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Merged
fprino merged 2 commits into from
Nov 12, 2025
Merged

Improved description of IB FPC capacitors #14805

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c606a44
Improved description of IB FPC capacitors
mario6829 Nov 10, 2025
186ad2d
Fix clang format
mario6829 Nov 10, 2025
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80 changes: 43 additions & 37 deletions Detectors/ITSMFT/ITS/simulation/include/ITSSimulation/V3Layer.h
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Expand Up @@ -353,43 +353,49 @@ class V3Layer : public V11Geometry
static const Int_t sIBNChipRows; ///< IB chip rows in module
static const Double_t sIBChipZGap; ///< Gap between IB chips on Z

static const Double_t sIBModuleZLength; ///< IB Module Length along Z
static const Double_t sIBFPCWiderXPlus; ///< FPC protrusion at X>0
static const Double_t sIBFPCWiderXNeg; ///< FPC protrusion at X<0
static const Double_t sIBFlexCableAlThick; ///< Thickness of FPC Aluminum
static const Double_t sIBFPCAlGNDWidth; ///< Width of total FPC Al Gnd
static const Double_t sIBFPCAlAnodeWidth1; ///< Width of FPC Al Anode
static const Double_t sIBFPCAlAnodeWidth2; ///< Width of FPC Al Anode
static const Double_t sIBFlexCableKapThick; ///< Thickness of FPC Kapton
static const Double_t sIBFlexCablePolyThick; ///< Thickness of FPC Coverlay
static const Double_t sIBFlexCapacitorXWid; ///< IB capaictor X width
static const Double_t sIBFlexCapacitorYHi; ///< IB capaictor Y height
static const Double_t sIBFlexCapacitorZLen; ///< IB capaictor Z length
static const Double_t sIBColdPlateWidth; ///< IB cold plate X width
static const Double_t sIBColdPlateZLen; ///< IB cold plate Z length
static const Double_t sIBGlueThick; ///< IB glue thickness
static const Double_t sIBCarbonFleeceThick; ///< IB carbon fleece thickness
static const Double_t sIBCarbonPaperThick; ///< IB Carbon Paper Thickness
static const Double_t sIBCarbonPaperWidth; ///< IB Carbon Paper X Width
static const Double_t sIBCarbonPaperZLen; ///< IB Carbon Paper Z Length
static const Double_t sIBK13D2UThick; ///< IB k13d2u prepreg thickness
static const Double_t sIBCoolPipeInnerD; ///< IB cooling inner diameter
static const Double_t sIBCoolPipeThick; ///< IB cooling pipe thickness
static const Double_t sIBCoolPipeXDist; ///< IB cooling pipe separation
static const Double_t sIBCoolPipeZLen; ///< IB cooling pipe length
static const Double_t sIBTopVertexWidth1; ///< IB TopVertex width
static const Double_t sIBTopVertexWidth2; ///< IB TopVertex width
static const Double_t sIBTopVertexHeight; ///< IB TopVertex height
static const Double_t sIBTopVertexAngle; ///< IB TopVertex aperture angle
static const Double_t sIBSideVertexWidth; ///< IB SideVertex width
static const Double_t sIBSideVertexHeight; ///< IB SideVertex height
static const Double_t sIBTopFilamentSide; ///< IB TopFilament side
static const Double_t sIBTopFilamentAlpha; ///< IB TopFilament angle
static const Double_t sIBTopFilamentInterZ; ///< IB TopFilament Z interdist
static const Double_t sIBEndSupportThick; ///< IB end support thickness
static const Double_t sIBEndSupportZLen; ///< IB end support length
