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Improved description of IB FPC capacitors (#14805)
* Improved description of IB FPC capacitors * Fix clang format
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-65
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3 files changed

+108
-65
lines changed

‎Detectors/ITSMFT/ITS/simulation/include/ITSSimulation/V3Layer.h‎

Lines changed: 43 additions & 37 deletions
Original file line numberDiff line numberDiff line change
@@ -353,43 +353,49 @@ class V3Layer : public V11Geometry
353353
static const Int_t sIBNChipRows; ///< IB chip rows in module
354354
static const Double_t sIBChipZGap; ///< Gap between IB chips on Z
355355

356-
static const Double_t sIBModuleZLength; ///< IB Module Length along Z
357-
static const Double_t sIBFPCWiderXPlus; ///< FPC protrusion at X>0
358-
static const Double_t sIBFPCWiderXNeg; ///< FPC protrusion at X<0
359-
static const Double_t sIBFlexCableAlThick; ///< Thickness of FPC Aluminum
360-
static const Double_t sIBFPCAlGNDWidth; ///< Width of total FPC Al Gnd
361-
static const Double_t sIBFPCAlAnodeWidth1; ///< Width of FPC Al Anode
362-
static const Double_t sIBFPCAlAnodeWidth2; ///< Width of FPC Al Anode
363-
static const Double_t sIBFlexCableKapThick; ///< Thickness of FPC Kapton
364-
static const Double_t sIBFlexCablePolyThick; ///< Thickness of FPC Coverlay
365-
static const Double_t sIBFlexCapacitorXWid; ///< IB capaictor X width
366-
static const Double_t sIBFlexCapacitorYHi; ///< IB capaictor Y height
367-
static const Double_t sIBFlexCapacitorZLen; ///< IB capaictor Z length
368-
static const Double_t sIBColdPlateWidth; ///< IB cold plate X width
369-
static const Double_t sIBColdPlateZLen; ///< IB cold plate Z length
370-
static const Double_t sIBGlueThick; ///< IB glue thickness
371-
static const Double_t sIBCarbonFleeceThick; ///< IB carbon fleece thickness
372-
static const Double_t sIBCarbonPaperThick; ///< IB Carbon Paper Thickness
373-
static const Double_t sIBCarbonPaperWidth; ///< IB Carbon Paper X Width
374-
static const Double_t sIBCarbonPaperZLen; ///< IB Carbon Paper Z Length
375-
static const Double_t sIBK13D2UThick; ///< IB k13d2u prepreg thickness
376-
static const Double_t sIBCoolPipeInnerD; ///< IB cooling inner diameter
377-
static const Double_t sIBCoolPipeThick; ///< IB cooling pipe thickness
378-
static const Double_t sIBCoolPipeXDist; ///< IB cooling pipe separation
379-
static const Double_t sIBCoolPipeZLen; ///< IB cooling pipe length
380-
static const Double_t sIBTopVertexWidth1; ///< IB TopVertex width
381-
static const Double_t sIBTopVertexWidth2; ///< IB TopVertex width
382-
static const Double_t sIBTopVertexHeight; ///< IB TopVertex height
383-
static const Double_t sIBTopVertexAngle; ///< IB TopVertex aperture angle
384-
static const Double_t sIBSideVertexWidth; ///< IB SideVertex width
385-
static const Double_t sIBSideVertexHeight; ///< IB SideVertex height
386-
static const Double_t sIBTopFilamentSide; ///< IB TopFilament side
387-
static const Double_t sIBTopFilamentAlpha; ///< IB TopFilament angle
388-
static const Double_t sIBTopFilamentInterZ; ///< IB TopFilament Z interdist
389-
static const Double_t sIBEndSupportThick; ///< IB end support thickness
390-
static const Double_t sIBEndSupportZLen; ///< IB end support length
391-
static const Double_t sIBEndSupportXUp; ///< IB end support X up wide
