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Re: fcal radiation hardness



On Mon, 6 Aug 2007, Matthew Shepherd wrote:

Hi Hi,

but I really think we need a concept before we can discuss a realisation
with Tim. I also think we should revisit the impact once more critical. We
had lately quite some suprises in the design of the detector.

cheers elke


> Date: Mon, 6 Aug 2007 08:34:19 -0400
> From: Matthew Shepherd <mashephe@indiana.edu>
> To: Elke-Caroline Aschenauer <elke@jlab.org>
> Cc: halld-cal@jlab.org, Timothy Whitlatch <whitey@jlab.org>
> Subject: Re: fcal radiation hardness
>
>
> Hi Elke,
>
> Yes, this is something we talked about with Tim, but did not bring up
> in the workshop.  It is on our list of things to try to understand.
>
> -Matt
>
> On Aug 6, 2007, at 2:44 AM, Elke-Caroline Aschenauer wrote:
>
> >
> > Dear Matt and Beni,
> >
> > I think we overlooked an important point during the calorimeter
> > meeting
> > what needs to be finalized for a review.
> > I think we need a clear plan how to deal wit the radiation hardness
> > problem of the inner block of the fcal.
> >
> > We can either develop an insitu cure for the radiation damage of the
> > blocks. UV-light only cures part of the problem and insitu heating
> > seems
> > not really practically. The other option would be to use radiation
> > hard
> > blocks, if we don't find the money to buy them maybe we can find
> > blocks
> > somewhere. Like CMS spare blocks or fermi or ....
> >
> > I think we need a strategy to attack this problem. I think it would
> > also
> > be good to look again how long we can run till we see really damage
> > and
> > light losses.
> >
> > bye elke
> >
> >
> >
> >  ( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
> >   )    `\                                                  -
> >  /    '. |                                                  +
> >  |       `,              Elke-Caroline Aschenauer            =
> >   \,_  `-/                                                    -
> >   ,&&&&&V         Jefferson Lab                                +
> >  ,&&&&&&&&:       HALL-D 12C / F381       121-A Atlantic Avenue =
> > ,&&&&&&&&&&;      Mailstop: 12H5          Hampton, VA 23664      -
> > |  |&&&&&&&;\     12000 Jefferson Ave                             +
> > |  |       :_) _  Newport News, VA 23606  Tel.:  001-757-224-1216  =
> > |  |       ;--' | Mail:  elke@jlab.org    Mobil: 001-757-256-5224   -
> > '--'   `-.--.   |                                                    +
> >    _    |  |---' Tel.:  001-757-269-5352                             =
> >      `-.___/     Fax.:
> > 001-757-269-6248                              -
> >             +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-
> > +=-+=-+
> >
>
>

 ( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
  )    `\                                                  -
 /    '. |                                                  +
 |       `,              Elke-Caroline Aschenauer            =
  \,_  `-/                                                    -
  ,&&&&&V         Jefferson Lab                                +
 ,&&&&&&&&:       HALL-D 12C / F381       121-A Atlantic Avenue =
,&&&&&&&&&&;      Mailstop: 12H5          Hampton, VA 23664      -
|  |&&&&&&&;\     12000 Jefferson Ave                             +
|  |       :_) _  Newport News, VA 23606  Tel.:  001-757-224-1216  =
|  |       ;--' | Mail:  elke@jlab.org    Mobil: 001-757-256-5224   -
'--'   `-.--.   |                                                    +
   \_    |  |---' Tel.:  001-757-269-5352                             =
     `-._\__/     Fax.:  001-757-269-6248                              -
            +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+