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Non-linear optics is employed with sextupole magnets for 1.2km/0.75TeV(beam
energy) collimator in order to selectively blow up the tail part of the beam.
The collimated beam profile is .For NLC, linear optics is employed for 2.4km/0.5TeV(beam energy) collimator.
The collimated beam profile is .Shorter collimation section is desired generally. New idea is welcome, and we
may expect exotic ideas such as laser, liquid metal-collimation(?).