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Question Related to G4logicalVolume associated with Sensitive Detector 

Forum: Hits, Digitization and Pileup
Date: 29 Apr, 2009
From: Pradip Datta <Pradip Datta>

Hi All,

I am new in Geant4 and have limited knowldge in C++.

My detector geometry has 32 readout segment (within a single detector). These segments are not identical in shape. So I construct them by different way but assign only one logical vol. for all of them (obviously I did that separately) and place them individually to construct my detector.

It seems working well and I will go ahead with this DetectorConstruction.cc. But before I make any other progress I would like to know "Is there any limitation of using same logicalvol with different solidname and place them as I have done". Kindly have look a part of the program (it is very simple) below:

Any support and comments are highly appreciated.

Thanks in advance

Pradip

        if(i==0)
        {
..........Solid with name "scyl1_strap2" is constructed here..............
lcyl1_strap1 = new G4LogicalVolume(scyl1_strap2,Ge,"logic_cyl2+trap2",0,0,0);

           for(G4int j=0;j<4;j++)
                {

//---------------------I have defined Z0Rot and x, y, z here---------------

pcyl1_strap1 = new G4PVPlacement(z0Rot,G4ThreeVector(x, y, z),lcyl1_strap1,"Cyld0_Trap1+2",logicWorld,false,i+10*j);

                }

        } // end if i==0     

if(i==1)
        {

...Solid with name "scyl1_strap1" is constructed here. It is of different shape.. lcyl1_strap1 = new G4LogicalVolume(scyl1_strap1,Ge,"logic_cyl1+trap1",0,0,0);

           for(G4int j=0;j<4;j++)
                {

//---------------------I have defined Z0Rot and x, y, z here---------------

pcyl1_strap1 = new G4PVPlacement(z0Rot,G4ThreeVector(x, y, z),lcyl1_strap1,"Cyld1_Trap1",logicWorld,false,i+10*j);

                }
        } // end if i==1    

Thus, you see, I have different shapes. I assigned same name lcyl1_strap1 and place them at different coordinates (definition of x,y,z is depends on j) within the "j" loop.

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