1. MICE PID Review 12 October 20061 Upstream PID simulation: Simulation Results II Hideyuki Sakamoto (Osaka Univ.) MICE Collaboration Meeting 12 th October 2006

2. MICE PID Review 12 October 20062 Contents Setup for G4MICE Setup for CKOV1 –Material –Geometry Summary

3. MICE PID Review 12 October 20063 Setup G4MICE Setup the latest version into the OSAKA local machine. –Compiler gcc3.2.3 –GEANT4 version 4.8.1 –CLHEP version 1.9.2.2 –CERNLIB version 2003 –ROOT version 5.10.0 –GSL version 1.8

4. MICE PID Review 12 October 20064 CKOV Geometry Based on the geometry file from Ghislain. Object per detection unitShapeX,Y [mm]Z [mm]DZ [mm]Material Entrance windowBOX450.02.55.0Polyacetal MirrorBOX450.06.53.0B270 Aerogel radiatorBOX450.020.523.0Aerogel Glass windowBOX600.033.53.0B270 Conical mirror“Conical”Variable VariblePolycarbonate Exit windowBOX450.0344.05.0Polyacetal

5. MICE PID Review 12 October 20065 Improvements for G4MICE Adding Materials –aerogel1 :Density=0.251 (g/cm 3 ) Si:O = 0.467 : 0.533 –aerogel2 :Density=0.430 (g/cm 3 ) Si:O = 0.467 : 0.533 –polyacetal :Density=1.41 (g/cm 3 ) C:H:O=0.375 : 0.125 : 0.5 –B270 :Density=2.44 (g/cm 3 ) Si:O:B:Na:K:Ca = 0.319 :0.486 : 0.033 : 0.057 :0.099 :0.007 Adding Geometry for Mirror –Conical shapes: will be imported from CAD file Information from Kenny’s email

6. MICE PID Review 12 October 20066 Materials in G4MICE Materials are easy to be added into G4MICE –Defined ${MICE_PATH}/MICE/Simulation/src/FillMaterials.cc e.g. aerogel1 ****************************************************** // Aerogel for CKOV1 in Vessel1 G4double density = 0.251*g/cm3; std::string name = "AEROGEL_1"; G4Material* aero1 = new G4Material(name,density, nComp=2, kStateSolid); aero1->AddElement(elSi, 46.7*perCent); aero1->AddElement(elO, 53.3*perCent); run.miceMaterials->addMaterial( aero1, name );

7. MICE PID Review 12 October 20067 Geometry in G4MICE Easy to include geometries with simple or pre-installed in Geant4 shapes(e.g. BOX,TUBE..) –BOX : for Entrace/Exit Window, Aerogel radiator Not so easy to include complex shapes. –“Conical”: for Mirror –Installing by reading from a CAD file(STEPAP203) seems to be easy to build in.

8. MICE PID Review 12 October 20068 Conical mirror to be included From Ghislain ’ s 3D CAD file Beam Here PMT is located. From L. Cremaldi

9. MICE PID Review 12 October 20069 Source of geometry in G4MICE ${MICE_PATH}/MICE/Simulation/src/MICEDetectorConstruction.cc ***************************************************************************** else if ( detector == "EmCalKLFiber" ) { EmCalKLFiber* fiber = new EmCalKLFiber( mod, mat, moth); logic = fiber->logicalFiber(); place = fiber->placementFiber(); } else if ( detector == "CkovMirror" ) { CkovMirror* mirror = new CkovMirror( mod, mat, moth); logic = mirror->logicalMirror(); place = mirror->placementMirror(); } Code for EmCal Boxes for aerogel or windows are defined bellow Objects to make Ckov mirror, from which CAD file to be readed.

10. MICE PID Review 12 October 200610 CkovMirror::CkovMirror( MiceModule* mod, G4Material* mater, G4VPhysicalVolume *mlv ) { G4AssemblyCreator MyAC("Ckov_mirror.stp"); // Associate a creator to a given STEP file. MyAC.ReadStepFile(); // Reads the STEP file. STEPentity* ent=0; // No predefined STEP entity in this example. A dummy pointer is used. MyAC.CreateG4Geometry(*ent); // Generates GEANT4 geometry objects. void *pl = MyAC.GetCreatedObject(); // Retrieve vector of placed entities. G4Assembly* assembly = new G4Assembly(); // An assembly is an aggregation of placed entities. assembly->SetPlacedVector(*(G4PlacedVector*)pl); // Initialise the assembly. G4int solids = assembly->GetNumberOfSolids(); // Get the total number of solids among all entities. for(G4int c=0; c<solids; c++) // Generate logical volumes and placements for each defined solid. { G4PlacedSolid* ps = assembly->GetPlacedSolid(c); G4LogicalVolume* logicMirror = new G4LogicalVolume(ps->GetSolid(), mater, "STEPlog"); G4RotationMatrix* hr = ps->GetRotation(); G4ThreeVector* tr = ps->GetTranslation(); // G4VPhysicalVolume* pv = new G4PVPlacement(hr, *tr, ps->GetSolid()->GetName(), lv, // experimentalHall_phys, false, c); G4VPhysicalVolume* physiMirror = new G4PVPlacement( hr, *tr, logicMirror, ps->GetSolid()- >GetName(), mlv->GetLogicalVolume(), false, c ); } Class for CkovMirror

11. MICE PID Review 12 October 200611 Reading CAD file Geant4 can make the geometry from CAD file (STEP AP203) –Need to publish in format of STEP with some third-party software, cannot be read with raw CAD format (dwg,dxf) –STEP/STEPinterface in Geant4 will provide interfaces to read STEP files.

12. MICE PID Review 12 October 200612 !!..BUT, Unfortunately, those interfaces were dropped off from Geant4 when version4.6 was released. Not supported any more…>< –Is there any interface to read CAD file? Anyway, I tried using Geant4.5.p02 source code for STEP/STEPinterface, but not success to compile so far. –[My Question]: Is this no problem to use such dropped off codes even if compile will succeed ?

13. MICE PID Review 12 October 200613 Present Status Material: AIR for all Geometry: BOX for all –Conical mirror is replaced with BOX shapes. I did not commit the source code yet, but will be done soon. –So far, the only problem is geometry for Conical mirror.

14. MICE PID Review 12 October 200614 Beam Detection unit#1Detection unit#2 Conical mirror (but box … ) Exit window Glass window Radiator (box) Mirror Entrance window Side View

15. MICE PID Review 12 October 200615 Summary Setup for CKOV1 was almost done except for Conical shapes for mirror. There is a problem to read CAD file for building the conical mirror. If the above problems will be solved, setup for CKOV1 can be finished => GOTO Simulation !!