• Arlandoo, M.; Abo-Bakr, M.; Goslawski, P.; Li, J.: First Thoughts on Lattices for a possible Metrology Light Source 2. In: IPAC 2021 : Proceedings of the 12th International Particle Accelerator Conference in Campinas, Brazil, 24–28 May 2021. Geneva: JACoW, 2021. - ISBN 978-3-95450-214-1, p. MOPAB262/1-4

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The Physikalisch-Technische Bundesanstalt (PTB), in cooperation with the Helmholtz-Zentrum Berlin (HZB), operates the Metrology Light Source (MLS), which is a low-energy electron storage ring. The MLS can be operated in a low-alpha mode to produce coherent synchroton ration in the far-IR and THz spectral range. In the scope of the Conceptual Design process for a BESSY II successor, the PTB also requested for an MLS successor to cover their increasing demands on synchrotron radiation. A combination of two different machines, one optimized for low emittance (BESSY III) and one for flexible timing capabilities (MLS II), would provide best radiation capabilities for our user community. In this paper, we discuss the demands on the MLS II and propose first lattice candidates which may meet the needs of the PTB and HZB. Currently, we focus on linear lattices for standard user mode with first steps towards nonlinear optimization.