Re: Readout crates in counting house? (fwd)

[Elton Smith <elton@jlab.org>]

---------- Forwarded message ----------
Date: Tue, 2 May 2000 14:28:42 -0400
From: Fernando J. Barbosa <barbosa@jlab.org>
To: Elton Smith <elton@jlab.org>
Subject: Re: Readout crates in counting house? (fwd)

Elton, given the end result in CLAS, with close to 100 ft. of cable running
analog signals from the preamps to the ADB crates, I would strongly argue
against long cable runs for signal quality, cost and routing space. Very
careful consideration is a must before settling on a confortable design
criteria and a lot of details are still not available at this juncture. Best
regards,

Fernando J. Barbosa
Jefferson Lab,
Physics Div., MS 12H
12000 Jefferson Ave.
Newport News,  VA 23606

Phone: 757-269-7433
Fax:  757-269-5800
Email: barbosa@jlab.org
----- Original Message -----
From: Elton Smith <elton@jlab.org>
To: Eric Scott <eric@dustbunny.physics.indiana.edu>
Cc: <halld-jlab@jlab.org>
Sent: Monday, May 01, 2000 4:27 PM
Subject: Readout crates in counting house? (fwd)


>
> ---------- Forwarded message ----------
> Date: Mon, 01 May 2000 12:39:28 -0400
> From: Elliott Wolin <wolin@jlab.org>
> To: Paul Smith <ptsmith@indiana.edu>
> Cc: Elliott Wolin <wolin@jlab.org>, Randy McCleod <rwm@jlab.org>,
>      Elton Smith <elton@jlab.org>, Dennis Weygand <weygand@jlab.org>
> Subject: Readout crates in counting house?
>
> Hi Paul,
>
> The location of the readout crates affects the Hall D building and
counting
> house layout and design.
>
> I think it's possible to have ALL the crates IN the counting house, or at
least
> outside of the radiation area.  Driving cables from near-detector preamps
50-80
> feet to the digitizing crates is no big deal, and 50-80 feet is long
enough to
> get outside the radiation area.  Same for HV, etc.  Careful cable routing
is
> needed, as usual.
>
> Do you know of any reason not to do this?  Even if some system needed the
crates
> as close as possible to the detector, the remainder could be in the
counting
> house.
>
> Anyone who has struggled with commisioning crates in a radiation area
(CLAS,
> RadPhi, etc.) knows why I want to do this...
>
>
> Sincerely,
> Elliott
>
>
>
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