sPHENIX EMCal discussion

[Nils Feege <nils.feege AT stonybrook.edu>]

Hi John,

if you were worried about the additional complications from pixels firing multiple times during one event, you could maybe consider choosing a SiPM with a larger quenching resistor that makes the pixel recovery time longer than the light pulse (pixel recovery time = pixel quenching resistor * pixel capacitance). That's what we did for the CALICE SiPM hadron calorimeter (see e.g. http://iopscience.iop.org/article/10.1088/1748-0221/5/05/P05004/pdf).

Best,

Nils

On Thu, Oct 8, 2015 at 11:34 PM, John Haggerty <haggerty AT bnl.gov> wrote:

This is an interesting preprint about the saturation behavior of SiPM's:

> Functions Represent SiPM Response Especially Linear Behavior After Saturation
> Katsushige Kotera, Weonseok Choi, Tohru Takeshita
> http://arxiv.org/abs/1510.01102

They show evidence that a pixel could fire more than once during
illumination, so they could behave as if there are more than the
geometric number of pixels.  I don't see that it makes much difference
to us, since I think we are likely to be far from saturation, but if we
did have to correct for saturation we would have to think about exactly
how to do it with our shaping time.

--
John Haggerty
email: haggerty AT bnl.gov
cell: 631 741 3358
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Dr. Nils Feege

Postdoctoral Associate

SUNY at Stony Brook

Department of Physics & Astronomy

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