392-
static const Double_t sIBEndSupportOpenPhi; ///< IB end support opening phi
356+
static const Double_t sIBModuleZLength; ///< IB Module Length along Z
357+
static const Double_t sIBFPCWiderXPlus; ///< FPC protrusion at X>0
358+
static const Double_t sIBFPCWiderXNeg; ///< FPC protrusion at X<0
359+
static const Double_t sIBFlexCableAlThick; ///< Thickness of FPC Aluminum
360+
static const Double_t sIBFPCAlGNDWidth; ///< Width of total FPC Al Gnd
361+
static const Double_t sIBFPCAlAnodeWidth1; ///< Width of FPC Al Anode
362+
static const Double_t sIBFPCAlAnodeWidth2; ///< Width of FPC Al Anode
363+
static const Double_t sIBFlexCableKapThick; ///< Thickness of FPC Kapton
364+
static const Double_t sIBFlexCablePolyThick; ///< Thickness of FPC Coverlay
365+
static const Double_t sIBFlexCapacitor1XWid; ///< IB small capacitor X width
366+
static const Double_t sIBFlexCapacitor1YHi; ///< IB small capacitor Y height
367+
static const Double_t sIBFlexCapacitor1ZLen; ///< IB small capacitor Z length
368+
static const Double_t sIBFlexCapacitor22XWid; ///< IB large capacitor X width
369+
static const Double_t sIBFlexCapacitor22YHi; ///< IB large capacitor Y height
370+
static const Double_t sIBFlexCapacitor22ZLen; ///< IB large capacitor Z length
371+
static const Double_t sIBFlexResistorXWid; ///< IB FPC resistor X width
372+
static const Double_t sIBFlexResistorYHi; ///< IB FPC resistor Y height
373+
static const Double_t sIBFlexResistorZLen; ///< IB FPC resistor Z length
374+
static const Double_t sIBColdPlateWidth; ///< IB cold plate X width
375+
static const Double_t sIBColdPlateZLen; ///< IB cold plate Z length
376+
static const Double_t sIBGlueThick; ///< IB glue thickness
377+
static const Double_t sIBCarbonFleeceThick; ///< IB carbon fleece thickness
378+
static const Double_t sIBCarbonPaperThick; ///< IB Carbon Paper Thickness
379+
static const Double_t sIBCarbonPaperWidth; ///< IB Carbon Paper X Width
380+
static const Double_t sIBCarbonPaperZLen; ///< IB Carbon Paper Z Length
381+
static const Double_t sIBK13D2UThick; ///< IB k13d2u prepreg thickness
382+
static const Double_t sIBCoolPipeInnerD; ///< IB cooling inner diameter
383+
static const Double_t sIBCoolPipeThick; ///< IB cooling pipe thickness
384+
static const Double_t sIBCoolPipeXDist; ///< IB cooling pipe separation
385+
static const Double_t sIBCoolPipeZLen; ///< IB cooling pipe length
386+
static const Double_t sIBTopVertexWidth1; ///< IB TopVertex width
387+
static const Double_t sIBTopVertexWidth2; ///< IB TopVertex width
388+
static const Double_t sIBTopVertexHeight; ///< IB TopVertex height
389+
static const Double_t sIBTopVertexAngle; ///< IB TopVertex aperture angle
390+
static const Double_t sIBSideVertexWidth; ///< IB SideVertex width
391+
static const Double_t sIBSideVertexHeight; ///< IB SideVertex height
392+
static const Double_t sIBTopFilamentSide; ///< IB TopFilament side
393+
static const Double_t sIBTopFilamentAlpha; ///< IB TopFilament angle
394+
static const Double_t sIBTopFilamentInterZ; ///< IB TopFilament Z interdist
395+
static const Double_t sIBEndSupportThick; ///< IB end support thickness
396+
static const Double_t sIBEndSupportZLen; ///< IB end support length
397+
static const Double_t sIBEndSupportXUp; ///< IB end support X up wide
398+
static const Double_t sIBEndSupportOpenPhi; ///< IB end support opening phi
393399

