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<p>In modern storage rings, microwave instability frequently represents a critical performance-limiting factor. A storage ring-based coherent light source (SRCLS) generally requires high average current to generate coherent extreme ultraviolet (EUV) radiation, featuring exceptionally strong damping capabilities and high beam current operation. To achieve high average power, this kind of light source maintains beam parameters characterized by high intensity, short bunch length, and a reduced momentum compaction factor, which heightens the significance of microwave instability. Notably, when particles propagate through bending magnets, there are substantially stronger coherent synchrotron radiation (CSR) effects compared to conventional light sources. Furthermore, the implementation of multiple damping wigglers to achieve short damping times produces intense coherent wiggler radiation (CWR). Given these considerations, a thorough investigation of microwave instability becomes imperative. This paper provides a comprehensive characterization of the dominant short-range wake fields in the storage ring and investigates the corresponding microwave instability thresholds.</p>

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Microwave instability study in a high-current electron storage ring

  • 期刊论文

  • 发表日期：

    2026年3月16日

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  • Weijie Fan,
  • Ji Li,
  • Yanxu Wang,
  • Chao Feng,
  • Qinglei Zhang,
  • Demin Zhou

摘要

In modern storage rings, microwave instability frequently represents a critical performance-limiting factor. A storage ring-based coherent light source (SRCLS) generally requires high average current to generate coherent extreme ultraviolet (EUV) radiation, featuring exceptionally strong damping capabilities and high beam current operation. To achieve high average power, this kind of light source maintains beam parameters characterized by high intensity, short bunch length, and a reduced momentum compaction factor, which heightens the significance of microwave instability. Notably, when particles propagate through bending magnets, there are substantially stronger coherent synchrotron radiation (CSR) effects compared to conventional light sources. Furthermore, the implementation of multiple damping wigglers to achieve short damping times produces intense coherent wiggler radiation (CWR). Given these considerations, a thorough investigation of microwave instability becomes imperative. This paper provides a comprehensive characterization of the dominant short-range wake fields in the storage ring and investigates the corresponding microwave instability thresholds.