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Steady-state microbunching (SSMB) has been proposed as a scheme to generate high average power coherent synchrotron radiation at short wavelengths from an electron storage ring. To evaluate the feasibility of this scheme, a proof-of-principle experiment is conducted at the Metrology Light Source (MLS) in Berlin, the first phase of which (PoP I) was concluded in 2024. PoP I utilized a single-shot laser system to provide an energy modulation to the electron beam and investigated the fundamental requirements on storage ring dynamics to enable SSMB. Recently, the second phase of the SSMB proof-of-principle experiment (PoP II) has commenced at the MLS, in which a high repetition rate phase-locked laser system provides turn-by-turn energy modulation of the electron beam on consecutive revolutions around the storage ring. The main goal of SSMB PoP II is to show electrons can be confined to individual microbuckets defined by this laser interaction, reaching a quasi-steady state. This paper presents the first results obtained in SSMB PoP II, where coherent synchrotron radiation has been detected following multi-turn laser modulation, and the ongoing systematic studies of the underlying microbunching process.
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