Status of the TTF Cryogenic System

As part of the TESLA-Collaboration, components of a 1.8 K cryogenic plant, designed for testing superconducting RF cavities at the DESY laboratory, have been designed and built at the CEN SACLAY, LAL ORSAY, FERMLAB, INFN FRASCATI and DESY. Some additional components are being fabricated at IHEP PROTVINO and industry. The general layout of a 1.8 K Test Facility for the test of superconducting RF cavities has been described earlier1.