sPHENIX discussion of the superconducting solenoid

[John Haggerty <haggerty AT bnl.gov>]

-------- Forwarded Message --------
Subject: Babar coil without end caps
Date: Thu, 26 Mar 2015 18:30:13 +0100
From: fabbric <Pasquale.Fabbricatore AT ge.infn.it>
To: John Haggerty <haggerty AT bnl.gov>, Yip, Kin <kinyip AT bnl.gov>
CC: Mills, James A <mills AT bnl.gov>, Than, Yatming (Roberto) <ythan AT bnl.gov>

Hi all.

I did a fast computation with Comsol removing the
end caps (indeed I put to 1 the magnetic  permeability).

At the same current the central magnetic field is reduced from 1.5 T
to 1.37 T and it is more inhomogeneous.
The peak field on the conductor seems to
be a bit higher  and placed at the coil
axial ends (so the current cannot be increased
or we have a reduced stability margin).
The axial compression increases of 85%
(i.e. a bit less than double).

My first impression is that this solution could be considered
if you can accept a reduced magnetic field.

Best regards

Pasquale

--
Dr. Pasquale Fabbricatore
INFN Sezione di Genova
via Dodecaneso 33, 16146 Genova Italy
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--
John Haggerty
email: haggerty AT bnl.gov
cell: 631 741 3358

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