Accelerator aspects of photon colliders at TESLA

Abstract

The TESLA linear collider is being primarily designed as a 500– 800 GeV centre of mass e +e − linear collider. However, a second interaction region is being incorporated into the design with a crossing angle of 32 mrad , which is suitable for use as a γγ collider. In this paper we will review those aspects of the current machine design which are critical to the operation of TESLA as a photon collider, paying particular attention to the preservation of small horizontal emittances, and—in the absence of beamstrahlung—limits on reduced horizontal beam cross-section at the interaction point.