sPHENIX HCal discussion

[John Lajoie <lajoie AT iastate.edu>]

Dear HCAL'ers:

    In the HCAL meeting today we had a discussion of the assembly of the inner HCAL for the test beam, the testing of the tiles, and whether or not it would be valuable to try to match cosmics response of the HCAL tiles within a tower.  In principle this should be a "good thing", and I would imagine that if there is a large variation between the tiles in a tower that could contribute to the constant term in the energy resolution.

    Doing this would require mating the scintillators with their SiPM's followed by cosmics testing to mix-and-match the scintillators before they are installed. It's my understanding that at BNL they will be ready to start installing scintillator soon, so if we want to do this then we need to get organized quickly.  Of course, we would only be doing this for the inner HCAL as the outer HCAL is the same as last year.  I think I would be assassinated if I suggested we disassemble the outer HCAL and match the tiles.

    In past test beams the variation within a tower was not carefully controlled, so if we did this it would be a good way to test the effect on the energy resolution. However, if we only do it for the inner HCAL it is likely of limited utility.

    Comments? Suggestions?

Regards,
John Lajoie

John Lajoie

Professor of Physics

Iowa State University

 

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