394400
static const Double_t sIBConnectorXWidth; ///< IB Connectors Width
395401
static const Double_t sIBConnectorYTot; ///< IB Connectors total height

‎Detectors/ITSMFT/ITS/simulation/src/Detector.cxx‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -477,10 +477,11 @@ void Detector::createMaterials()
477477
Float_t dInox304 = 7.85;
478478

479479
// Ceramic (for IB capacitors) (BaTiO3)
480+
// Density includes soldering
480481
Float_t aCeramic[3] = {137.327, 47.867, 15.999};
481482
Float_t zCeramic[3] = {56, 22, 8}; // Ba, Ti, O
482483
Float_t wCeramic[3] = {1, 1, 3}; // Molecular composition
483-
Float_t dCeramic = 6.02;
484+
Float_t dCeramic = 8.28;
484485

485486
// Rohacell (C9 H13 N1 O2)
486487
Float_t aRohac[4] = {12.01, 1.01, 14.010, 16.};

‎Detectors/ITSMFT/ITS/simulation/src/V3Layer.cxx‎

Lines changed: 63 additions & 27 deletions
Original file line numberDiff line numberDiff line change
@@ -61,9 +61,15 @@ const Double_t V3Layer::sIBFPCAlAnodeWidth1 = 13.0 * sMm;
6161
const Double_t V3Layer::sIBFPCAlAnodeWidth2 = 14.7 * sMm;
6262
const Double_t V3Layer::sIBFlexCableKapThick = 75.0 * sMicron;
6363
const Double_t V3Layer::sIBFlexCablePolyThick = 20.0 * sMicron;
64-
const Double_t V3Layer::sIBFlexCapacitorXWid = 0.2 * sMm;
65-
const Double_t V3Layer::sIBFlexCapacitorYHi = 0.2 * sMm;
66-
const Double_t V3Layer::sIBFlexCapacitorZLen = 0.4 * sMm;
64+
const Double_t V3Layer::sIBFlexCapacitor1XWid = 0.5 * sMm;
65+
const Double_t V3Layer::sIBFlexCapacitor1YHi = 0.5 * sMm;
66+
const Double_t V3Layer::sIBFlexCapacitor1ZLen = 1.0 * sMm;
67+
const Double_t V3Layer::sIBFlexCapacitor22XWid = 0.7 * sMm;
68+
const Double_t V3Layer::sIBFlexCapacitor22YHi = 0.6 * sMm;
69+
const Double_t V3Layer::sIBFlexCapacitor22ZLen = 1.1 * sMm;
70+
const Double_t V3Layer::sIBFlexResistorXWid = 0.2 * sMm;
71+
const Double_t V3Layer::sIBFlexResistorYHi = 0.2 * sMm;
72+
const Double_t V3Layer::sIBFlexResistorZLen = 0.4 * sMm;
6773
const Double_t V3Layer::sIBColdPlateWidth = 15.4 * sMm;
6874
const Double_t V3Layer::sIBColdPlateZLen = 290.0 * sMm;
6975
const Double_t V3Layer::sIBGlueThick = 50.0 * sMicron;
@@ -599,8 +605,11 @@ TGeoVolume* V3Layer::createModuleInnerB(const Double_t xchip, const Double_t zch
599605
// the module as a TGeoVolume
600606
//
601607
// Updated: 03 Apr 2021
608+
// Updated: 03 Nov 2025 Change volume from BBox to Xtru to avoid fake overlaps
602609

603610
Double_t xtot, ytot, ztot;
611+
Double_t ymid, shrinkFactor = 0.73;
612+
Double_t xv[5], yv[5];
604613
Double_t xpos, ypos, zpos;
605614
const Int_t nameLen = 30;
606615
char volumeName[nameLen];
@@ -619,9 +628,25 @@ TGeoVolume* V3Layer::createModuleInnerB(const Double_t xchip, const Double_t zch
619628
Double_t ygnd = (static_cast<TGeoBBox*>(aluGndCableVol->GetShape()))->GetDY();
620629
Double_t yano = (static_cast<TGeoBBox*>(aluAnodeCableVol->GetShape()))->GetDY();
621630

622-
ytot = sIBGlueThick / 2 + ygnd + sIBFlexCableKapThick / 2 + yano + sIBFlexCapacitorYHi / 2;
631+
ytot = sIBGlueThick / 2 + ygnd + sIBFlexCableKapThick / 2 + yano + sIBFlexCapacitor22YHi / 2;
632+
ymid = sIBGlueThick / 2 + ygnd + sIBFlexCableKapThick / 2 + yano;
623633

624-
TGeoBBox* module = new TGeoBBox(xtot, ytot, ztot);
634+
xv[0] = xtot;
635+
yv[0] = -ytot;
636+
xv[1] = xv[0];
637+
yv[1] = yv[0] + 6 * ymid;
638+
xv[2] = xtot * shrinkFactor;
639+
yv[2] = ytot;
640+
xv[3] = -xtot;
641+
yv[3] = yv[2];
642+
xv[4] = xv[3];
643+
yv[4] = yv[0];
644+
645+
TGeoXtru* module = new TGeoXtru(2);
646+
module->DefinePolygon(6, xv, yv);
647+
module->DefinePolygon(5, xv, yv);
648+
module->DefineSection(0, -ztot);
649+
module->DefineSection(1, ztot);
625650

626651
// Now the volumes
627652
TGeoMedium* medAir = mgr->GetMedium(Form("%s_AIR$", GetDetName()));
@@ -674,6 +699,7 @@ void V3Layer::createIBCapacitors(TGeoVolume* modvol, Double_t zchip, Double_t yz
674699
//
675700
// Created: 13 Feb 2018 Mario Sitta
676701
// Updated: 03 Apr 2019 Mario Sitta Fix positions (180' rotation)
702+
// Updated: 31 Oct 2025 Mario Sitta Fix dimensions and weight
677703
//
678704

