Status of Preliminary Design Studies for the Three Superferric 30$^\circ$ Bending Magnets for the Energy Buncher of FAIR

CEA is leading the design studies effort for the three superferric dipole magnets (30
$^\circ$
bend) of the Energy Buncher (EB) for the Facility for Antiproton and Ion Research (FAIR). The EB aims at providing energy-bunched beams for intermediate energy experiments with stopped beams and it is located at the end of the low energy branch of the Superconducting FRagment Separator (Super-FRS) for which CEA is already involved. In this context, CEA started the preliminary design studies of these 1.6 T EB dipoles, which incorporates similar features than the Super-FRS dipoles but has some specific challenges with respect to the magnetic and mechanical design aspects. Cryogenics studies are also reported in this paper as they mainly aim at defining whether the active thermosiphon concept (Super-FRS) is still compatible with the new EB magnet design.