Göttingen 2025 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 13: Radiofrequency and Instrumentation II

AKBP 13.1: Talk

Friday, April 4, 2025, 11:00–11:15, ZHG004

Design of a permanent magnet septum with variable field strength for ELSA — •Daniel Fry, Klaus Desch, Dennis Proft, and Michael Switka — Physikalisches Institut der Universität Bonn

As a way to greener accelerators and reduced power consumption permanent magnets have been a rising contender in the last years. For a first project in this field at the ELSA electron accelerator, a permanent magnet septum is designed and evaluated for its feasibility. Intended for a beam energy range of 0.5GeV−3.2GeV magnetic field stregths of 0.15T−0.97T need to be achieved. A mechanism with moveable Samarium-Cobalt (SmCo) magnets, which are chosen for their radiation hardness, is proposed. The magnets are moved from the iron yokes of the septum into a magnetic short circuit iron loop to cover the variable field strength. CST Studio simulations are used to evaluate possibilities to minimize the magnetic forces on this movement and the feasibility of the design. A simulation model is presented and further steps towards construction are discussed.

Keywords: Permanent Magnet; Beam Extraction; Magnets; Septum