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Forum: Processes Involving Optical Photons
Re: Question Odd behaviour surrounding Cherenkov angles (Remy Prechelt)
Re: Feedback Re: Odd behaviour surrounding Cherenkov angles (Gumplinger Peter)
Date: 28 Apr, 2017
From: Remy Prechelt <Remy Prechelt>

Thanks for the quick response!

I have verified the statements that you mentioned in your reply using the (x,y,z) locations of every step point. The PreStepPoint is the origin of a Cherenkov photon (on the z-axis, x=y=0), and the PostStepPoint of this photon occurs exactly at z=5.0. This (x,y,z) location is also identical to the PreStepPoint of the step through the expansion volume.

These agree perfectly with my previous message. If I get the (x,y,z) location of PostStepPoint (on the radiator boundary) and the PreStepPoint location of the origin of the Cherenkov photon, and then use x,y to compute a radius, and use that radius and the difference in z to compute the angle between those two points, I again get the 1.1500034 value, despite the modified G4Cerenkov.cc creating a photon with a Cherenkov angle equivalent to n=1.150000000000046.

Any ideas? I'm willing to try anything and everything to figure out what is going on here.

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