static const Double_t sIBEndSupportXUp; ///< IB end support X up wide
static const Double_t sIBEndSupportOpenPhi; ///< IB end support opening phi
static const Double_t sIBModuleZLength; ///< IB Module Length along Z
static const Double_t sIBFPCWiderXPlus; ///< FPC protrusion at X>0
static const Double_t sIBFPCWiderXNeg; ///< FPC protrusion at X<0
static const Double_t sIBFlexCableAlThick; ///< Thickness of FPC Aluminum
static const Double_t sIBFPCAlGNDWidth; ///< Width of total FPC Al Gnd
static const Double_t sIBFPCAlAnodeWidth1; ///< Width of FPC Al Anode
static const Double_t sIBFPCAlAnodeWidth2; ///< Width of FPC Al Anode
static const Double_t sIBFlexCableKapThick; ///< Thickness of FPC Kapton
static const Double_t sIBFlexCablePolyThick; ///< Thickness of FPC Coverlay
static const Double_t sIBFlexCapacitor1XWid; ///< IB small capacitor X width
static const Double_t sIBFlexCapacitor1YHi; ///< IB small capacitor Y height
static const Double_t sIBFlexCapacitor1ZLen; ///< IB small capacitor Z length
static const Double_t sIBFlexCapacitor22XWid; ///< IB large capacitor X width
static const Double_t sIBFlexCapacitor22YHi; ///< IB large capacitor Y height
static const Double_t sIBFlexCapacitor22ZLen; ///< IB large capacitor Z length
static const Double_t sIBFlexResistorXWid; ///< IB FPC resistor X width
static const Double_t sIBFlexResistorYHi; ///< IB FPC resistor Y height
static const Double_t sIBFlexResistorZLen; ///< IB FPC resistor Z length
static const Double_t sIBColdPlateWidth; ///< IB cold plate X width
static const Double_t sIBColdPlateZLen; ///< IB cold plate Z length
static const Double_t sIBGlueThick; ///< IB glue thickness
static const Double_t sIBCarbonFleeceThick; ///< IB carbon fleece thickness
static const Double_t sIBCarbonPaperThick; ///< IB Carbon Paper Thickness
static const Double_t sIBCarbonPaperWidth; ///< IB Carbon Paper X Width
static const Double_t sIBCarbonPaperZLen; ///< IB Carbon Paper Z Length
static const Double_t sIBK13D2UThick; ///< IB k13d2u prepreg thickness
static const Double_t sIBCoolPipeInnerD; ///< IB cooling inner diameter
static const Double_t sIBCoolPipeThick; ///< IB cooling pipe thickness
static const Double_t sIBCoolPipeXDist; ///< IB cooling pipe separation
static const Double_t sIBCoolPipeZLen; ///< IB cooling pipe length
static const Double_t sIBTopVertexWidth1; ///< IB TopVertex width
static const Double_t sIBTopVertexWidth2; ///< IB TopVertex width
static const Double_t sIBTopVertexHeight; ///< IB TopVertex height
static const Double_t sIBTopVertexAngle; ///< IB TopVertex aperture angle
static const Double_t sIBSideVertexWidth; ///< IB SideVertex width
static const Double_t sIBSideVertexHeight; ///< IB SideVertex height
static const Double_t sIBTopFilamentSide; ///< IB TopFilament side
static const Double_t sIBTopFilamentAlpha; ///< IB TopFilament angle
static const Double_t sIBTopFilamentInterZ; ///< IB TopFilament Z interdist
static const Double_t sIBEndSupportThick; ///< IB end support thickness
static const Double_t sIBEndSupportZLen; ///< IB end support length
static const Double_t sIBEndSupportXUp; ///< IB end support X up wide
static const Double_t sIBEndSupportOpenPhi; ///< IB end support opening phi

