[Bteam] BA multipoles with and without H steel

[Jay Benesch]

I created a BAH model with 2" H steel.  I meshed it two ways for the 
purposes of this email: once with the H steel as steel and once with it 
turned to air.  This keeps the meshes as close to identical as possible. 
  I ran it with current densities at 50A/cm^2 intervals except near 6 
and 11 GeV max currents.  Current = 1.265*J.

The spreadsheet attached has multipoles on the arc 8 orbit through the 
BA with and without H steel.  J=200 A/cm^2 gives a BdL 3.2% higher than 
the nominal in arc 8 with Qweak linac energy 549 MeV.  What I am 
attempting to model here is what we'll see in arc 8 after the six month 
down.  Bottom line: less quadrupole and octopole.  Quadrupole term is 
NOT corrected for geometric effects of the calculation method. See 
http://www.jlab.org/technotes/2008/08-064.pdf

Columns R-Z have the summed results.  In rows 19-50 I copied from 
another spreadsheet with the straight line BdL info, integrated 0-200cm 
and doubled.  Column V suggests saturation levels.  430 A/cm^2 is the 
current density for the A line at 11 GeV.

I'll be able to fill in the two blank lines (31 and 33) next week.  The 
models take 3.5 days to run and I'm running only one in background so I 
can do other modeling and evaluation in the foreground without crashing 
OPERA.

Jay
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