679705
// Position of the various capacitors (A.Junique private communication
@@ -705,63 +731,72 @@ void V3Layer::createIBCapacitors(TGeoVolume* modvol, Double_t zchip, Double_t yz
705731
Double_t xpos, ypos, zpos;
706732
Int_t nCapacitors;
707733

708-
TGeoVolume *capacitor, *resistor;
734+
TGeoVolume *capacitorSmall, *capacitorLarge, *resistor;
709735

710-
// Check whether we already have the volume, otherwise create it
711-
// (so as to avoid creating multiple copies of the very same volume
736+
// Check whether we already have the volumes, otherwise create them
737+
// (so as to avoid creating multiple copies of the very same volumes
712738
// for each layer)
713-
capacitor = mgr->GetVolume("IBFPCCapacitor");
739+
// The "small" capacitor is the 1 uF substrate capacitor
740+
// The "large" capacitor is the 22 uF analog/digital PS capacitor
741+
capacitorSmall = mgr->GetVolume("IBFPCCapacitorSmall");
714742

715-
if (!capacitor) {
716-
TGeoBBox* capsh = new TGeoBBox(sIBFlexCapacitorXWid / 2, sIBFlexCapacitorYHi / 2, sIBFlexCapacitorZLen / 2);
743+
if (!capacitorSmall) {
744+
TGeoBBox* capSmsh = new TGeoBBox(sIBFlexCapacitor1XWid / 2, sIBFlexCapacitor1YHi / 2, sIBFlexCapacitor1ZLen / 2);
745+
TGeoBBox* capLgsh = new TGeoBBox(sIBFlexCapacitor22XWid / 2, sIBFlexCapacitor22YHi / 2, sIBFlexCapacitor22ZLen / 2);
717746

718747
TGeoMedium* medCeramic = mgr->GetMedium(Form("%s_CERAMIC$", GetDetName()));
719748

720-
capacitor = new TGeoVolume("IBFPCCapacitor", capsh, medCeramic);
721-
capacitor->SetLineColor(kBlack);
722-
capacitor->SetFillColor(kBlack);
749+
capacitorSmall = new TGeoVolume("IBFPCCapacitorSmall", capSmsh, medCeramic);
750+
capacitorSmall->SetLineColor(kBlack);
751+
capacitorSmall->SetFillColor(kBlack);
752+
753+
capacitorLarge = new TGeoVolume("IBFPCCapacitorLarge", capLgsh, medCeramic);
754+
capacitorLarge->SetLineColor(kBlack);
755+
capacitorLarge->SetFillColor(kBlack);
723756

724-
TGeoBBox* ressh = new TGeoBBox(sIBFlexCapacitorXWid / 2, // Resistors have
725-
sIBFlexCapacitorYHi / 2, // the same dim's
726-
sIBFlexCapacitorZLen / 2); // as capacitors
757+
TGeoBBox* ressh = new TGeoBBox(sIBFlexResistorXWid / 2,
758+
sIBFlexResistorYHi / 2,
759+
sIBFlexResistorZLen / 2);
727760

728761
resistor = new TGeoVolume("IBFPCResistor", ressh, medCeramic);
729762
resistor->SetLineColor(kBlack);
730763
resistor->SetFillColor(kBlack);
731764
} else { // Volumes already defined, get them
765+
capacitorLarge = mgr->GetVolume("IBFPCCapacitorLarge");
732766
resistor = mgr->GetVolume("IBFPCResistor");
733767
}
734768

735769
// Place all the capacitors (they are really a lot...)
736-
ypos = yzero + sIBFlexCapacitorYHi / 2;
770+
ypos = yzero + sIBFlexCapacitor22YHi / 2;
737771

738772
xpos = xGroup1A;
739773
for (Int_t j = 0; j < sIBChipsPerRow; j++) {
740774
zpos = -mIBModuleZLength / 2 + j * (2 * zchip + sIBChipZGap) + zchip + zGroup1A[0];
741-
modvol->AddNode(capacitor, 2 * j + 1, new TGeoTranslation(-xpos, ypos, -zpos));
775+
modvol->AddNode(capacitorLarge, 2 * j + 1, new TGeoTranslation(-xpos, ypos, -zpos));
742776
zpos = -mIBModuleZLength / 2 + j * (2 * zchip + sIBChipZGap) + zchip + zGroup1A[1];
743-
modvol->AddNode(capacitor, 2 * j + 2, new TGeoTranslation(-xpos, ypos, -zpos));
777+
modvol->AddNode(capacitorLarge, 2 * j + 2, new TGeoTranslation(-xpos, ypos, -zpos));
744778
}
745779

