Abstract :
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We describe a base-line optics for a 3-TeV CLIC
final-focus system. The proposed system consists
of an initial beta matching region, two chromatic
correction sections, and a final transformer, and
it provides a total demagnification by a factor 90
horizontally and 346 vertically. The length per
side amounts to 3.3 km. The effect of synchrotron
radiation and higher-order aberrations is
minimised by an odd dispersion function in the
chromatic correction section. For a total flat
energy spread of 1%, the system promises a
luminosity of about 80% of the ideal. The 20-30%
spot-size dilutions in the two transverse planes
reflect a trade off between Oide effect and
higher-order chromo-geometric aberrations.
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