|Message: Re: Proper use of G4PVParameterised||Not Logged In (login)|
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On Mon, 30 Jul 2018 14:32:36 GMT, Joseph DeCunha wrote:
> I've been working with G4PVParameterised for some time now, and have > just come across some code from a colleague and find that they > initialize the class differently than I do. To remind you the primary > constructor for G4PVParameterised is: > > G4PVParameterised (const G4String &pName, G4LogicalVolume *pLogical, > G4LogicalVolume *pMotherLogical, const EAxis pAxis, const G4int > nReplicas, G4VPVParameterisation *pParam, G4bool pSurfChk=false) > > I've referred to all of the resources I can find online and have found a > satisfactory explanation for all of the arguments for G4PVParameterised > except for pLogical. My question is, what is the pLogical input supposed > to be? Does the shape of pLogical have to be the same as the > parameterized volumes that are then placed many times?
Yes, exactly. The pLogical _is_ the little volume that is placed many times as daughters of pMotherLogical. I have an example where I'm modeling the lithography mask for a bunch of sensors on a wafer. pMotherLogical is a thin disk the size of the wafer, and pLogical is one sensor.
However, as discussed in the G4 Application Developer's Guide, you can only use a very small number of _simple_ shapes for pLogical. You can't build a complex boolean solid, and you can't even use some of the non-trivial CSG solids (like elliptical tubes).
-- Michael Kelsey