[Halld-cal] Draft of BCAL constants document

[Sean Dobbs]

Hi Elton,

Thank you for this very nice summary. I am free any time on Friday.

---Sean

On Wednesday, December 10, 2014, Elton Smith <elton at jlab.org> wrote:

> Dear colleagues,
>
> I have uploaded a draft document (GlueX-doc-2618) with definitions for
> the low-level calibration constants for the BCAL. This is a document for
> discussion and feedback is welcome. The goal, after we have hashed it
> out, is to have precise definitions of all constants that are placed in
> the calibrations data base. In particular, it is necessary to choose
> some conventions, which need to be clear to avoid errors in
> reconstruction. We need to agree on what those conventions are. We
> should also make sure that there are no factors of 2 missing.
>
> The document proposes that the gains be specified at the center of the
> module.  If I understand correctly, this is different than Andrei's
> convention that uses the end of the module.
> Therefore, there is a factor of e^{-L/2*lambda} between the two that
> needs to be sorted out. There may also be other definitions or
> conventions that need consensus.
>
> We should probably find a dedicated time to go over this. As we are in
> the process of entering constants into db now, I would hope to have a
> discussion soon. Is Friday a possibility?
>
> Thanks, Elton.
>
>
> --
> Elton Smith
> Jefferson Lab MS 12H3
> 12000 Jefferson Ave STE 4
> Newport News, VA 23606
> (757) 269-7625
> (757) 269-6331 fax
>
>

-- 
Sean Dobbs
Department of Physics & Astronomy
Northwestern University
phone: 847-467-2826
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