Results from the DESY TESLA test facility

The TESLA Test Facility (TTF), under construction at DESY by an international collaboration, is an R&D test bed for the superconducting option for future linear e/sup +//e/sup -/ colliders. It consists of an infrastructure to process and test the cavities and of a 390 MeV linac. The infrastructure has been installed and is fully operational. It includes a complex of clean rooms, an ultraclean water plant, a chemical etching installation and a ultra-high vacuum furnace. The linac will consist of three cryomodules, each containing eight nine-cell cavities operated at 1.3 GHz. The accelerating gradient should be of at least 15 MV/m, with a Q of 3/spl times/10/sup 9/. The injector delivers a beam of 10-15 MeV, it has been installed and commissioned. The first module is in place, a 140 MeV beam is expected in June 97. An overview of the facility and results of the tests are given in this paper.