sPHENIX EMCal discussion

[Edward Kistenev <kistenev AT bnl.gov>]

Hi, Michael, Good work. I have couple questions which are hopefully easy to answer. They are all of if-what nature.

- total light yield per unit of detector surface comparison (you need something else not just the nonuniformity) as an estimator to base your conclusions;

-  Is it possible to replace specular with diffuse reflection on sides of light guide (one per SiPM);

- will it help to go from one large to multiple small light guides;

- will it help using fresnel lenses at the base of small light guides;

- will it help modifying the shape of small light guides (winston shaped  cones instead of flat sided cones).

There can be more options.

Edward

On May 31, 2016, at 3:13 AM, Phipps, Michael William <mphipps2 AT illinois.edu> wrote:

Hi all,

Following up on the EMCal segmentation discussion from last week, we've done a series of geant simulations to test the lightguide uniformity/efficiency at different segmentation configurations (0.024 x 0.024; 0.033 x 0.028; 0.034 x 0.034). The results are attached below.

For those I haven't discussed this with before, we did this by scanning up and down the base of the lightguide with 1,000, 2.75 eV photons at each position -- distributed according to the exit characteristics of the scintillating fibers. The sipms are simulated by a series of scoring volumes at the end of the lightguide with the efficiency defined as the % events reaching the scoring volumes. The uniformity is the width of the efficiency distribution from each point along the scan. 

Best, 

Mike


 

<Geant4 Study of Lightguide Efficiency_Uniformity.pptx>_______________________________________________
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