Re: [GlueX] Hall-B beamtest

[Elton Smith <elton@jlab.org>]

HI Rafael,

Thanks for the addition. It looks like the curve has a slope even at the
center, perhaps implying that we in fact do have sensitivity even to the
smallest change in the the beam position. However the amount of leakage is
very small, so I assume that the resolution is not much affected. Do you
have a plot of the resolution as a function of the beam position?

Cheers, Elton.



Elton Smith
Jefferson Lab
elton@jlab.org
(757) 269-7625

On Tue, 18 Jul 2006, Rafael Hakobyan wrote:

> Hi Elton,
>
> In the plots that have been presented today, I have added the points
> corresponding to the percentage of the energy leakage (WRT the incident
> photon energy) when the photon beam enters the BCAL from the centre.
> Please find the improved plots on the web site
>                        http://www.jlab.org/~rafael/Beamtest/misalignment/
> Thanks for the relevant comment.
> Rafael
>
> Rafael Hakobyan wrote:
>
> > Hi All,
> >
> > Please find some more simulation results on the web site
> >                   http://www.jlab.org/~rafael/Beamtest/
> > Two more links are added, namely
> >   a). shower energy leakage from the BCal module when the beam is
> > misaligned
> >         from the BCal centre
> >   b). distribution of the Up and Down time difference for the
> > collimated (2.6mm)
> >          beam and for the pencil beam
> > about which Zisis and I want to discuss with you during today's
> > teleconference.
> >
> > Time always has been calculated in two ways: taking the energy
> > weighted time and  the very first
> > photon time. Our investigations always show that the sigma is smaller
> > for the energy weighted
> > time. From the beging for the calculation of the time, I have had very
> > useful and productive discussions
> > with Richard Jones about the energy weighted time, and I want to
> > express my thankfulness  to Richard for  the  useful discussions.
> >
> > Cheers,
> > Rafael
> >
> >
> >
>
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