sPHENIX discussion of software

[John Haggerty <haggerty AT bnl.gov>]

Chris et al.,

Now that all the hard work by you and others on putting a realistic 
EMCAL and HCAL geometry is being finalized, it's probably time to add a 
little more realism to the magnet model.

I huddled with Richie and Jim this afternoon, and I think a slightly 
better model than the 1*X_0 of Al plunked down in the middle of the 
cryostat that I originally suggested would be 3 concentric annular 
cylinders of Al--the two walls of the cryostat and the coil and mandrel. 
 The alloy is 5083 Al, which is about 5% Mg and the rest almost pure 
Al.  The actual geometry is somewhat more complicated than that, but I 
think this is a good (and easy) next approximation.  I *think* this 
captures most of the material, and it adds up to about 1.4*X_0.

Here are the dimensions that we have from the as-built drawings... 
hopefully there is no collision with dimensions you have for the HCAL.

                    Inner radius  Thickness  Length
                    mm            mm         mm
Cryostat inner wall 1420          10.0       3790
Coil and bobbin     1508          93.8       3615
Cryostat outer wall 1745          25.0       3790

--
John Haggerty
email: haggerty AT bnl.gov
cell: 631 741 3358