Re: More on BCAL segmentation

[Elton Smith <elton@jlab.org>]

HI George,

I agree that dynamic range needs to be considered. Zisis already pointed
this out during a previous meeting when you were absent.

Cheers, Elton.


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

On Mon, 18 Aug 2008, George Lolos wrote:

> Hi Elton:
>
> The exercise on the effects of segmentation on timing resolution was an
> interesting feedback.  Coupled with the momentum resolution simulations,
> one has to question the fine segmentation we have been pursuing so far.
> However, one aspect that has not been considered in any simulation so
> far is the effect of non-linearity that we may get with coarser
> segmentation.  We have already seen such an effect after the Hall-B beam
> tests, when we have 4.5% non-linearity with a photon dynamic range of
> only a factor of three or so.  KLOE also has shown non-linearity in
> their papers.  If we use PMT's and drive them hard to collect a low
> number of photoelectrons from MIP's at large angles and at the same time
> we may have the case where a couple of hundred of photoelectrons are
> read out by the same PMT for higher energy photons at small angles.
> Linearity will suffer.  I think this effect should be considered as well
> to be bale to reach a better picture.
>
> Cheers,
>
> George
>