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Related Experiment Videos

Photoelectron trapping in quadrupole and sextupole magnetic fields.

L F Wang1, H Fukuma, S Kurokawa

  • 1High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan. wanglf@post.kek.jp

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 9, 2002
PubMed
Summary

Photoelectrons can become trapped in magnetic fields, potentially causing coupled bunch instability in particle accelerators. This trapping is dependent on beam characteristics like bunch length and is a mirror field trap caused by beam disturbance.

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Area of Science:

  • Particle accelerator physics
  • Plasma physics
  • Beam dynamics

Background:

  • Photoelectron clouds are a significant concern in particle accelerators, potentially leading to beam instabilities.
  • Understanding the behavior of photoelectrons within magnetic fields is crucial for accelerator performance.

Purpose of the Study:

  • To investigate a photoelectron-trapping phenomenon observed in simulations.
  • To identify the conditions and mechanisms responsible for photoelectron trapping.
  • To assess the impact of this trapping on accelerator stability, specifically coupled bunch instability.

Main Methods:

  • Simulations of photoelectron cloud dynamics within quadrupole and sextupole magnetic fields.
  • Analysis of photoelectron behavior, including trapping duration and longitudinal drift.

Related Experiment Videos

  • Investigation of beam-dependent factors influencing trapping, particularly positron bunch length.

    • Main Results:

    • A photoelectron-trapping phenomenon was identified in simulations.
    • Photoelectrons can be trapped for extended periods in magnetic fields, even with significant bunch separation.
    • Trapping is strongly dependent on beam parameters, notably bunch length; longer bunches can prevent trapping.
    • The trapping mechanism is identified as a mirror field trap induced by beam disturbance.

    Conclusions:

    • Long-term photoelectron trapping in magnetic fields can lead to coupled bunch instabilities.
    • Beam characteristics, especially bunch length, critically influence photoelectron trapping.
    • The findings highlight the importance of managing photoelectron dynamics for stable accelerator operation.