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

Research output: Contribution to conferencePaper

5 Citations (Scopus)

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.

Conference

ConferenceParticle Accelerator Conference, 2005. PAC 2005. Proceedings of the
CountryUnited States
CityKnoxville, Tennessee
Period16/05/0520/05/05

Fingerprint

particle beams
free electron lasers
amplifiers
harmonics
modulation
Liouville theorem
energy
electron radiation
radiation
masers
cyclotron resonance
high gain
free electrons
synchronism
electron scattering
generators

Keywords

  • strong density modulation
  • small energy dispersion
  • particle beams
  • harmonic amplifier
  • free electron laser

Cite this

McNeil, B. W. J., Poole, M. W., & Robb, G. R. M. (2005). Inducing strong density modulation with small energy dispersion in particle beams and the harmonic amplifier free electron laser. 1718 - 1720. Paper presented at Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the, Knoxville, Tennessee, United States. https://doi.org/10.1109/PAC.2005.1590889
McNeil, B W J ; Poole, M W ; Robb, G R M. / Inducing strong density modulation with small energy dispersion in particle beams and the harmonic amplifier free electron laser. Paper presented at Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the, Knoxville, Tennessee, United States.3 p.
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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.",
keywords = "strong density modulation , small energy dispersion , particle beams, harmonic amplifier , free electron laser",
author = "McNeil, {B W J} and Poole, {M W} and Robb, {G R M}",
note = "21st Particle Accelerator Conference (PAC), Knoxville, TN, MAY 16-20, 2005 Print ISBN: 0-7803-8859-3 ; Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the ; Conference date: 16-05-2005 Through 20-05-2005",
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pages = "1718 -- 1720",

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McNeil, BWJ, Poole, MW & Robb, GRM 2005, 'Inducing strong density modulation with small energy dispersion in particle beams and the harmonic amplifier free electron laser' Paper presented at Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the, Knoxville, Tennessee, United States, 16/05/05 - 20/05/05, pp. 1718 - 1720. https://doi.org/10.1109/PAC.2005.1590889

Inducing strong density modulation with small energy dispersion in particle beams and the harmonic amplifier free electron laser. / McNeil, B W J; Poole, M W; Robb, G R M.

2005. 1718 - 1720 Paper presented at Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the, Knoxville, Tennessee, United States.

Research output: Contribution to conferencePaper

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T1 - Inducing strong density modulation with small energy dispersion in particle beams and the harmonic amplifier free electron laser

AU - McNeil, B W J

AU - Poole, M W

AU - Robb, G R M

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N2 - 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.

AB - 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.

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KW - free electron laser

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McNeil BWJ, Poole MW, Robb GRM. Inducing strong density modulation with small energy dispersion in particle beams and the harmonic amplifier free electron laser. 2005. Paper presented at Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the, Knoxville, Tennessee, United States. https://doi.org/10.1109/PAC.2005.1590889