[Rich] H12700 review

[Valery Kubarovsky]

I would like to add that we want to send this review to Hamamatsu. We got
this request 2 weeks ago.
I want your opinion about this as well.
Regards,
Valery


On Tue, Aug 19, 2014 at 3:21 PM, Andrey Kim <kenjo at jlab.org> wrote:

>  Dear collaborators,
> Please find H12700-H8500 comparison review here:
> https://userweb.jlab.org/~kenjo/H12700report.pdf
>
> "Short" summary: *H12700 is still better than H8500 due to the higher
> photocathode quantum efficiency.* The nearly uniform illumination of
> pixel shows that SPE spectrum is not as good as it was anticipated. It has
> more complicated structure than H8500. The structure was described using
> Pavel Degtiarenko's model, and using his model's fit results the collection
> efficiency was estimated for both MAPMT types. The H8500 demonstrated
> higher collection efficiency than H12700 (unexpected and rather saddening
> behaviour). Fortunately, H12700 has higher photocathode quantum efficiency,
> and it was determinative factor in H12700 superiority.
> Please note that separation of quantum and collection efficiencies is
> possible *within model framework only.* However, the *global efficiency
> (decisive criteria)* is model independent as it is the fraction of events
> with signal over pedestal's 5 sigma (assuming, of course, that light source
> is stable and constant).
> Any comments, suggestions or corrections are welcome!
> Thank you!
>
>
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