Longitudinal pulse shaping for the suppression of coherent synchrotron radiation-induced emittance growth

Mitchell, Chad; Qiang, Ji; Emma, P.

doi:10.1103/physrevstab.16.060703

Cited by 40 publications

(29 citation statements)

References 24 publications

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“…The method offers greater simplicity over other proposed techniques, e.g., based on complex phase-space manipulations [11,41]. Finally, we point out that the proposed method could provide bunch shapes consistent with those required to mitigate energy-spread and transverse emittance dilutions due coherent-synchrotron-radiation in magnetic bunch compressors [42].…”

Section: Discussionmentioning

confidence: 88%

Tailored electron bunches with smooth current profiles for enhanced transformer ratios in beam-driven acceleration

Lémery

Piot

2015

Phys. Rev. ST Accel. Beams

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Collinear high-gradient OðGV=mÞ beam-driven wakefield methods for charged-particle acceleration could be critical to the realization of compact, cost-efficient, accelerators, e.g., in support of TeV-scale lepton colliders or multiple-user free-electron laser facilities. To make these options viable, the high accelerating fields need to be complemented with large transformer ratios >2, a parameter characterizing the efficiency of the energy transfer between a wakefield-exciting "drive" bunch to an accelerated "witness" bunch. While several potential current distributions have been discussed, their practical realization appears challenging due to their often discontinuous nature. In this paper we propose several alternative continuously differentiable (smooth) current profiles which support enhanced transformer ratios. We especially demonstrate that one of the devised shapes can be implemented in a photo-emission electron source by properly shaping the photocathode-laser pulse. We finally discuss a possible superconducting linear-accelerator concept that could produce shaped drive bunches at high-repetition rates to drive a dielectric-wakefield accelerator with accelerating fields on the order of ∼60 MV=m and a transformer ratio ∼5 consistent with a recently proposed multiuser free-electron laser facility.

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Section: Discussionmentioning

confidence: 88%

Tailored electron bunches with smooth current profiles for enhanced transformer ratios in beam-driven acceleration

Lémery

Piot

2015

Phys. Rev. ST Accel. Beams

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“…We refer to the Introduction in [5] for a review of various approaches to the problem of minimizing CSR-effects on the emittance. For additional related work see also [6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Design of a triple-bend isochronous achromat with minimum coherent-synchrotron-radiation-induced emittance growth

Venturini

2016

Phys. Rev. Accel. Beams

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Using a 1D steady-state free-space coherent synchrotron radiation (CSR) model, we identify a special design setting for a triple-bend isochronous achromat that yields vanishing emittance growth from CSR. When a more refined CSR model with transient effects is included in the analysis, numerical simulations show that the main effect of the transients is to shift the emittance growth minimum slightly, with the minimum changing only modestly.

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“…Also, the projected emittance increase caused by CSR can be analytically estimated by using a steady-state CSR model. It turns out that for a four-dipole chicane compressor bending in the x plane, the projected emittance growth inside the 4th dipole of a chicane, assuming a constant bunch length, is [60,61]:…”

Section: Magnetic Compressionmentioning

confidence: 99%

Conceptual and Technical Design Aspects of Accelerators for External Injection in LWFA

et al. 2018

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Laser driven Wake-Field Acceleration (LWFA) has proven its capability of accelerating electron bunches (e-bunches) to up to 4 GeV energy in a single stage while reaching gradients up to hundreds of GV/m. Because of the short period of the accelerating field (typically ranging from 100 fs to 1 ps duration) and the requirement of extremely small beam size (typically smaller than 1 µm) to match the channel, e-bunches can reach extremely high densities. They can be either extracted directly from the plasma or externally injected. The study of the external injection is interesting for two main reasons. On the one hand this method allows better control of the quality of the input beam and on the other hand it is in general necessary when a staged approach of the accelerator is considered. The interest in producing, characterizing and transporting high brightness ultra-short e-bunches has grown together with the interest in LWFA and other novel high-gradient acceleration techniques. In this paper we will review the principal techniques for producing and shaping ultra-short electron bunches with the example of the SINBAD-ARES (Accelerator Research Experiment at SINBAD) linac at the Deutsches Elektronen-Synchrotron (DESY). Our goal is to show how the design of the SINBAD-ARES linac satisfies the requirements for generating high brightness LWFA probes. In the last part of the paper we shall also comment on the technical challenges for electron control and characterization.

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Longitudinal pulse shaping for the suppression of coherent synchrotron radiation-induced emittance growth

Cited by 40 publications

References 24 publications

Tailored electron bunches with smooth current profiles for enhanced transformer ratios in beam-driven acceleration

Tailored electron bunches with smooth current profiles for enhanced transformer ratios in beam-driven acceleration

Design of a triple-bend isochronous achromat with minimum coherent-synchrotron-radiation-induced emittance growth

Conceptual and Technical Design Aspects of Accelerators for External Injection in LWFA

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