static const Double_t sIBConnectorXWidth; ///< IB Connectors Width
static const Double_t sIBConnectorYTot; ///< IB Connectors total height
Expand Down
3 changes: 2 additions & 1 deletion Detectors/ITSMFT/ITS/simulation/src/Detector.cxx
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Expand Up @@ -477,10 +477,11 @@ void Detector::createMaterials()
Float_t dInox304 = 7.85;

// Ceramic (for IB capacitors) (BaTiO3)
// Density includes soldering
Float_t aCeramic[3] = {137.327, 47.867, 15.999};
Float_t zCeramic[3] = {56, 22, 8}; // Ba, Ti, O
Float_t wCeramic[3] = {1, 1, 3}; // Molecular composition
Float_t dCeramic = 6.02;
Float_t dCeramic = 8.28;

// Rohacell (C9 H13 N1 O2)
Float_t aRohac[4] = {12.01, 1.01, 14.010, 16.};
Expand Down
90 changes: 63 additions & 27 deletions Detectors/ITSMFT/ITS/simulation/src/V3Layer.cxx
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Expand Up @@ -61,9 +61,15 @@ const Double_t V3Layer::sIBFPCAlAnodeWidth1 = 13.0 * sMm;
const Double_t V3Layer::sIBFPCAlAnodeWidth2 = 14.7 * sMm;
const Double_t V3Layer::sIBFlexCableKapThick = 75.0 * sMicron;
const Double_t V3Layer::sIBFlexCablePolyThick = 20.0 * sMicron;
const Double_t V3Layer::sIBFlexCapacitorXWid = 0.2 * sMm;
const Double_t V3Layer::sIBFlexCapacitorYHi = 0.2 * sMm;
const Double_t V3Layer::sIBFlexCapacitorZLen = 0.4 * sMm;
const Double_t V3Layer::sIBFlexCapacitor1XWid = 0.5 * sMm;
const Double_t V3Layer::sIBFlexCapacitor1YHi = 0.5 * sMm;
const Double_t V3Layer::sIBFlexCapacitor1ZLen = 1.0 * sMm;
const Double_t V3Layer::sIBFlexCapacitor22XWid = 0.7 * sMm;
const Double_t V3Layer::sIBFlexCapacitor22YHi = 0.6 * sMm;
const Double_t V3Layer::sIBFlexCapacitor22ZLen = 1.1 * sMm;
const Double_t V3Layer::sIBFlexResistorXWid = 0.2 * sMm;
const Double_t V3Layer::sIBFlexResistorYHi = 0.2 * sMm;
const Double_t V3Layer::sIBFlexResistorZLen = 0.4 * sMm;
const Double_t V3Layer::sIBColdPlateWidth = 15.4 * sMm;
const Double_t V3Layer::sIBColdPlateZLen = 290.0 * sMm;
const Double_t V3Layer::sIBGlueThick = 50.0 * sMicron;
Expand Down Expand Up @@ -599,8 +605,11 @@ TGeoVolume* V3Layer::createModuleInnerB(const Double_t xchip, const Double_t zch
// the module as a TGeoVolume
//
// Updated: 03 Apr 2021
// Updated: 03 Nov 2025 Change volume from BBox to Xtru to avoid fake overlaps

Double_t xtot, ytot, ztot;
Double_t ymid, shrinkFactor = 0.73;
Double_t xv[5], yv[5];
Double_t xpos, ypos, zpos;
const Int_t nameLen = 30;
char volumeName[nameLen];
Expand All @@ -619,9 +628,25 @@ TGeoVolume* V3Layer::createModuleInnerB(const Double_t xchip, const Double_t zch
Double_t ygnd = (static_cast<TGeoBBox*>(aluGndCableVol->GetShape()))->GetDY();
Double_t yano = (static_cast<TGeoBBox*>(aluAnodeCableVol->GetShape()))->GetDY();

ytot = sIBGlueThick / 2 + ygnd + sIBFlexCableKapThick / 2 + yano + sIBFlexCapacitorYHi / 2;
ytot = sIBGlueThick / 2 + ygnd + sIBFlexCableKapThick / 2 + yano + sIBFlexCapacitor22YHi / 2;
ymid = sIBGlueThick / 2 + ygnd + sIBFlexCableKapThick / 2 + yano;

TGeoBBox* module = new TGeoBBox(xtot, ytot, ztot);
xv[0] = xtot;
yv[0] = -ytot;
xv[1] = xv[0];
yv[1] = yv[0] + 6 * ymid;
xv[2] = xtot * shrinkFactor;
yv[2] = ytot;
xv[3] = -xtot;
yv[3] = yv[2];
xv[4] = xv[3];
yv[4] = yv[0];

TGeoXtru* module = new TGeoXtru(2);
module->DefinePolygon(6, xv, yv);
module->DefinePolygon(5, xv, yv);
module->DefineSection(0, -ztot);
module->DefineSection(1, ztot);

// Now the volumes
TGeoMedium* medAir = mgr->GetMedium(Form("%s_AIR$", GetDetName()));
Expand Down Expand Up @@ -674,6 +699,7 @@ void V3Layer::createIBCapacitors(TGeoVolume* modvol, Double_t zchip, Double_t yz
//
// Created: 13 Feb 2018 Mario Sitta
// Updated: 03 Apr 2019 Mario Sitta Fix positions (180' rotation)
// Updated: 31 Oct 2025 Mario Sitta Fix dimensions and weight
//

