sPHENIX HCal discussion

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

Hello Edward (cc sphenix-hcal-l list and Shawn, Sebastian, Sebastian),

We just received the shipment of HCal scintillator tiles at the University of Colorado today!     In the attached slides we have cataloged the different panels by the markings on the plastic cover and the visible coating patterns.   We do not want to remove the wrapping under the plastic cover on some of the tiles before learning more.

A full scan with detailed resolution will probably take about one-day per tile.     Additionally, all tiles in the past have had the fibers extending beyond the end and that is where we coupled the SiPM to the fiber.  On all of these panels the fibers are cut flush to the scintillator end, and it is not so clear they are polished.    We can put together a coupling device, though are concerned that the optical grease we have been using is known (by our experience) to eat away at the white coating (the exact material properties we are not aware of).    A quick answer to this question would be great to get a first test underway.

It would be great if we can set up a separate meeting or part of the larger HCal meeting, to go through the optimal testing of these tiles.    For example, we can easily run with a two SiPM coincidence on the ends of one fiber as long as we can use optical grease, and are unclear on the 4 fibers purpose in each tile.

Sincerely,

Jamie (for Shawn, Sebastian, and Sebastian)

 

||--------------------------------------------------------------------------------
|| James L. Nagle   
|| Professor of Physics, University of Colorado, Boulder
|| EMAIL:   jamie.nagle AT colorado.edu
|| SKYPE:  jamie-nagle        
|| WEB:      http://spot.colorado.edu/~naglej 
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Attachment: Scintillator Panel Catalog 05-11-15.pdf
Description: Adobe PDF document