1–6 Jun 2025
Taipei International Convention Center (TICC)
Asia/Taipei timezone

Measurement of coherent synchrotron frequencies under conditions close to the Robinson limit at the Aichi Synchrotron Radiation Center

WEPS007
4 Jun 2025, 16:00
2h
Exhibiton Hall A _Salmon (TWTC)

Exhibiton Hall A _Salmon

TWTC

Poster Presentation MC5.D06 Coherent and Incoherent Instabilities Measurements and Countermeasures Wednesday Poster Session

Speaker

Shogo Sakanaka (High Energy Accelerator Research Organization)

Description

Past measurements* of coherent synchrotron frequencies at the Photon Factory storage ring revealed that the behavior of measured coherent frequencies could not be well explained with standard 4th-order characteristic equation under conditions close to the Robinson limit. To investigate whether similar phenomenon occurs in other storage rings, we measured the coherent synchrotron frequencies at a 1.2-GeV electron storage ring of Aichi Synchrotron Radiation Center as a function of the cavity voltage and the beam current. At beam currents higher than about 200 mA, we observed double peaks, one with a frequency higher than the incoherent synchrotron frequency and one with a lower frequency, that can correspond to two independent solutions of the 4th-order characteristic equation. Our preliminary analysis indicated that the frequencies of lower-frequency peak did not agree well with those predicted by the characteristic equation. We also observed that under a condition very close to the Robinson limit, the beam exhibited strong longitudinal coherent self-excited oscillation without beam dump. We present these measurement results and updated analysis.

Funding Agency

This work was supported by JSPS KAKENHI Grant Number JP24K15602.

Footnotes

  • T. Yamaguchi et al., Phys. Rev. Acc. Beams 26, 044401 (2023).
Region represented Asia
Paper preparation format Word

Author

Shogo Sakanaka (High Energy Accelerator Research Organization)

Co-authors

Takaaki Yamaguchi (High Energy Accelerator Research Organization) Naoto Yamamoto (High Energy Accelerator Research Organization) Masaki Fujimoto (Nagoya University) Yasuo Okajima (Nagoya University) Yoshifumi Takashima (Nagoya University)

Presentation materials

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