// Position of the various capacitors (A.Junique private communication
Expand Down Expand Up @@ -705,63 +731,72 @@ void V3Layer::createIBCapacitors(TGeoVolume* modvol, Double_t zchip, Double_t yz
Double_t xpos, ypos, zpos;
Int_t nCapacitors;

TGeoVolume *capacitor, *resistor;
TGeoVolume *capacitorSmall, *capacitorLarge, *resistor;

// Check whether we already have the volume, otherwise create it
// (so as to avoid creating multiple copies of the very same volume
// Check whether we already have the volumes, otherwise create them
// (so as to avoid creating multiple copies of the very same volumes
// for each layer)
capacitor = mgr->GetVolume("IBFPCCapacitor");
// The "small" capacitor is the 1 uF substrate capacitor
// The "large" capacitor is the 22 uF analog/digital PS capacitor
capacitorSmall = mgr->GetVolume("IBFPCCapacitorSmall");

if (!capacitor) {
TGeoBBox* capsh = new TGeoBBox(sIBFlexCapacitorXWid / 2, sIBFlexCapacitorYHi / 2, sIBFlexCapacitorZLen / 2);
if (!capacitorSmall) {
TGeoBBox* capSmsh = new TGeoBBox(sIBFlexCapacitor1XWid / 2, sIBFlexCapacitor1YHi / 2, sIBFlexCapacitor1ZLen / 2);
TGeoBBox* capLgsh = new TGeoBBox(sIBFlexCapacitor22XWid / 2, sIBFlexCapacitor22YHi / 2, sIBFlexCapacitor22ZLen / 2);

TGeoMedium* medCeramic = mgr->GetMedium(Form("%s_CERAMIC$", GetDetName()));

capacitor = new TGeoVolume("IBFPCCapacitor", capsh, medCeramic);
capacitor->SetLineColor(kBlack);
capacitor->SetFillColor(kBlack);
capacitorSmall = new TGeoVolume("IBFPCCapacitorSmall", capSmsh, medCeramic);
capacitorSmall->SetLineColor(kBlack);
capacitorSmall->SetFillColor(kBlack);

capacitorLarge = new TGeoVolume("IBFPCCapacitorLarge", capLgsh, medCeramic);
capacitorLarge->SetLineColor(kBlack);
capacitorLarge->SetFillColor(kBlack);

TGeoBBox* ressh = new TGeoBBox(sIBFlexCapacitorXWid / 2, // Resistors have
sIBFlexCapacitorYHi / 2, // the same dim's
sIBFlexCapacitorZLen / 2); // as capacitors
TGeoBBox* ressh = new TGeoBBox(sIBFlexResistorXWid / 2,
sIBFlexResistorYHi / 2,
sIBFlexResistorZLen / 2);

resistor = new TGeoVolume("IBFPCResistor", ressh, medCeramic);
resistor->SetLineColor(kBlack);
resistor->SetFillColor(kBlack);
} else { // Volumes already defined, get them
capacitorLarge = mgr->GetVolume("IBFPCCapacitorLarge");
resistor = mgr->GetVolume("IBFPCResistor");
}

// Place all the capacitors (they are really a lot...)
ypos = yzero + sIBFlexCapacitorYHi / 2;
ypos = yzero + sIBFlexCapacitor22YHi / 2;

xpos = xGroup1A;
for (Int_t j = 0; j < sIBChipsPerRow; j++) {
zpos = -mIBModuleZLength / 2 + j * (2 * zchip + sIBChipZGap) + zchip + zGroup1A[0];
modvol->AddNode(capacitor, 2 * j + 1, new TGeoTranslation(-xpos, ypos, -zpos));
modvol->AddNode(capacitorLarge, 2 * j + 1, new TGeoTranslation(-xpos, ypos, -zpos));
zpos = -mIBModuleZLength / 2 + j * (2 * zchip + sIBChipZGap) + zchip + zGroup1A[1];
modvol->AddNode(capacitor, 2 * j + 2, new TGeoTranslation(-xpos, ypos, -zpos));
modvol->AddNode(capacitorLarge, 2 * j + 2, new TGeoTranslation(-xpos, ypos, -zpos));
}

