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Keywords: optical, efficiency
Forum: Hits, Digitization and Pileup
Re: Question Optical surface efficiency (Matt Orr)
Date: 10 Jan, 2005
From: Gumplinger Peter <Gumplinger Peter>

I have two questions regarding optical photon detection at a surface:

1) I've noticed that there are fluctations about the user specified efficiency value entered as an optical surface property. Specifically the efficiency appears NOT to be a simple multiplicative factor. I assume the fluctuations about this specified mean are Poisson in nature. Can this be confirmed as there is no documentation I have found that clarifies this?

The 'efficiency' should be just a multiplicative factor. It wasn't always in the past for rough surfaces because the efficiency was applied (sampled) at every encounter with the surface. It is possible that for a very rough surface the reflected ray still points toward the nominal surface normal. In patch02 for G4.6.2 and in G4.7 this has been corrected so that the user gets the efficiency back she/he has input, independent of how rough the surface was specified.

2) I understand that I can give the efficiency as a function of optical photon energy. Is the efficiency array treated as a histogram (constant mean between array entries) or is there interpolation between array values?

The efficiency, like all other optical properties, are linear interpolated between the provided table values.

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