High energy photon colliders (γγ,γe) are based on e-e-linear colliders where high energy photons are produced using Compton scattering of laser light on high energy electrons just before the interaction point. This paper is a part of the Technical Design Report of the linear collider TESLA.1Physics program, possible parameters and some technical aspects of the photon collider at TESLA are discussed.
The ILC Technical Design Report documents the design of a 500 GeV linear collider, but does not specify the centre-of-mass energy steps of operation for the collider. The ILC Parameters Joint Working Group has studied possible running scenarios and the evolution of physics outcomes based on a realistic estimate of the real time accumulation of integrated luminosity, including initial operations ramp-up and upgrades, constrained by a realistic power budget. These physics goals include Higgs precision measurements, top quark measurements and searches for new physics. We present this "optimized" operating scenario and the anticipated evolution of the precision of the ILC measurements.
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