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Question Holes in a triangular pattern in layered strucutre 

Forum: Geometry
Date: 11 Mar, 2015
From: Daniel M <Daniel M>

Hi,

I have a question about the best way of going about creating a layered structure of eight (8) layers with alternating materials which also has cylindrical holes in them in a equilateral triangular pattern, much like the one you would see in a gas electron multiplier. My first approach was to make a rectangular box from which 8 cylinders were removed one at a time from previous resulting boolean solid (see attached image) and then replicate it to a desired area (in x and y directions, and then "stacking" such boxes on top of eachother to create the full geometry. This results in a coumpound boolean solid which i have a feeling isn't very cheap.

Since i want to be able to gather energy deposited at x,y,z in such structure, including the holes which are intended to be filled with a gas mixture, using a sensitive detector i guess i need to be able to identify the holes somehow, which this geometry probably wont allow.

How do i make something similiar which allows me more freedom to pick out individual holes (or atleast include all of them) which also go through several layers?

My gut tells me using a clever parametrisation could be used for this, but I'm not sure how to do that given that i'm quite new to geant4.

I hope that the problem is clear, please let me know if you need further information.

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      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/03/11/01.37-92545-geom.png

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1 None: Re: Holes in a triangular pattern in layered strucutre   (John Apostolakis - 11 Mar, 2015)
(_ None: Re: Holes in a triangular pattern in layered strucutre   (Daniel M - 11 Mar, 2015)
(_ None: Re: Holes in a triangular pattern in layered strucutre   (John Apostolakis - 11 Mar, 2015)
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