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magnet spec



Hello Yang
I checked again with my field maps and I seem to be getting that we need 
to go 77mm in from the
EFB to reach 3 parts in 10^4 . I use abs(B_mod-B_central/B_central) 
<.0003 for the criteria. This would
imply the 1cm clearance for the beam is probably what we want.

Let me know if this agrees with your calculations.
Cheers
Jim

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