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Related Experiment Videos

Head-tail instability caused by electron clouds in positron storage rings

Ohmi1, Zimmermann

  • 1KEK, Oho, Tsukuba, Ibaraki 305, Japan.

Physical Review Letters
|October 21, 2000
PubMed
Summary

An electron cloud instability in particle accelerators can disrupt beams. This study explores a single-bunch two-stream instability, simulating its behavior and comparing it to analytical models for better accelerator control.

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Area of Science:

  • Accelerator physics
  • Plasma physics

Background:

  • Electron clouds form in particle accelerators due to secondary or photoemission.
  • These clouds can negatively impact beam stability.

Purpose of the Study:

  • Investigate a single-bunch two-stream instability driven by electron clouds.
  • Analyze the instability's dependence on beam-electron interaction, chromaticity, and synchrotron frequency.

Main Methods:

  • Computer simulations of the instability.
  • Analytical estimations for comparison.

Main Results:

  • The instability can manifest as either linac beam breakup or head-tail instability.
  • Simulation results align with analytical predictions.

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Conclusions:

  • Understanding this electron cloud instability is crucial for particle accelerator design and operation.
  • The study provides a foundation for mitigating beam instabilities in storage rings.