A Permanent Magnet Wiggler Design for the TESLA Damping Ring

The TESLA Linear Collider requires damping rings equipped with long wigglers in order to reduce the beam emittance before the particles are injected into the main linac. We propose a compact permanent magnet wiggler which will be installed in the straight sections of the damping ring. The concept discusses the magnetic design and field distribution; a damping integral ID ~ 1.37 T m per meter wiggler is reached which would correspond to a 475 m long device. Other aspects like characteristics of the synchrotron radiation power or possible radiation damage of the magnets are worked out to an extent that allows comparison to an alternative electromagnetic version of the damping wiggler which is investigated in parallel. Costs have been estimated for the mass production of the magnet structure.