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Re: FCAL test
On Sat, 15 Sep 2007, Richard Jones wrote:
Dear Richard,
thanks for reminding me. You are correct that is to low in energy to do
the tests I had in mind.
Cheers elke
> Date: Sat, 15 Sep 2007 16:26:42 -0400
> From: Richard Jones <richard.t.jones@uconn.edu>
> To: Elke-Caroline Aschenauer <elke@jlab.org>
> Cc: Elton Smith <elton@jlab.org>, beni zihlmann <bzihlman@indiana.edu>,
> Matthew Shepherd <mashephe@indiana.edu>,
> Alex Dzierba <dzierba@indiana.edu>, Elliott Wolin <wolin@jlab.org>,
> George Lolos <George.Lolos@uregina.ca>,
> Zisis Papandreou <zisis@uregina.ca>, David Lawrence <davidl@jlab.org>,
> halld-cal@jlab.org
> Subject: Re: FCAL test
>
> Elke and all,
>
> We have a van de graf 2.x MeV electron machine here at UConn that is
> capable of a few microamps of current. When we spoke about that, I was
> thinking of doing diamond crystal radiation damage tests with the van de
> graf just because the diamonds are so thin that any relativistic electron
> beam is equivalent. At 2 MeV the electrons would only penetrate a few mm
> into the lead glass, so it might not be as effective a way to learn about
> lead glass as it would be for diamonds.
>
> Richard Jones
>
> Elke-Caroline Aschenauer wrote:
>
> 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 -
> +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+
>
>
>
>
>
>
( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
) `\ -
/ '. | +
| `, 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 -
+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+