sPHENIX HCal discussion

[Edouard Kistenev <kistenev AT bnl.gov>]

Hi, Stefan and Frank, well done both fibers and the rest of the mockup. Will 
not say I am happy to be the one to tell our vendor that all fibers are 
different - but it can be done. I see one problem - you probably want to see 
all fibers labelled - this will not be easy afterwards. Decide and let’s 
discuss if anything else is worth considering. 
Edward

Sent from my iPhone

> On Feb 14, 2019, at 4:36 PM, Stefan Bathe <bathe AT bnl.gov> wrote:
> 
> 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
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