Re: possible pair spectrometer magnets (fwd)

[Tim Whitlatch <whitey@jlab.org>]

Hi Sascha,

 Will the permanent magnet be between toe collimators or downstream of both?

Tim

Alexander Somov wrote:

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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