sPHENIX HCal discussion

[Jamie Nagle <jamie.nagle AT colorado.edu>]

Hello All,

Using the LED tile scans shown earlier by Ron and Sebastian, I have written a light simulation program that does a reasonable job reproducing the relative light yield across the large panel.    Details are shown in the attached slides.

http://www.phenix.bnl.gov/WWW/publish/nagle/sPHENIX/nagle_sphenix_hcaltilesimulation_11122105.pdf

One question is whether the LED light penetrating through the white coating on the non-fiber side of the scintillator really has the right response in terms of how quickly the signal falls off as one moves away from the fiber.   There is a good comparison of the LED data and the cosmic data, but that does not have the resolution to discriminate this type of feature.    A natural follow up that Ron would like to coordinate on is using this type of simulation map in the sPHENIX GEANT simulation to test if there is any impact on the resolution, tails, etc.    I assume that is a prerequisite to considering any modification of the fiber pattern since one would need a measurement metric to compare patterns.

Sincerely,

Jamie

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|| James L. Nagle   
|| Professor of Physics, University of Colorado, Boulder
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