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Re: light collection in bcal outer layers
On Wed, 23 Jan 2008, Christina Kourkoumeli wrote:
Christine,
one of the open issue with the BCal is to optimize the segmentation of the
outer bcal. this will make the use of the expensive hamamatsu pmts meybe
more likely. We have to definetely look to it ones more and optimize it.
cheers elke
> Date: Wed, 23 Jan 2008 18:37:04 +0200 (EET)
> From: Christina Kourkoumeli <hkourkou@phys.uoa.gr>
> To: George Lolos <George.Lolos@uregina.ca>, elton@jlab.org,
> halld-cal@jlab.org
> Subject: Re: light collection in bcal outer layers
>
> Dear Elton,
> I also read your note and I find it useful -for once more-to advocate for
> the use of Field resistant PM's.The light guides will be much shorter, we
> will avoid the use of sharp angles and the cost of mirrors. I do not know
> the price of 3" but the aditional cost+high quality mirrors+etc may pay
> part of the additional field resistant cost.It would be very interesting
> to have at least this information concerning the loss of photons.
> Cheers,Christine
> pS.I also think that given your segmentation+low efficiency you will loose
> the few photons produced in most cases.
>
> >
>
>
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