The Cryogenic System of TESLA

TESLA, a 33 km long 500 GeV centre-of-mass energy superconducting linear collider (upgradeable to 800 GeV) with an integrated X-ray FEL facility of 0.1 nm wave length, has been proposed by an international collaboration to be built at DESY. The backbone of this collider are more than 21000 superconducting 9-cell RF cavities, operated at 1.3 GHz with 5 Hz beam repetition rate, and about 800 superconducting magnet packages with quadrupoles and steering dipoles. The paper gives an overview of the cryogenic system necessary to cool these elements to 2 K. The system mainly consists of about 1800 cryomodules assembled in twelve 2.5 km long cryogenic units, supplied from 7 refrigerators