[BTeam] yet another XH/XY spreadsheet

[Jay Benesch]

The spreadsheet attached has Fourier components calculated from 60 
points on 1 cm radius circles. Mesh between the pole faces is 0.25 cm 
quadratic aka 10 nodes per tetrahedron, so node spacing is about 0.1 cm. 
For three of the sets, at 900, 1050 and 1090 MeV/linac,  the orbit 
splits the sagitta as we normally do, with half on either side of the 
middle of pole face.  In the fourth case, done only for 1050 MeV/linac, 
the beam enters the steel near the middle of the pole face in the hope 
that getting it away from the corners at the ends would change things. 
See summary worksheet for comparison of Fourier components summed along 
the orbits.

The XH and XY poles are nearly identical except for 1.01" gap in the XH 
and 1.16" gap in the XY.  If you wish to compare them, pole drawings:

  XH - RECONFIGURED CORE
https://misportal.jlab.org/jlabDocs/docDownload/68451

XY - (new) CORE
https://misportal.jlab.org/jlabDocs/docDownload/43932

XY RECONFIGURED CORE WITH POLE SHIMS
https://misportal.jlab.org/jlabDocs/docDownload/72191

I don't know how to design a shim to deal with the XY multipoles.  The 
simplest routes I see are:

a. buy new poles for the three XY magnets with 1.01" gap and a separate 
power supply

b. design/build three magnets of same cross-section and turns count as 
the XH but 40" long vs 37.83", to get same BdL as existing XYs.

And, of course, put 0.063" carbon steel beam pipes for first pass 
through the trapezoidal BCOMs.

Jay
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