746780
nCapacitors = 2 * sIBChipsPerRow;
747781
xpos = xGroup1B;
748782
for (Int_t j = 0; j < sIBChipsPerRow; j++) {
749783
zpos = -mIBModuleZLength / 2 + j * (2 * zchip + sIBChipZGap) + zchip + zGroup1B;
750-
modvol->AddNode(capacitor, j + 1 + nCapacitors, new TGeoTranslation(-xpos, ypos, -zpos));
784+
modvol->AddNode(capacitorLarge, j + 1 + nCapacitors, new TGeoTranslation(-xpos, ypos, -zpos));
751785
}
752786

753787
nCapacitors += sIBChipsPerRow;
788+
ypos = yzero + sIBFlexCapacitor1YHi / 2;
754789
xpos = xGroup2;
755790
// We have only 8 in these group, missing the central one
756791
for (Int_t j = 0; j < sIBChipsPerRow - 1; j++) {
757792
zpos = -mIBModuleZLength / 2 + j * (2 * zchip + sIBChipZGap) + zchip + zGroup2;
758-
modvol->AddNode(capacitor, j + 1 + nCapacitors, new TGeoTranslation(-xpos, ypos, -zpos));
793+
modvol->AddNode(capacitorSmall, j + 1 + nCapacitors, new TGeoTranslation(-xpos, ypos, -zpos));
759794
}
760795

761796
nCapacitors += (sIBChipsPerRow - 1);
762797
xpos = xGroup3;
763798
zpos = zGroup3;
764-
modvol->AddNode(capacitor, 1 + nCapacitors, new TGeoTranslation(-xpos, ypos, -zpos));
799+
modvol->AddNode(capacitorSmall, 1 + nCapacitors, new TGeoTranslation(-xpos, ypos, -zpos));
765800

766801
nCapacitors++;
767802
for (Int_t j = 0; j < sIBChipsPerRow; j++) {
@@ -771,25 +806,26 @@ void V3Layer::createIBCapacitors(TGeoVolume* modvol, Double_t zchip, Double_t yz
771806
xpos = xGroup4[0];
772807
}
773808
zpos = -mIBModuleZLength / 2 + j * (2 * zchip + sIBChipZGap) + zchip + zGroup4[j];
774-
modvol->AddNode(capacitor, j + 1 + nCapacitors, new TGeoTranslation(-xpos, ypos, -zpos));
809+
modvol->AddNode(capacitorSmall, j + 1 + nCapacitors, new TGeoTranslation(-xpos, ypos, -zpos));
775810
}
776811

777812
nCapacitors += sIBChipsPerRow;
813+
ypos = yzero + sIBFlexCapacitor22YHi / 2;
778814
for (Int_t j = 0; j < nGroup5A; j++) {
779815
if (j == 0) {
780816
xpos = xGroup5A[0];
781817
} else {
782818
xpos = xGroup5A[1];
783819
}
784820
zpos = zGroup5A[j];
785-
modvol->AddNode(capacitor, j + 1 + nCapacitors, new TGeoTranslation(-xpos, ypos, -zpos));
821+
modvol->AddNode(capacitorLarge, j + 1 + nCapacitors, new TGeoTranslation(-xpos, ypos, -zpos));
786822
}
787823

788824
nCapacitors += nGroup5A;
789825
xpos = xGroup5B;
790826
for (Int_t j = 0; j < nGroup5B; j++) {
791827
zpos = zGroup5B[j];
792-
modvol->AddNode(capacitor, j + 1 + nCapacitors, new TGeoTranslation(-xpos, ypos, -zpos));
828+
modvol->AddNode(capacitorLarge, j + 1 + nCapacitors, new TGeoTranslation(-xpos, ypos, -zpos));
793829
}
794830

795831
// Place the resistors
@@ -1061,7 +1097,7 @@ TGeoVolume* V3Layer::createStaveModelInnerB4(const TGeoManager* mgr)
10611097
yv[1] = layerHeight + sIBSideVertexHeight + topfil->GetDZ();
10621098
;
10631099
xv[2] = sIBEndSupportXUp / 2;
1064-
yv[2] = sIBStaveHeight + sIBTopFilamentSide / sinD(-theta); // theta is neg
1100+
yv[2] = sIBStaveHeight + sIBTopFilamentSide / sinD(-theta) - 0.01; // theta is neg
10651101
for (Int_t i = 0; i < 3; i++) {
10661102
xv[3 + i] = -xv[2 - i];
10671103
yv[3 + i] = yv[2 - i];

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