[Halld-cal] Notes on Cabling and labeling of Fcal and Bcal

[Elton Smith]

Dear collaborators,

I had promised to send out a summary of my understanding of the labeling 
for Bcal and Fcal detectors. Fernando's 1 page summary is attached and 
gives the previously agreed labeling scheme for both detectors.

The motivation and discussion of cabling related to the trigger can be 
found on an archived e-mail
http://www.jlab.org/ccc/mail_archives/HALLD/halld-cal/msg00795.html . 
Note that the numbers for the Bcal must be reduced by the granularity of 
the Bcal sums (see below), but the strategy remains the same.

The numerology for the Bcal is given in the lists below for the current 
nominal configuration and how they would change if an additional inner 
layer is added. For the FADCs, one might be able to get away without 
adding any more crates, but the crates would be completely filled if the 
additional layer is added. For the TDCs, I think would need to add two 
crates (one on each side of the beamline), although the crates would 
only be a little over half full.

Given that the cabling into the electronics depends on the trigger, 
which has not yet been completely defined, and the uncertainly on 
whether an additional layer would be added, I do not think we can 
specify completely the electronic assignment of each detector element at 
this time. Therefore, I suggest that for the moment we label the cables 
with their detector labeling only.

Cheers, Elton.


-----------------------------------------------
Nominal configuration

FADCs (16 inputs)
Outputs per Bcal                         2x12
Number of slots per crate used       12
Number of Bcal mods per crate         8
Number of crates north                     3
Number of crate south                      3

TDCs (32 inputs)
Outputs per Bcal                           2x8
Number of slots per crate used       12
Number of Bcal mods per crate       24
Number of crates north                     1
Number of crates south                     1

Adding one radial layer

FADCs (16 inputs)
Outputs per Bcal                         2x16
Number of slots per crate used       16
Number of Bcal mods per crate         8
Number of crates north                     3
Number of crate south                      3

TDCs (32 inputs)
Outputs per Bcal                         2x12
Number of slots per crate used         9 (over half full)
Number of Bcal mods per crate       12
Number of crates north                    2
Number of crates south                    2

Cheers, Elton.


Elton Smith
Jefferson Lab MS 12H5
12000 Jefferson Ave
Suite # 16
Newport News, VA 23606
elton at jlab.org
(757) 269-7625
(757) 269-6331 fax

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