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The
collimation system of the Compact Linear Collider (CLIC) must fulfil a number of
conflicting requirements, namely it should (1) remove beam halo to reduce the
detector background, (2) provide a minimum distance between collimators and
collision point for muon suppression, (3) ensure collimator survival and machine
protection against errand beam pulses, (4) not be excessively long, and (5) not
amplify incoming trajectory fluctuations via the collimator wake fields. Two
optical systems have been designed — the first linear, the second non-linear
—, which promise to meet all these requirements for the design beam energy of
1.5 TeV. We describe the various design criteria, a preliminary performance
assessment, and outstanding questions.
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