From: Marc Dejardin [marc.dejardin@cern.ch]
Sent: 11 March 2009 09:50
To: Adolf Bornheim
Cc: Giovanni Franzoni; Tommaso Tabarelli de Fatis; Federico Ferri;
MALCLES Julie; Rachel Yohay; Alexander Ledovskoy; Toyoko Jennifer
Orimoto; Evgueni Vlassov; Jan Veverka; Cockerill, DJA (David); Hamel de
Monchenault Gautier
Subject: Re: EE diffusing spheres

Attachments: Numbering_EE_All_Data.txt

Adolf Bornheim a écrit :
> 
>  Dear all,
> 
>   as we know the EE light distribution is
>   significantly less regular than the one
>   in the EB.
>   It would be convenient to have common code
>   to make a link between a channel in EE
>   and which diffusing sphere it belongs to.
>   Is there a way to deduce the sphere
>   from other numberings - tower, token
>   ring, trigger (??) - wasn't there complicated
>   reasoning as to why the channels are
>   assigned to spheres.
>   Or do we need to go by a lookup table ?
> 
>   Cheers,
> 
>   Adi
Hello Adi,
The situation could have been simple, since the mounting has been done upon geometrical considerations
(finite length of the fibers and assembly modularity was SC) but "simple"is not a CMS word.
As you know, there are some partial SC in corners (?) of Dees and these partial SC have been grouped to
form more or less complete R/O units.
You can imagine that these R/O units are obviously across several diffusing spheres.
The the 1-to-1 correspondence between SC and diffusing spheres is no more possible.

The solution is a LUT. I have build one of these for my personal tests... I put it in attachment, 
but the best would be to take what Gautier has put is MUSECAL and which should be somewhere in CVS of CMSSW.

In this file, PN number 1xx corresponds to PN xx of DCC with lower number and 2xx to PN xx of DCC
of higher number. PNs are read by 2 DCCs in each Dee :
Dee1 : 650, 651
Dee2 : 646, 647
Dee3 : 601, 602
Dee4 : 605, 606

PNA and PNB are the present PN numbers
THA and THB are the theoretical numbers if cabling had been done correctly, and will be the real 
numbers after cabling corrections (fortunately next week).

Cheers,
Marc