sPHENIX EMCal discussion

[Gabor David <david AT bnl.gov>]

On Fri, 26 Feb 2016, Lajoie, John G [PHYSA] wrote:

        Hi, John,

> Hi Vera,
>
>     Very nice plot!
>
>     The THP points in particular had me wondering if there is a limit to the
> variation of the density that you can tolerate?  I would expect that a
> module-to-module variation in the density (of the absorber) would lead to a
> variation in the effective sampling fraction, which could degrade the
> effective energy resolution.  I suppose if you knew the density of each
> module you could make a correction?

        wild guess: yes, and two different ways.
        1/ have the same density in each module in the simulation,
but at the end correct the visible signal in each tower (such a
"calibration of the simulation output" is not unheard of, actually
in some sense we are doing it even now)
        2/ get different densities for different modules in GEANT4
(just kidding; nightmare!)

        Maybe a first good question to ask would be to compare
the simulated response in two modules with densities corresponding
to the two ends of the current density distribution.

        2 cents :-)

        Gabor

> John
>
> On 2/26/2016 4:24 PM, Loggins, Vera wrote:
>       Hi all,
> I just wanted to share the density plot vs. module number that we have
> at UIUC.  I have plotted this along with THP's numbers.
>
> Have a good weekend,
> Vera
>
>
> --
>
> John Lajoie
>
> Professor of Physics
>
> Iowa State University
>
>  
>
> (515) 294-6952
>
> lajoie AT iastate.edu
>
> Facebook LinkedIn
> Contact me: Skype john.lajoie

--
Gabor David  (david AT bnl.gov)
Brookhaven National Laboratory
Physics Department, Bldg 510/c
UPTON NY 11973
Tel: (631)344-3016
FAX: (631)344-3253