• G. Sikler, W. Gaertner, A. Wessner
  BNG, Würzburg
• E.S. Fischer, E. Floch, D. Krämer, J. Macavei, P. Schnizer, C. Schroeder, F. Walter
  GSI, Darmstadt

GSI had manufactured a prototype of a fast cycling superconducting dipole magnet at Babcock Noell GmbH. This is the first full size magnet for the SIS100 synchrotron at the future Facility for Antiproton and Ion Research (FAIR) in Darmstadt / Germany. In close collaboration with GSI, the magnet was technologically developed, manufactured and assembled by Babcock Noell. The system was successfully tested at GSI reaching the nominal cycling performance, including the high ramping rate of 4 T/s and the maximum field of 2.1 T. Especially the superconducting cable, the coils and the iron yoke are subject to strong mechanical and thermal stresses. Here we describe the details on the fabrication of these components and give an outlook on possible improvements of the manufacturing technologies, applicable to future prototypes and series magnets for SIS100.

• E.S. Fischer, A. Bleile, E. Floch, J. Macavei, A. Mierau, P. Schnizer, C. Schroeder, A. Stafiniak, F. Walter
  GSI, Darmstadt
• W. Gaertner, G. Sikler
  BNG, Würzburg

The 100 Tm synchrotron SIS 100 is the core component of the international Facility of Antiproton and Ion Research (FAIR) to be built in Darmstadt. An intensive R&D period was conducted to design 3m long 2T dipoles providing a stable ramp rate of 4 T/s within an usable aperture of 115mm x 60mm with minimum AC losses, high field quality and good long term operation stability. Three full size dipole - and one quadrupole magnets were built. Recently the first dipole magnet, produced by Babcock Noell, was intensively tested at the GSI cryogenic test facility. We present the measured characteristic parameters: training behaviour, the field quality along the load line for DC operation as well as on the ramp, AC losses, and the cryogenic operation limits. We compare them to the calculated results as well as to the requested design performance. Based on the obtained results we discuss adjustments for the final design.

• E.S. Fischer, A. Mierau, P. Schnizer
  GSI, Darmstadt
• P.G. Akishin
  JINR, Dubna, Moscow Region
• R.V. Kurnyshov
  Electroplant, Moscow
• B. Schnizer
  TUG/ITP, Graz
• P.A. Shcherbakov
  IHEP Protvino, Protvino, Moscow Region

The first full size superconducting dipole magnets for the SIS 100 Tm synchrotron were built and tested. The achieved magnetic field has been measured with a rotating coil probe. An intensive Finite Element R&D, necessitated by the used superconducting cable as well as by the complex mechanical coil and yoke structure, allows calculating the field with high accuracy. Elliptic multipoles were used to describe the field within the whole aperture of the vacuum chamber. As the final design for the SIS 100 dipoles is curved, we developed toroidal multipoles describing the field within a curved magnet, and enabling us to interpret the measurement of a rotating coil probe within such magnets. We describe the performance of the magnetic measurement system, present the measured field properties and compare them to the calculated ones.