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Related Experiment Videos

Wake-field and fast head-tail instability caused by an electron cloud.

K Ohmi1, F Zimmermann, E Perevedentsev

  • 1CERN, Geneva, Switzerland.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|January 22, 2002
PubMed
Summary

Electron clouds in particle accelerators can cause instabilities. This study analyzes the electron-cloud wake field and its impact on transverse-mode-coupling instability in storage rings.

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Area of Science:

  • Accelerator Physics
  • Plasma Physics
  • Particle Beam Dynamics

Background:

  • Electron clouds form in particle storage rings due to various emission processes during multibunch operation.
  • These electron clouds exert forces on passing particle bunches, acting like short-range wake fields.
  • Such wake fields can lead to transverse-mode-coupling instabilities if electron cloud density surpasses a critical threshold.

Purpose of the Study:

  • To analytically and computationally determine the electron-cloud induced wake field in the absence of external magnetic fields.
  • To investigate the wake function's linearity, time dependence, and sensitivity to electron cloud size.
  • To evaluate theoretical models for transverse-mode-coupling instability and fast transverse blow-up thresholds.

Main Methods:

Related Experiment Videos

  • Analytical calculations of the electron-cloud wake field.
  • Computer simulations for wake field analysis.
  • Application of a broadband resonator model for wake fields.
  • Evaluation of instability thresholds using the linearized Vlasov equation.

Main Results:

  • Computed electron-cloud induced wake for KEKB positron ring and LHC proton beam parameters.
  • Characterized the wake function's properties, including its dependence on electron cloud density and size.
  • Derived theoretical expressions for transverse-mode-coupling instability and fast transverse blow-up thresholds.

Conclusions:

  • The electron cloud wake field is a significant factor in beam instabilities in storage rings.
  • Understanding the wake field properties is crucial for predicting and mitigating transverse instabilities.
  • The study provides a theoretical framework for analyzing beam stability in the presence of electron clouds.