[FFA_CEBAF_Collab] beam properties

[Jay Benesch]

Colleagues,

Spurred by Stuart's question, I estimated beam size in the linacs 
assuming 100 m beta and the normalized emittances Alex showed at JLAAC. 
As seen in the attached, we have rarely gotten closer than a factor of 
two to design emittance.  Better in the last arc horizontal emittance, 
since SR dominates.  I think it prudent to assume root(beta*emittance) 
in the lattice a factor of two above design in non-dispersive regions 
and add appropriate term in dispersive regions.  The 12 GeV upgrade 
tried to maintain +-10*sigma clearance throughout, although there are 
places in extraction it fell a bit short.

Jay
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