Test of 1 m long model magnets for LHC

Power tests and magnetic measurements have been performed on various 1-m-long LHC (Large Hadron Collider) dipole model magnets. Single- and twin-aperture magnets were energized up to peak fields above 9 T. Quench behavior, improvements in the test facility, and losses in the superconductors were examined. The field quality was measured with rotating coils immersed directly in the 1.8 K bath of the vertical cryostat. The design of these coils and the achieved measurement precision are presented. Preliminary measurements of the persistent currents show an unexpected time-dependent decay of the field harmonics.<>