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Remove air pockets from the beampipe #15879

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Remove air pockets from the beampipe #15879

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febbf75
Place the vacuum mothers of the RB24/3 copper tubes and the RB24 valv…
sawenzel Sep 30, 2026
2b7cd2b
Fill the bore of the RB24 pumping modules in caveRB24 with vacuum
sawenzel Sep 30, 2026
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19 changes: 15 additions & 4 deletions Detectors/Passive/src/Pipe.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -1277,8 +1277,8 @@ void Pipe::ConstructGeometry()
// Position all volumes
Float_t y0;
TGeoVolumeAssembly* voRB24ValveMo = new TGeoVolumeAssembly("RB24ValveMo");
voRB24ValveMo->AddNode(voRB24ValveFl, 1, new TGeoTranslation(0., 0., -7.5 / 2. + kRB24ValveFlD / 2.));
voRB24ValveMo->AddNode(voRB24ValveFl, 2, new TGeoTranslation(0., 0., +7.5 / 2. - kRB24ValveFlD / 2.));
voRB24ValveMo->AddNode(voRB24ValveFlI, 1, new TGeoTranslation(0., 0., -7.5 / 2. + kRB24ValveFlD / 2.));
voRB24ValveMo->AddNode(voRB24ValveFlI, 2, new TGeoTranslation(0., 0., +7.5 / 2. - kRB24ValveFlD / 2.));
y0 = -21.5;
voRB24ValveMo->AddNode(voRB24ValveBoM, 1, new TGeoTranslation(0., y0 + kRB24ValveBoWy / 2., 0.));
y0 += kRB24ValveBoWy;
Expand Down Expand Up @@ -1591,6 +1591,15 @@ void Pipe::ConstructGeometry()
z = kRB24VMABCRBT1L / 2. + newRB24B1BellowUndL + kRB24VMABBEConTubeL1 + kRB24VMABBEConTubeL2 - kRB24VMABCCTL + 1.;
voRB24VMABCRB->AddNode(voRB24VMABRFCT, 1, new TGeoTranslation(0., 0., z));

// Vacuum in the bore, from the transition tube to the end of the RF contact, at the inner radius
// of both. Placed beside the copies in caveRB24 only: in the barrel the aluSideA pipe runs through it.
const double kRB24VMABCVacZ0 = -kRB24VMABCRBT1L / 2. - 1.;
const double kRB24VMABCVacZ1 = z + kRB24VMABCCTL;
const double kRB24VMABCVacZc = (kRB24VMABCVacZ0 + kRB24VMABCVacZ1) / 2.;
TGeoVolume* voRB24VMABCVac = new TGeoVolume(
"RB24VMABCVac", new TGeoTube(0., 6.3 / 2., (kRB24VMABCVacZ1 - kRB24VMABCVacZ0) / 2.), kMedVacNF);
voRB24VMABCVac->SetVisibility(0);

//
// Assembling RB24/1
//
Expand All @@ -1612,6 +1621,7 @@ void Pipe::ConstructGeometry()
// VMABC close to compensator magnet
z = -kRB24cCuTubeL / 2. - (kRB24VMABCL - kRB24VMABCRBT1L / 2) + 1.;
voRB24C->AddNode(voRB24VMABCRB, 2, new TGeoTranslation(0., 0., z));
voRB24C->AddNode(voRB24VMABCVac, 2, new TGeoTranslation(0., 0., z + kRB24VMABCVacZc));
// <-

// Bellow
Expand Down Expand Up @@ -1691,15 +1701,15 @@ void Pipe::ConstructGeometry()

TGeoVolume* voRB243CuTubeM =
new TGeoVolume("voRB243CuTubeM", new TGeoTube(0., kRB24CuTubeRo, kRB243CuTubeL / 2.), kMedVacNF);
voRB24CuTubeM->SetVisibility(0);
voRB243CuTubeM->SetVisibility(0);
TGeoVolume* voRB243CuTube =
new TGeoVolume("voRB243CuTube", new TGeoTube(kRB24CuTubeRi, kRB24CuTubeRo, kRB243CuTubeL / 2.), kMedCuNF);
voRB243CuTubeM->AddNode(voRB243CuTube, 1, gGeoIdentity);

TGeoVolumeAssembly* voRB243 = new TGeoVolumeAssembly("RB243");
TGeoVolumeAssembly* voRB243A = new TGeoVolumeAssembly("RB243A");

voRB243A->AddNode(voRB243CuTube, 1, gGeoIdentity);
voRB243A->AddNode(voRB243CuTubeM, 1, gGeoIdentity);
z = -kRB243CuTubeL / 2 + kRB24CuTubeFL / 2.;
voRB243A->AddNode(voRB24CuTubeF, 5, new TGeoTranslation(0., 0., z));
z = +kRB243CuTubeL / 2 - kRB24CuTubeFL / 2.;
Expand All @@ -1714,6 +1724,7 @@ void Pipe::ConstructGeometry()

z = -2. * (kRB243CuTubeL + kRB24B1L) - (kRB24VMABCL - kRB24VMABCRBT1L / 2) + 1.;
voRB243->AddNode(voRB24VMABCRB, 3, new TGeoTranslation(0., 0., z));
voRB243->AddNode(voRB24VMABCVac, 3, new TGeoTranslation(0., 0., z + kRB24VMABCVacZc));

z = -kRB24cCuTubeL / 2 - kRB24VMABCL - kRB242CuTubeL - 1.2;
voRB24C->AddNode(voRB243, 1, new TGeoTranslation(0., 0., z));
Expand Down
2 changes: 1 addition & 1 deletion Detectors/Passive/src/PipeRun4.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -1568,7 +1568,7 @@ void PipeRun4::ConstructGeometry()
TGeoVolumeAssembly* voRB243 = new TGeoVolumeAssembly("RB243");
TGeoVolumeAssembly* voRB243A = new TGeoVolumeAssembly("RB243A");

voRB243A->AddNode(voRB243CuTube, 1, gGeoIdentity);
voRB243A->AddNode(voRB243CuTubeM, 1, gGeoIdentity);
z = -kRB243CuTubeL / 2 + kRB24CuTubeFL / 2.;
voRB243A->AddNode(voRB24CuTubeF, 5, new TGeoTranslation(0., 0., z));
z = +kRB243CuTubeL / 2 - kRB24CuTubeFL / 2.;
Expand Down
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