Re: possible pair spectrometer magnets (fwd)

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

On Mon, 2 Jun 2008, Richard Jones wrote:

Dear Richard and Jim,

actually, I think before we ask  rebecca tim might be the correct person
to ask as currently the idea is to have the magnet partially integrated in
the wall between the collimator cave and hall d.

cheers elke


> Date: Mon, 02 Jun 2008 17:13:04 -0400
> From: Richard Jones <richard.t.jones@uconn.edu>
> To: Jim Stewart <jstewart@jlab.org>
> Cc: Hall D beam working group <halld-tagger@jlab.org>
> Subject: Re: possible pair spectrometer magnets (fwd)
>
> Jim Stewart wrote:
> > Dear tagger
> >
> > While at BNL I went looking for possible magnets for the pair
> > spectrometer. I found several which look like good candidates.
> >
> > The 20x42 looks to be very interesting. It is a C-Magnet with the
> > following characteristics:
> >  pole width  508mm
> >  pole gap    203mm
> >  pole length 1067mm
> >  Max field   1.85T
> >
> > The gap is too large but it would be easy to add plates to the poles to
> > reduce this. A C-Magnet has the advantage that on one side of the magnet
> > we can measure very low momentum particles. Installing the vacuum chamber
> > can also be done without taking the magnet apart.
> >
> I agree that this magnet looks interesting.  One thing comes to mind,
> though.  When we gave our total floor load to civil, we did not have
> something of this magnitude in the plan.  It might be worth a trip over
> to the civil engineer's office and toss out a number like 27 additional
> tons and see what they say.
>
> Richard Jones
>

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