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J. E. Ralph

First Name: J

Middle Name: E

Last Name: Ralph

Full Name: J. E. Ralph

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2 papers

title: High Energy Gain of Trapped Electrons in a Tapered, Diffraction-Dominated Inverse-Free-Electron Laser

format: preprint

year: 2005

17 authors: P. Musumeci | S. Boucher | A. Doyuran | R. J. England | C. Pellegrini | J. B. Rosenzweig | G. Travish | R. B. Yoder | S. Ya. Tochitsky | C. E. Clayton | C. Joshi | J. E. Ralph | C. Sung | S. Tolmachev | A. A. Varfolomeev | A. A. Varfolomeev Jr. | T. Yarovoi

abstract: Energy gain of trapped electrons in excess of 20 MeV has been demonstrated in an Inverse-Free- Electron-Laser (IFEL) accelerator experiment. A 14.5 MeV electron beam is copropagated with a 400 GW CO2 laser beam in a 50 cm long undulator strongly tapered in period and ¯eld amplitude. The Rayleigh range of the laser, » 1.8 cm, is much shorter than the undulator length yielding a di®raction-dominated interaction. Experimental results on the dependence of the acceleration on injection energy, laser focus position, and laser power are discussed. Simulations, in good agreement with the experimental data, show that most of the energy gain occurs in the ¯rst half of the undulator at a gradient of 70 MeV/m and that the structure in the measured energy spectrum arises because of higher harmonic IFEL interaction in the second half of the undulator.

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title: High Energy Gain of Trapped Electrons in a Tapered, Diffraction-Dominated Inverse-Free-Electron Laser

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17 authors: P. Musumeci | S.Ya. Tochitsky | S. Boucher | C. Clayton | A. Doyuran | R. J. England | C. Joshi | C. Pellegrini | J. E. Ralph | J. B. Rosenzweig | C. Sung | S. Tolmachev | G. Travish | A. A. Varfolomeev | A. A. Varfolomeev Jr. | T. Yarovoi | R. B. Yoder

abstract: Energy gain of trapped electrons in excess of 20 MeV has been demonstrated in an inverse-freeelectron-laser (IFEL) accelerator experiment. A 14.5 MeVelectron beam is copropagated with a 400 GW CO2 laser beam in a 50 cm long undulator strongly tapered in period and field amplitude. The Rayleigh range of the laser, 1:8 cm, is much shorter than the undulator length yielding a diffraction-dominated interaction. Experimental results on the dependence of the acceleration on injection energy, laser focus position, and laser power are discussed. Simulations, in good agreement with the experimental data, show that most of the energy gain occurs in the first half of the undulator at a gradient of 70 MeV=m and that the structure in the measured energy spectrum arises because of higher harmonic IFEL interaction in the second half of the undulator.

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title:	High Energy Gain of Trapped Electrons in a Tapered, Diffraction-Dominated Inverse-Free-Electron Laser
format:	preprint
year:	2005
17 authors:	P. Musumeci \| S. Boucher \| A. Doyuran \| R. J. England \| C. Pellegrini \| J. B. Rosenzweig \| G. Travish \| R. B. Yoder \| S. Ya. Tochitsky \| C. E. Clayton \| C. Joshi \| J. E. Ralph \| C. Sung \| S. Tolmachev \| A. A. Varfolomeev \| A. A. Varfolomeev Jr. \| T. Yarovoi
abstract:	Energy gain of trapped electrons in excess of 20 MeV has been demonstrated in an Inverse-Free- Electron-Laser (IFEL) accelerator experiment. A 14.5 MeV electron beam is copropagated with a 400 GW CO2 laser beam in a 50 cm long undulator strongly tapered in period and ¯eld amplitude. The Rayleigh range of the laser, » 1.8 cm, is much shorter than the undulator length yielding a di®raction-dominated interaction. Experimental results on the dependence of the acceleration on injection energy, laser focus position, and laser power are discussed. Simulations, in good agreement with the experimental data, show that most of the energy gain occurs in the ¯rst half of the undulator at a gradient of 70 MeV/m and that the structure in the measured energy spectrum arises because of higher harmonic IFEL interaction in the second half of the undulator.
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