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The basic idea of the optical system, consisting of two
CCS(chromaticity-correction section with two identical sextupole magnets
connected by a pseudo-I transformer), the final "telescope" and matching
sections, is equivalent to that of the optics of FFTB.
The total length of final focus system is 1600 m per beam for a common beam
line at TeV except for the final doublets which must be
changed twice at least. The momentum acceptance is %,
and the total beam intensity in a bunch-train must be very stable within %.
If the system is optimized at =0.5 (1.5)TeV, the length is 500 (1100)
The above optimization should be discussed.