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The S-band Linear Collider Test Facility

The S-Band Linear Collider Test Facility under construction at DESY will serve as a unique test bed for the necessary technical developments of a large scale 2/spl times/250 GeV e/sup +/e/sup -/ linear accelerator. The test facility consists of two modular units similar to those to be installed in a Linear Collider tunnel. The questions of Higher Order Mode excitation, measurement, damping and feedback on the accelerating cavity and the quadrupole position are especially important and have to be addressed in order to understand the most crucial aspect of a 15 km linear accelerator namely the beam stability. Simultaneously the performance of the newly developed rf-systems is investigated. The status of this set-up is presented.