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

[Matthew Shepherd]

The linked email is not accessible.

-Matt

On Jul 19, 2011, at 8:29 PM, Elton Smith wrote:

> 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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