High-precision performance testing of the LHC power converters

The magnet power converters for LHC were procured in three parts, power part, current transducers and control electronics, to enable a maximum of industrial participation in the manufacturing and still guarantee the very high precision (a few parts in 10 -6 ) required by LHC. One consequence of this approach was several stages of system tests: factory reception tests,CERN reception tests, integration tests, short-circuit tests and commissioning on the final load in the LHC tunnel. The majority of the power converters for LHC have now been delivered, integrated into complete converters and high- precision performance testing is well advanced. This paper presents the techniques used for high-precision testing and the results obtained.