nCapacitors = 2 * sIBChipsPerRow;
xpos = xGroup1B;
for (Int_t j = 0; j < sIBChipsPerRow; j++) {
zpos = -mIBModuleZLength / 2 + j * (2 * zchip + sIBChipZGap) + zchip + zGroup1B;
modvol->AddNode(capacitor, j + 1 + nCapacitors, new TGeoTranslation(-xpos, ypos, -zpos));
modvol->AddNode(capacitorLarge, j + 1 + nCapacitors, new TGeoTranslation(-xpos, ypos, -zpos));
}

nCapacitors += sIBChipsPerRow;
ypos = yzero + sIBFlexCapacitor1YHi / 2;
xpos = xGroup2;
// We have only 8 in these group, missing the central one
for (Int_t j = 0; j < sIBChipsPerRow - 1; j++) {
zpos = -mIBModuleZLength / 2 + j * (2 * zchip + sIBChipZGap) + zchip + zGroup2;
modvol->AddNode(capacitor, j + 1 + nCapacitors, new TGeoTranslation(-xpos, ypos, -zpos));
modvol->AddNode(capacitorSmall, j + 1 + nCapacitors, new TGeoTranslation(-xpos, ypos, -zpos));
}

nCapacitors += (sIBChipsPerRow - 1);
xpos = xGroup3;
zpos = zGroup3;
modvol->AddNode(capacitor, 1 + nCapacitors, new TGeoTranslation(-xpos, ypos, -zpos));
modvol->AddNode(capacitorSmall, 1 + nCapacitors, new TGeoTranslation(-xpos, ypos, -zpos));

nCapacitors++;
for (Int_t j = 0; j < sIBChipsPerRow; j++) {
Expand All @@ -771,25 +806,26 @@ void V3Layer::createIBCapacitors(TGeoVolume* modvol, Double_t zchip, Double_t yz
xpos = xGroup4[0];
}
zpos = -mIBModuleZLength / 2 + j * (2 * zchip + sIBChipZGap) + zchip + zGroup4[j];
modvol->AddNode(capacitor, j + 1 + nCapacitors, new TGeoTranslation(-xpos, ypos, -zpos));
modvol->AddNode(capacitorSmall, j + 1 + nCapacitors, new TGeoTranslation(-xpos, ypos, -zpos));
}

nCapacitors += sIBChipsPerRow;
ypos = yzero + sIBFlexCapacitor22YHi / 2;
for (Int_t j = 0; j < nGroup5A; j++) {
if (j == 0) {
xpos = xGroup5A[0];
} else {
xpos = xGroup5A[1];
}
zpos = zGroup5A[j];
modvol->AddNode(capacitor, j + 1 + nCapacitors, new TGeoTranslation(-xpos, ypos, -zpos));
modvol->AddNode(capacitorLarge, j + 1 + nCapacitors, new TGeoTranslation(-xpos, ypos, -zpos));
}

nCapacitors += nGroup5A;
xpos = xGroup5B;
for (Int_t j = 0; j < nGroup5B; j++) {
zpos = zGroup5B[j];
modvol->AddNode(capacitor, j + 1 + nCapacitors, new TGeoTranslation(-xpos, ypos, -zpos));
modvol->AddNode(capacitorLarge, j + 1 + nCapacitors, new TGeoTranslation(-xpos, ypos, -zpos));
}

// Place the resistors
Expand Down Expand Up @@ -1061,7 +1097,7 @@ TGeoVolume* V3Layer::createStaveModelInnerB4(const TGeoManager* mgr)
yv[1] = layerHeight + sIBSideVertexHeight + topfil->GetDZ();
;
xv[2] = sIBEndSupportXUp / 2;
yv[2] = sIBStaveHeight + sIBTopFilamentSide / sinD(-theta); // theta is neg
yv[2] = sIBStaveHeight + sIBTopFilamentSide / sinD(-theta) - 0.01; // theta is neg
for (Int_t i = 0; i < 3; i++) {
xv[3 + i] = -xv[2 - i];
yv[3 + i] = yv[2 - i];
Expand Down