p+ contact for the Ortec detectors

[tdixon97]

Ortec detectors (PPC and some ICPC) are implemented with sunken cylindrical p+ contacts (for example the r,z profile below of P00661C).

However, in reality these detectors have a spherical p+ contact geometry.

It may be nice to correct this, although I doubt the effect is large.

[ManuelHu]

I see. I did not originally write this code, but a general problem with the polycones is that they cannot (easily) represent spherical segments.

We could only approximate it by some cone segments...

[tdixon97]

I guess you could also make it via a subtraction of a G4Sphere, but the geometry being a subtraction solid not a G4GenericPolycone is annoying and harder to work with

[gipert]

Yeah no subtractions please. If you think that the square dimple is not ok we could approximate the sphere with a couple more points.

[tdixon97]

I think this will only matter if we try to simulate alphas. Maybe we can chose the square depth so as keeping the area correct?

[gipert]

Yes that's I guess the right thing to do