[FFA_CEBAF_Collab] septum for FFA

[Jay Benesch]

Colleagues,

Following my insight of October 7 of a way to reduce current density in 
the ZA septum I reduced the pole gap in the FFA septum design and found 
that the current density in the SC was just under half the original 
value.  I then explored the option of a water-cooled copper septum and 
found that the current density in the copper could be kept to a 
manageable level.  The table at the end of the attached provides the 
harmonic content of the three models on the same orbits.  It may be that 
a significant savings can be realized by using the copper model. The 
drift between the two magnets may also be reduced from 150 cm as there 
is no space needed for cryocoolers.  All of the variations will require 
interesting matching to the rest of the lattice.

Jay
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