sPHENIX HCal discussion

[Stefan Bathe <bathe AT bnl.gov>]

Hi Edward and All,

Frank and I determined the fiber lengths for the outer HCal:

https://indico.bnl.gov/event/5718/contributions/26622/attachments/21788/30011/FiberLengths.pdf

The slides contain a table with the lengths:  one pepper shaker comes with 
one bundle of 25 fibers, separated into two sub-bundles of 12 fibers each 
(except for an additional spare fiber in one of the sub-bundles).  The two 
sub-bundles are identical in terms of fiber lengths (again, except for the 
additional spare fiber in one of them).  There are eleven different fiber 
lengths per bundle (so all but two of the fibers have different length; the 
spare fiber has the same length as the longest one).

The slides also contain a bunch of photos from the mock-up of an entire North 
half of one sector.  This is how we determined the fiber lengths.  So these 
lengths are not just calculated. The have been shown to work in practice.

Regards,
Frank and Stefan
-- 
---------------------------------------------------------------------------------
Stefan Bathe
Professor of Physics
Baruch College, CUNY

Baruch:                                     BNL:
17 Lexington Ave                      Bldg. 510
office 940                                  office 2-229
phone 646-660-6272                phone 631-344-8490
----------------------------------------------------------------------------------