Fundamentals of Beam Physics

Rosenzweig, J.

doi:10.1093/acprof:oso/9780198525547.001.0001

Cited by 57 publications

(51 citation statements)

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“…To accurately simulate realistic interactions between a high brightness electron beam and a laser pulse, and study their influence on high-precision Compton scattering light sources, a fully 3D code is required. For long, narrowband laser pulses, a direct approach, accounting for fine details in the correlated electron beam phase space [15], is computationally intensive. Instead, one can take advantage of the slow-varying pulse envelope, paraxial, and weakly nonlinear approximations to develop a local plane-wave model leading to analytical expressions for the electron 4-trajectory.…”

Section: Fig 1 Scale Invariant Nonlinear Spectrummentioning

confidence: 99%

Low-Intensity Nonlinear Spectral Effects in Compton Scattering

et al. 2010

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Section: Fig 1 Scale Invariant Nonlinear Spectrummentioning

confidence: 99%

Low-Intensity Nonlinear Spectral Effects in Compton Scattering

et al. 2010

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“…To include nonplane wave effects in the calculation, we consider the distribution of perpendicular k-vector components within the laser pulse focus as representing the spread in the direction of the incoming photons, while representing the laser focus within the paraxial approximation [26,27].…”

Section: B Laser Focus Effectsmentioning

confidence: 99%

“…Using the analogy of the Rayleigh range to the beta function of a particle beam focus, it is possible to express an effective 1=e 2 ''emittance'' of the laser beam as [26] …”

Section: B Laser Focus Effectsmentioning

confidence: 99%

Three-dimensional time and frequency-domain theory of femtosecond x-ray pulse generation through Thomson scattering

Brown

Hartemann

2004

Phys. Rev. ST Accel. Beams

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The generation of high intensity, ultrashort x-ray pulses enables exciting new experimental capabilities, such as femtosecond pump-probe experiments used to temporally resolve material structural dynamics on atomic time scales. Thomson backscattering of a high intensity laser pulse with a bright relativistic electron bunch is a promising method for producing such high-brightness x-ray pulses in the 10 -100 keV range within a compact facility. While a variety of methods for producing subpicosecond x-ray bursts by Thomson scattering exist, including compression of the electron bunch to subpicosecond bunch lengths and/or colliding a subpicosecond laser pulse in a side-on geometry to minimize the interaction time, a promising alternative approach to achieving this goal while maintaining ultrahigh brightness is the production of a time-correlated (or chirped) x-ray pulse in conjunction with pulse slicing or compression. We present the results of a complete analysis of this process using a recently developed 3D time and frequency-domain code for analyzing the spatial, temporal, and spectral properties an x-ray beam produced by relativistic Thomson scattering. Based on the relativistic differential cross section, this code has the capability to calculate time and space dependent spectra of the x-ray photons produced from linear Thomson scattering for both bandwidth-limited and chirped incident laser pulses. Spectral broadening of the scattered x-ray pulse resulting from the incident laser bandwidth, laser focus, and the transverse and longitudinal phase space of the electron beam were examined. Simulations of chirped x-ray pulse production using both a chirped electron beam and a chirped laser pulse are presented. Required electron beam and laser parameters are summarized by investigating the effects of beam emittance, energy spread, and laser bandwidth on the scattered x-ray spectrum. It is shown that sufficient temporal correlation in the scattered x-ray spectrum to produce sub-100 fs temporal slice resolution can be produced from state-of-the-art, high-brightness electron beams without the need to perform longitudinal compression on the electron bunch.

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“…Analogous to the Rayleigh length of a laser beam, the minimum β-function β * = γσ 2 y / N characterizes the beam size variation along the propagation, where γ is the Lorentz factor of the bunch, σ is the root-mean-square (RMS) bunch size and N is the normalized emittance. 23 In contrast, the ponderomotive force of the laser radial field also provides a confinement force for the electron bunch, similar to the effect of pushing the plasma electrons to concentrate in the center. The electron bunch will experience the maximum focusing force when it becomes synchronized with the peak of the laser pulse envelope.…”

Section: Introductionmentioning

confidence: 99%

Particle-in-cell simulations of quasi-phase matched direct laser electron acceleration in density-modulated plasma waveguides

et al. 2014

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TaiwanQuasi-phase matched direct laser acceleration (DLA) of electrons can be realized with guided, radially polarized laser pulses in density-modulated plasma waveguides. A 3-D particle-in-cell model has been developed to describe the interactions among the laser field, injected electrons, and the background plasma in the DLA process. Simulations have been conducted to study the scheme in which seed electron bunches with moderate energies are injected into a plasma waveguide and the DLA is performed by use of relatively low-power (0.5-2 TW) laser pulses. Selected bunch injection delays with respect to the laser pulse, bunch lengths, and bunch transverse sizes have been studied in a series of simulations of DLA in a plasma waveguide. The results show that the injection delay is important for controlling the final transverse properties of short electron bunches, but it also affects the final energy gain. With a long injected bunch length, the enhanced ion-focusing force helps to collimate the electrons and a relatively small final emittance can be obtained. DLA efficiency is reduced when a bunch with a greater transverse size is injected; in addition, micro-bunching is clearly observed due to the focusing and defocusing of electrons by the radially directed Lorentz force. DLA should be performed with a moderate laser power to maintain favorable bunch transverse properties, while the waveguide length can be extended to obtain a higher maximum energy gain, with the commensurate increase of laser pulse duration and energy.

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Fundamentals of Beam Physics

Cited by 57 publications

References 0 publications

Low-Intensity Nonlinear Spectral Effects in Compton Scattering

Low-Intensity Nonlinear Spectral Effects in Compton Scattering

Three-dimensional time and frequency-domain theory of femtosecond x-ray pulse generation through Thomson scattering

Particle-in-cell simulations of quasi-phase matched direct laser electron acceleration in density-modulated plasma waveguides

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