Next generation of fast-cycled dipoles for SIS300 synchrotron

The SIS300 is one of the two fast ramped synchrotrons of the future FAIR facility to be built at the site of GM at Darmstadt, Germany. Planned to be installed during the second phase of FAIR, preliminary R&D work has to be carried out now to be ready to build up the machine later on without delay. Some remarkable results have been achieved over the last years concerning the development of the magnets for this machine, which are of superconducting cos(theta) type. For example a low loss Rutherford cable with stainless steel core and small filament wires has been developed. Also prototype magnets, dipoles as well as quadrupoles, have been manufactured and tested successfully. The experiences with the first curved dipole in the frame of the DISCORAP project showed the need for some changes in the design of the collared coil. Such a new collared coil is under construction now in the frame of the European CRISP project. The presentation will show the lessons learned from the DISCORAP project and the actual status of the CRISP coil.