFTRailsHinge, 2, new TGeoCombiTrans(-xpos, yposup, zpos, new TGeoRotation("", alpha, 0, 0)));

mother->AddNode(cageMFTRailsHinge, 3, new TGeoCombiTrans(xpos, -yposdw, zpos, new TGeoRotation("", 180 + alpha, 0, 0)));
mother->AddNode(cageMFTRailsHinge, 4, new TGeoCombiTrans(-xpos, -yposdw, zpos, new TGeoRotation("", 180 - alpha, 0, 0)));

zpos = (static_cast<TGeoBBox*>(cageMFTRails->GetShape()))->GetDZ() - sCageMFTRailZPos;
mother->AddNode(cageMFTRailsHinge, 5, new TGeoCombiTrans(xpos, yposup, -zpos, new TGeoRotation("", 90, 180, -90 + alpha))); // On Z<0 apply 180deg rotation on Y axis
mother->AddNode(cageMFTRailsHinge, 6, new TGeoCombiTrans(-xpos, yposup, -zpos, new TGeoRotation("", 90, 180, -90 - alpha)));

mother->AddNode(cageMFTRailsHinge, 7, new TGeoCombiTrans(xpos, -yposdw, -zpos, new TGeoRotation("", 90, 180, 90 - alpha)));
mother->AddNode(cageMFTRailsHinge, 8, new TGeoCombiTrans(-xpos, -yposdw, -zpos, new TGeoRotation("", 90, 180, 90 + alpha)));

return;
}
Expand All @@ -1720,7 +1756,7 @@ TGeoVolume* V3Cage::createMFTRailsPair(const TGeoMedium* motmed, const TGeoManag
// is preferred over an Assembly for better performance)
//
// Input:
// motmat : the material of the mother volume (for the container box)
// motmed : the medium of the mother volume (for the container box)
// mgr : the GeoManager (used only to get the proper material)
//
// Output:
Expand Down Expand Up @@ -1794,3 +1830,83 @@ TGeoVolume* V3Cage::createMFTRailsPair(const TGeoMedium* motmed, const TGeoManag
// Finally return the rails volume
return mftRailBoxVol;
}

TGeoVolume* V3Cage::createMFTRailsHinge(const TGeoManager* mgr)
{
//
// Creates a hinge holding a pair of MFT Rails to the Cage (from drawing
// ALIMFT-0042 and elements inside CAD files)
//
// Input:
// mgr : the GeoManager (used only to get the proper material)
//
// Output:
//
// Return:
// A rail hinge as a TGeoVolume
//
// Created: 19 May 2025 Mario Sitta
//

// Local variables
const Int_t nv = 6;
Double_t xv[nv], yv[nv];
Double_t xlen, ylen, zlen;
Double_t xpos, ypos, zpos;

TString compoShape;

// The main body: a Xtru
xv[0] = sCageMFTHingeTotWid / 2;
yv[0] = 0;
xv[1] = xv[0];
yv[1] = sCageMFTHingeIntHei;
xv[2] = sCageMFTHingeIntWid / 2;
yv[2] = sCageMFTHingeHeight;

for (Int_t i = 3; i < nv; i++) {
xv[i] = -xv[5 - i];
yv[i] = yv[5 - i];
}

zlen = sCageMFTHingeIntLen / 2;

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

// The bulge: a BBox
xlen = sCageMFTHingeBulgeWid / 2;
ylen = sCageMFTHingeBulgeHei / 2;
zlen = (sCageMFTHingeTotLen - sCageMFTHingeIntLen) / 2;
TGeoBBox* mftHingeBulgeSh = new TGeoBBox("mfthingebulgeshape", xlen, ylen, zlen);

// The actual hinge: a CompositeShape
xpos = mftHingeBodySh->GetX(0) - (sCageMFTHingeBulgePos + mftHingeBulgeSh->GetDX());
ypos = mftHingeBodySh->GetY(2) - mftHingeBulgeSh->GetDY();
zpos = mftHingeBodySh->GetZ(1) + mftHingeBulgeSh->GetDZ();

TGeoTranslation* bulgpos1 = new TGeoTranslation(xpos, ypos, zpos);
bulgpos1->SetName("bulge1pos");
bulgpos1->RegisterYourself();

TGeoTranslation* bulgpos2 = new TGeoTranslation(-xpos, ypos, zpos);
bulgpos2->SetName("bulge2pos");
bulgpos2->RegisterYourself();

compoShape = Form("mfthingebodyshape+mfthingebulgeshape:bulge1pos+mfthingebulgeshape:bulge2pos");

TGeoCompositeShape* mftRailHingeSh = new TGeoCompositeShape(compoShape);

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

TGeoVolume* mftRailHingeVol = new TGeoVolume("MFTRailHingeInsideCage", mftRailHingeSh, medAl);
mftRailHingeVol->SetFillColor(kGreen);
mftRailHingeVol->SetLineColor(kGreen);

// Finally return the hinge volume
return mftRailHingeVol;
}