Systematic study on the static Robinson instability in an electron storage ring

Autor: Takaaki Yamaguchi, Shogo Sakanaka, Naoto Yamamoto, Daichi Naito, Takeshi Takahashi
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Physical Review Accelerators and Beams, Vol 26, Iss 4, p 044401 (2023)
Druh dokumentu: article
ISSN: 2469-9888
DOI: 10.1103/PhysRevAccelBeams.26.044401
Popis: The static Robinson instability and associated coherent synchrotron frequencies were systematically studied at the Photon Factory (PF) 2.5-GeV storage ring at KEK. Under machine parameters close to an anticipated Robinson limit, we observed beam dumps at which the beam and related signals were recorded. The evolution of the beam phase and the threshold condition at the beam dumps were consistent with theoretical values calculated based on the uniformly filled point-bunch model. However, we found remarkable discrepancies from theoretical predictions with additional coherent-frequency measurements. Under conditions close to the Robinson limit, we observed an unpredicted sharp peak at a frequency of approximately 5.2 kHz, together with discrepancies in both the frequency and damping rate of the coherent oscillation. These results indicate the importance of further experimental and theoretical studies on the static Robinson instability.
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