JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
TY - UNPB AU - Chavanne, J. ED - Braun, Hans-Heinrich ED - Chrin, Jan ED - Ganter, Romain ED - Hiller, Nicole ED - Schaa, Volker RW TI - The Challenges and Benefits of Increased Application of Permanent Magnets to Future Light Sources J2 - Proc. of FLS2023, Luzern, Switzerland, 27 August-01 September 2023 CY - Luzern, Switzerland T2 - ICFA Advanced Beam Dynamics Workshop T3 - 67 LA - english AB - New storage ring based light sources have been recently constructed or are planned with the aim to reduce the horizontal emittance of the electron beam by about two orders of magnitude. It leads to a considerable increase of the brilliance of the photon beams produced at the sources installed around the storage ring. In many cases theses developments correspond to the upgrades of existing third generation facilities. The resulting accelerator lattice is a very compact arrangement of different types of magnets with demanding field properties. In addition, the need to provide energy saving solutions comes as an additional boundary condition. In this context, it looks obvious that Permanent Magnets (PMs) have been and are considered as an interesting alternative to conventional electromagnets. The ESRF Extremely Brilliant Source (EBS) in operation since beginning of 2020 is an example of the successful implantation of PM dipoles. For the majority of ongoing upgrades PMs corresponds to a large fraction of the storage ring magnets. They presently include dipole, quadrupole or combined dipole quadrupole structures. However, for PMs there is a number of specific difficulties to be addressed. These include for example the need to reach the absolute field strength for device which are not tuneable, the thermal stability or the long term stability. These different subjects will be discussed in the light of the EBS experience and the progresses made at several facilities with planned upgrades. PB - JACoW Publishing CP - Geneva, Switzerland ER -