Re: FCAL test

[Elke-Caroline Aschenauer <elke@jlab.org>]

On Thu, 13 Sep 2007, Richard Jones wrote:

Dear Richard and Beni,

what Richard suggest is nice, but I think as I wrote after the calo
meeting a problem related to the radiation hardness is how good can we
cure the crystals and do we come back after each curing to the same
crystal behavior/transparency.

Richard suggested a test in Connecticut at the machine of his university.
We could damage the crystals several time and cure than measure their
transparency. Richard I misplaced the mail you send me some time ago what
machine your university has.

I have also the following questions. how critical is the size of the
crystals, could we look in getting some radiation hard crystals from
Hermes just for the center of the fcal.

I think this is a problem we should address really soon.

bye bye elke


http://www.jlab.org/ccc/mail_archives/HALLD/halld-cal/msg00243.html


> Date: Thu, 13 Sep 2007 18:19:47 -0400
> From: Richard Jones <richard.t.jones@uconn.edu>
> To: Elton Smith <elton@jlab.org>
> Cc: beni zihlmann <bzihlman@indiana.edu>,
>      Matthew Shepherd <mashephe@indiana.edu>,
>      Alex Dzierba <dzierba@indiana.edu>,
>      Elke-Caroline Aschenauer <elke@jlab.org>, Elliott Wolin <wolin@jlab.org>,
>      George Lolos <George.Lolos@uregina.ca>,
>      Zisis Papandreou <zisis@uregina.ca>, David Lawrence <davidl@jlab.org>
> Subject: Re: FCAL test
>
> Beni,
>
> In addition to Elton's list, I would like to add the study of radiation
> damage.  The run should include some plan to increase the beam intensity
> for well-defined periods to quantify the rate of degradation and the
> effectiveness of various curing strategies.
>
> Richard Jones
>

 ( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
  )    `\                                                  -
 /    '. |                                                  +
 |       `,              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                              -
            +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+