Re: possible pair spectrometer magnets (fwd)

[Alexander Somov <somov@jlab.org>]

Hello Tim,

I am checking background in the collimator
cave now and also studying feasibility of
using a single constant sweeping magnet, which
is about 3.5 m long (this magnet exists in the
JLAB). If this configuration works, we might
consider to modify the design in the future.

The pair spectrometer will need a bit more space
(besides the magnet) for scint. counters and subsequent
shielding.


Cheers,
       Sascha




On Tue, 3 Jun 2008 whitey@jlab.org wrote:

> Good Morning all,
>
> We are looking at putting the magnet at least partially in the collimator
> cave. With previous conversations with civil, it seems there is plenty of
> capacity in the collimator cave floor. I will verify this and also shift
> the secondary collimator upstream (as well as subsequent shielding) to
> accomodate a 1 M magnet.
>
> Cheers,
>        Tim
>
>
> > 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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