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.

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We discuss the pair production of charginos in collisions of polarized photons γγ → χ+ i χ− i , (i = 1, 2) and the subsequent leptonic decay of the lighter chargino χ+ 1 → χ0 1 e + νe including the complete spin correlations. Analytical formulae are given for the polarization and the spin-spin correlations of the charginos. Since the production is a pure QED process the decay dynamics can be studied separately. For high energy photons from Compton backscattering of polarized laser pulses off polarized electron beams numerical results are presented for the cross section, the angular distribution and the forward-backward asymmetry of the decay positron. Finally we study the dependence on the gaugino mass parameter M1 and on the sneutrino mass for a gaugino-like MSSM scenario.

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We study the associated production of selectrons and neutralinos with subsequent leptonic decay of the selectron in eγ scattering within the framework of MSSM and NMSSM. Due to the weak couplings of singlino dominated neutralinos, associated neutralino production e + e − →χ 0

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We investigate pair production of selectrons in e − e − scattering with subsequent decay into an electron and the LSP including ISR and beamstrahlung. This process can be used at a linear collider to measure the selectron masses and the gaugino mass parameter M 1 very precisely.