Re: possible pair spectrometer magnets (fwd)

[whitey@jlab.org]

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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