Cryogenic Testing of Hera Superconducting Magnets

Abstract

The HERA proton storage ring will contain 422 superconducting dipole magnets and 224 superconducting quadrupole magnets. Each of these superconducting magnets will be connected at the Magnet Measurement Facility and individually tested before being installed in the 6-km ring tunnel. This paper discusses the cryogenic experience at the Measurement Facility during the various phases of the magnet tests. The computer-automated cool-down procedure used for thermal cycling of the magnets is described. The behavior of the cryogenic system for dipole and quadrupole magnets during quench and quench recovery is discussed. The results of cryogenic tests performed on the first superconducting magnets for HERA are summarized.