sPHENIX HCal discussion

[Stefan Bathe <bathe AT bnl.gov>]

Hi Edward,

Yes, I think strongly that the fibers should be labeled.  We labeled them all 
here for the mock-up.  If Uniplast could label them, that would be terrific.  
I suggest the following labels:  0, 1, 2, 3, 4.  All fibers from the same 
pepper shaker would carry the same number.  That is, there would be five 
different kinds of pepper shaker-fiber assemblies, but the only difference 
between them would be their label number.
In addition to that, if Uniplast could separate out the two sub-bundles of 
each shaker-fiber assembly, that would be great.  A simple cable tie or piece 
of tape would be sufficient to accomplish this.  This way we wouldn't have to 
disentangle the sub-bundles when the assemblies get here.

Regards,
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
----------------------------------------------------------------------------------

> On Feb 14, 2019, at 9:07 PM, Edouard Kistenev <kistenev AT bnl.gov> wrote:
> 
> 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
>> 
>> Baruch:                                     BNL:
>> 17 Lexington Ave                      Bldg. 510
>> office 940                                  office 2-229
>> phone 646-660-6272                phone 631-344-8490
>> ----------------------------------------------------------------------------------
>> 
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