Inducing strong density modulation with small energy dispersion in particle beams and the harmonic amplifier free electron laser

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McNeil, B W J and Poole, M W and Robb, G R M (2005) Inducing strong density modulation with small energy dispersion in particle beams and the harmonic amplifier free electron laser. In: Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the, 2005-05-16 - 2005-05-20. (https://doi.org/10.1109/PAC.2005.1590889)

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Abstract

We present a possible method of inducing a periodic density modulation in a particle beam with little increase in the energy dispersion of the particles. The flow of particles in phase space does not obey Liouville's Theorem. The method relies upon the Kuramoto-like model of collective synchronism found in free electron generators of radiation, such as Cyclotron Resonance Masers and the Free Electron Laser. For the case of an FEL interaction, electrons initially begin to bunch and emit radiation energy with a correlated energy dispersion which is periodic with the FEL ponderomotive potential. The relative phase between potential and particles is then changed by approximately 180 degrees. The particles continue to bunch, however, there is now a correlated re-absorption of energy from the field. We show that, by repeating this relative phase change many times, a significant density modulation of the particles may be achieved with only relatively small energy dispersion. A similar method of repeated relative electron/radiation phase changes is used to demonstrate supression of the fundamental growth in a high gain FEL so that the FEL lases at the harmonic only.

ORCID iDs

McNeil, B W J ORCID logoORCID: https://orcid.org/0000-0002-7267-611X, Poole, M W and Robb, G R M ORCID logoORCID: https://orcid.org/0000-0002-3004-5926;
  • Item type:Conference or Workshop Item(Paper)
    ID code:31111
    Dates:
    Date
    Event
    2005
    Published
    Notes:21st Particle Accelerator Conference (PAC), Knoxville, TN, MAY 16-20, 2005 Print ISBN: 0-7803-8859-3
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:02 Aug 2011 11:54
    Last modified:12 Dec 2024 16:12
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/31111
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