|Message: Re: Question about the photocathode simulation and how to Detect the photon?||Not Logged In (login)|
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> I can not get the detected photons, because I detected them in the > photocathode volume. I changed to do it in the PMT windows volume, the > problem is solved.
I don't understand ... if you followed the LXe example, you should get the boundary status 'Detection' only when the photon is absorbed at your metalic photocathode surface, with a probability set by your efficiency. A photon can reflect off the PMT window at which point is should not be considered as being detected. In theory, it can also enter the glass and be absorbed in it before hitting the photocathode.
The thing is that the conventional definition of a 'sensitive volume' does not work for this kind of 'detector' because the photon never actually goes "into" the metalic photocathode. Therefore, you need to code the call to ProcessHits in your SteppingAction.
> By the way, if you have time, could you please give me the definition of > local normal and global normal, right now, I am still not quit clear > about them.
See my other reply.
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