Speaker
Description
HZB is developing BESSYIII, a future 4th-generation low-emittance diffraction-limited soft-to-tender X-ray synchrotron light source, as a green-field facility in 2035 on the premises of the Adlershof technological campus in Berlin, Germany. We are in the design phase of magnet concepts for all permanent-magnet (PM-)based linear and resistive multipole magnets, fulfilling the requirements of the CDR-project design of Higher-Order Achromat Multi-Bend Achromat (HOA-MBA) storage ring lattice. Exposition is given to the optimization of the magnetic design and resulting technical considerations for solutions of field tunability and correction, thermal operational stability and follow-up mechanical realization and measurements of the rare-earth PM-based magnets envisaged for the energy-efficient linear optics and ring performance of BESSYIII, stepping on lessons so-far learned from the BESSYII+ upgrade and RF2.0 projects. In this paper we give an overview of the design progress on the PM-based magnets and of considered options for the required higher-order magnet families such as resistive sextupoles and octupoles.
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