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Forum: Processes Involving Optical Photons
Re: Question LogicalSkinSurface (Atsuko Kibayashi)
Date: 11 Feb, 2014
From: Gumplinger Peter <Gumplinger Peter>

Dear Atsuko,

> I would like to install photomultiplier tubes with different sizes in my
> water Cherenkov detector. So the natural way to go is to build Solid,
> Logical Volume and Physical Volume for each PMT size.


> My problem is that I use LogicalSkinSurface to count the photons on the
> cathode in the PMT glass mother volume.

Good choice!

> However there is the limitation
> to it that I can only place one logical volume. Is that correct?

No, you can place a logical volume as many times as you like! The 'logical volume' remains the same, but the placements have different copy numbers. In the simplest case, a logical volume is a solid (with defined absolute dimensions) imputed with a material. If your solid changes, even if just the dimension and with the shape remaining the same, you've still got to define a new 'logical volume'.

> Maybe I can make different solids, having the same logical volume name

Well, that's not possible. You have different solids and consequently different logical volumes.

> and placing them in the SkinSurface.

You instantiate a LogicalSkinSurface with a logical volume pointer as an argument.

> Is it possible? Can I call
> LogicalSkinSurface multiple times?

Hence, you need as many LogicalSkinSurfaces as you have LogicalVolumes. Note, however, the LogicalSkinSurfaces may all have the same physical surface properties, e.g. be defined with the same implementation of G4OpticalSurface.

Curious, what project are you working on? Have you seen my code for HyperK simulation using WCSim?


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1 Ok: Re: LogicalSkinSurface   (Atsuko Kibayashi - 12 Feb, 2014)
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