Design, Manufacture and Test of the TESLA-TTF Cavity Cryostat

The aim of the TESLA Test Facility (TTF) is to build and to operate a superconducting (SC) linear accelerator accelerating electrons to an energy of approximately 450MeV, to establish the technological basis for a SC accelerating structure of competitive cost, that could reliably achieve accelerating field of about 15MV/m. Eight individual nine-cell, 1300Mhz superconducting cavities, their RF equipment, a superferric quadrupole doublet and dipole steering coils and all diagnostic elements are combined in a 12m long accelerator module, housed in a single cryostat. The TTF linac consists of four such modules. Cavities are cooled by superfluid two-phase Helium at 1.8K and the quadrupole windings at 4.5K.