On the coherent radiation of an electron bunch moving in an arc of a circle

Saldin, E.L.; Schneidmiller, Evgeni; Yurkov, M.V.

doi:10.1016/s0168-9002(97)00822-x

Cited by 190 publications

(211 citation statements)

References 7 publications

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“…In order to validate the simple analytical model described above, numerical simulations of the LPS beam dynamics were carried using a multi-particle model. The simulations also enable the investigation of possible detrimental effects resulting from collective effects such as longitudinal space charge (LSC) and beam self interaction via coherent synchrotron radiation (CSR) [20]. In these simulations, the beam dynamics in the rf-gun was modeled with the particle-in-cell program astra [21] and the obtained distribution was subsequently tracked in the accelerating modules using a 1D-1V program that incorporates a one-dimensional model of the LSC.…”

mentioning

confidence: 99%

Generation and Characterization of Electron Bunches with Ramped Current Profiles in a Dual-Frequency Superconducting Linear Accelerator

et al. 2012

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We report on the successful experimental generation of electron bunches with ramped current profiles. The technique relies on impressing nonlinear correlations in the longitudinal phase space using a superconducing radiofrequency linear accelerator operating at two frequencies and a currentenhancing dispersive section. The produced ∼ 700-MeV bunches have peak currents of the order of a kilo-Ampère. Data taken for various accelerator settings demonstrate the versatility of the method and in particular its ability to produce current profiles that have a quasi-linear dependency on the longitudinal (temporal) coordinate. The measured bunch parameters are shown, via numerical simulations, to produce gigavolt-per-meter peak accelerating electric fields with transformer ratios larger than 2 in dielectric-lined waveguides.

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confidence: 99%

Generation and Characterization of Electron Bunches with Ramped Current Profiles in a Dual-Frequency Superconducting Linear Accelerator

et al. 2012

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“…Transient effects at magnet edges Using retarded fields, Saldin et al [6] derive, in the ultrarelativistic limit, a formula for the wakefield due to a bunch entering from a drift region into a bend…”

Section: Csr Wake Formulamentioning

confidence: 99%

“…Many papers covering the history and importance of CSR forces can be found in [3]. This paper uses an approach to calculate the CSR wakefield originating with Saldin, Schneidmiller, and Yurkov [4] which is a generalization of a prior calculation [5,6]. The calculation starts with the CSR force between two charges traveling on the same curve, and integrates over a longitudinal bunch distribution to give a longitudinal wakefield.…”

Section: Introductionmentioning

confidence: 99%

Extended one-dimensional method for coherent synchrotron radiation including shielding

Sagan

Hoffstaetter

Mayes

et al. 2009

Phys. Rev. ST Accel. Beams

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Coherent synchrotron radiation can severely limit the performance of accelerators designed for high brightness and short bunch length. Examples include light sources based on energy recovery LINAC or free-electron lasers, and bunch compressors for linear colliders. In order to better simulate coherent synchrotron radiation, a one-dimensional formalism due to Saldin, Schneidmiller, and Yurkov has been implemented in the general beam dynamics code Bmad. Wide vacuum chambers are simulated by means of vertical image charges. Results from Bmad are here compared to analytical approximations, to numerical solutions of the Maxwell equations, and to the simulation code ELEGANT and the code of Agoh and Yokoya.

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“…This effect was first observed in numerical simulations with the code ELEGANT and led to a serious concern for its impact on FEL performance [2]. Several theoretical studies advanced our understanding of the microbunching instability [3][4][5] leading to the development of various suppression schemes [6], while simple numerical methods have been successful in simulating its basic mechanism [7]. Encouraged by these advancements, the FEL community set out to organize a series of workshops [8] to further our theoretical understanding and numerical modeling of the microbunching instability, as well as improve experimental observations and diagnostic techniques.…”

Section: Introductionmentioning

confidence: 97%

“…The line-charge (1D) approximation [3] of a beam bunch is one such approximation, in which the CSR effects are likely overrated by the collapse of the transverse distribution onto a rigid line. Point-topoint approaches mimic the self-interaction of the beam by direct interaction among N macroparticles which represent the beam charge density [9,10].…”

Section: Introductionmentioning

confidence: 99%

New density estimation methods for charged particle beams with applications to microbunching instability

Terzić

Bassi

2011

Phys. Rev. ST Accel. Beams

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In this paper we discuss representations of charge particle densities in particle-in-cell simulations, analyze the sources and profiles of the intrinsic numerical noise, and present efficient methods for their removal. We devise two alternative estimation methods for charged particle distribution which represent significant improvement over the Monte Carlo cosine expansion used in the 2D code of Bassi et al. ], designed to simulate coherent synchrotron radiation (CSR) in charged particle beams. The improvement is achieved by employing an alternative beam density estimation to the Monte Carlo cosine expansion. The representation is first binned onto a finite grid, after which two grid-based methods are employed to approximate particle distributions: (i) truncated fast cosine transform; and (ii) thresholded wavelet transform (TWT). We demonstrate that these alternative methods represent a staggering upgrade over the original Monte Carlo cosine expansion in terms of efficiency, while the TWT approximation also provides an appreciable improvement in accuracy. The improvement in accuracy comes from a judicious removal of the numerical noise enabled by the wavelet formulation. The TWT method is then integrated into the CSR code [G. Bassi, J. A. Ellison, K. Heinemann, and R. Warnock, Phys. Rev. ST Accel. Beams 12, 080704 (2009)], and benchmarked against the original version. We show that the new density estimation method provides a superior performance in terms of efficiency and spatial resolution, thus enabling high-fidelity simulations of CSR effects, including microbunching instability.

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On the coherent radiation of an electron bunch moving in an arc of a circle

Cited by 190 publications

References 7 publications

Generation and Characterization of Electron Bunches with Ramped Current Profiles in a Dual-Frequency Superconducting Linear Accelerator

Generation and Characterization of Electron Bunches with Ramped Current Profiles in a Dual-Frequency Superconducting Linear Accelerator

Extended one-dimensional method for coherent synchrotron radiation including shielding

New density estimation methods for charged particle beams with applications to microbunching instability

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