High-energy inverse free-electron-laser accelerator

Courant, E. D.; Pellegrini, C.; Żakowicz, W.

doi:10.1103/physreva.32.2813

Cited by 127 publications

(78 citation statements)

References 8 publications

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“…For these tests calculations of a single probe electron trajectory and its synchronicity with the laser field are done with a code based on the Table 1 The laser beam initial parameters Laser wavelength l 10.6 mm Laser power range 0.4-0.8 TW Rayleigh range z R 3.6 cm Laser waist w 0 0.35 mm Laser waist at the undulator entrance w 0 Á w 2.5 mm Lorentz equations and using MathCAD. 1 This control is made on-line with the Radia simulations. A version was considered as final one when corrections of the field decreased to a level o0.1%.…”

Section: Ifel Project Basic Parameters and Electron Dynamics Simulationsmentioning

confidence: 99%

“…One important difference is in the range of electron energy changes during the process and another one is the problem of electron bunch trapping in a bucket during the acceleration. This problem was investigated theoretically many years ago, but only in the approximation of slowly varying magnetic field or adiabatic regime (see for example, [1,2]). Here we will consider a design with strong tapering of the magnetic fields and fast varying laser fields.…”

Section: Introductionmentioning

confidence: 99%

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An undulator with non-adiabatic tapering for the IFEL project

Varfolomeev¹,

Tolmachev²,

Yarovoi³

et al. 2002

Nuclear Instruments and Methods in Physics Research Section A:

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We describe the design of a planar undulator with unusually strong tapering, for the inverse FEL experiment (on the IFEL experiment at the UCLA Neptune Lab. (1998) 437) at UCLA. A powerful TW CO 2 laser will be used to accelerate electrons up to 50-60 MeV in 50 cm long undulator. A strong undulator tapering is needed because of the short Rayleigh length of the laser beam. Both the magnetic field and the undulator period are tapered to provide synchronicity of the laser beam interaction with a captured electron bunch along the whole undulator length. The most critical part of the undulator is the region near the laser focus. The main characteristics of the IFEL, such as the percentage of trapped electrons, energy of accelerated electrons and sensitivity to the laser focus transverse position, are given. The general principles of the design of this undulator construction can also be useful for high efficiency FEL amplifiers of intense laser modes. r

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Section: Ifel Project Basic Parameters and Electron Dynamics Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An undulator with non-adiabatic tapering for the IFEL project

Varfolomeev¹,

Tolmachev²,

Yarovoi³

et al. 2002

Nuclear Instruments and Methods in Physics Research Section A:

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“…condition, as was discussed for an inverse free electron laser accelerator in [11], and is fulfilled in any accelerator.…”

Section: A Electron Deflectionmentioning

confidence: 99%

Particle acceleration by wave scattering off dielectric spheres at whispering-gallery-mode resonance

Żakowicz

2007

Phys. Rev. ST Accel. Beams

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The large electromagnetic fields, created in wave scattering near a perfect dielectric sphere at the condition of whispering-gallery-mode resonances, are investigated as driving units for high energy charged particle accelerators. For optimal trajectories passing near the scattering sphere, particle coupling with the field reduces to very short intervals, of the order of the wave period. Interacting fields can be almost 1000 times stronger than that in the incident wave. An example considered indicates that the instantaneous energy yield during this strong coupling interval is equivalent to 30 GeV=m, assuming the incident electric field E 0 100 MV=m. It was shown that the particle transverse deflection is negligible if the phase of the particle is optimal for acceleration. Hence, the acceleration process can be repeated many times. A rough estimate of the energy gain in a periodic chain of such elementary accelerating unit cells gives Energy=m 5 GeV=m, which is several hundred times more than in contemporary operating and projected accelerators. Preliminary estimates of absorption losses in the scheme are given.

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“…Another important application of FEL principle is the particle acceleration by the inverse mechanism. Particle acceleration by inverse free-electron-laser principle has been demonstrated both theoretically [12] and experimentally [13,14]. In contrast, much less seems to be known for the complementary geometry, in which the electron bunch interacts with a counterpropagating electromagnetic wave, perhaps because of the absence of acceleration schemes for this case.…”

Section: Introductionmentioning

confidence: 99%