Abstract
Three 1 m long superconducting dipole prototypes with 100 mm inner coil diameter for the proposed HERA electron-proton storage ring have been built and tested. Main design principles are a two layer coil clamped with stainless steel collars inside a cryostat with warm beam tube and surrounded by a warm iron yoke. All prototypes have been tested without yoke and one of them with yoke. The design induction of 4.73 Tesla at 4.6 K has been easily surpassed up to short sample fields with negligible training. The quench behaviour has been investigated between temperatures of 3.8 K and 5.0 K. The field quality has been found well within the specified limits given by the requirements of the storage ring optics. The reproducibility found in this sample of magnets gives great confidence for the production of dipole prototypes of full length.
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