No Subject

[Elton Smith <elton@jlab.org>]

Hi Alex,

Thanks for putting together all the information on the fiber spectra and
photoelectrons. The one key parameter that should be able to be derived
from this is the number of photons/GeV (Eq. 2 in GlueX-doc-795). The old
original number was 84000, but based on recent information we revised the
calculations using four times less photons. The photon yield directly
affects our specification for the PDE of SiPMs, which is now under
discussion for a statment of work with further SiPM development.

Based on your calculations, it would be useful to estimate the Npe/GeV for
various configurations: the two Bcal prototypes and the best estimate for
a production green fiber (this latter value would drive our design
specifications).

Thanks, Elton.


--------------------------------
Dear Colleagues

During the past six days I have been visiting U of Regina where
George, Zisis and I worked on issues related to the introduction
and calorimeter sections of the CDR for CD-3.  We also co-authored
a GlueX-doc-924-v1 (just posted) on an analysis of fiber emission spectra.

Cheers
Alex
-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Alex R. Dzierba
Chancellor's Professor of Physics (Emeritus)
Department of Physics / Indiana U / Bloomington IN 47405 / 812-855-9421
JLab Visiting Fellow
Jefferson Lab / 12000 Jefferson Ave / Newport News, VA 23606 /
757-269-7577
Home Phone: 812-825-4063  Cell:  812-327-1881  Fax: 866-541-1263
http://dustbunny.physics.indiana.edu/~dzierba/