Erratum: Coherent synchrotron radiation instability in a bunch compressor [Phys. Rev. ST Accel. BeamsPRABFM1098-4402<b>5</b>, 064401 (2002)]

Heifets, S.; Stupakov, G.; Krinsky, S.

doi:10.1103/physrevstab.5.129902

Cited by 105 publications

(210 citation statements)

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“…The problem connected with radiative interaction of the particles in the bunch with sinusoidal density excitation moving in a magnetic chicane has been investigated analytically and numerically [11][12][13]. Calculation of the CSR effects shows that this should not be a serious limitation in our case.…”

Section: Discussion Of Complicating Self-interaction Effectsmentioning

confidence: 99%

A simple method for the determination of the structure of ultrashort relativistic electron bunches

Saldin

Schneidmiller

Yurkov

2005

Nuclear Instruments and Methods in Physics Research Section A:

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In this paper we propose a new method for measurements of the longitudinal profile of 100 femtosecond electron bunches for X-ray Free Electron Lasers (XFELs). The method is simply the combination of two well-known techniques, which where not previously combined to our knowledge. We use seed 10-ps 1047 nm quantum laser to produce exact optical replica of ultrafast electron bunches. The replica is generated in apparatus which consists of an input undulator (energy modulator), and the short output undulator (radiator) separated by a dispersion section. The radiation in the output undulator is excited by the electron bunch modulated at the optical wavelength and rapidly reaches 100 MW-level peak power. We then use the now-standard method of ultrashort laser pulse-shape measurement, a tandem combination of autocorrelator and spectrum (FROG -frequency resolved optical gating). The FROG trace of the optical replica of electron bunch gives accurate and rapid electron bunch shape measurements in a way similar to a femtosecond oscilloscope. Real-time single-shot measurements of the electron bunch structure could provide significant information about physical mechanisms responsible for generation ultrashort electron bunches in bunch compressors. The big advantage of proposed technique is that it can be used to determine the slice energy spread and emittance in multishot measurements. It is possible to measure bunch structure completely, that is to measure peak current, energy spread and transverse emittance as a function of time. We illustrate with numerical examples the potential of the proposed method for electron beam diagnostics at the European X-ray FEL.

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Section: Discussion Of Complicating Self-interaction Effectsmentioning

confidence: 99%

A simple method for the determination of the structure of ultrashort relativistic electron bunches

Saldin

Schneidmiller

Yurkov

2005

Nuclear Instruments and Methods in Physics Research Section A:

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“…When including compression, 4. Bunching factor as a function of energy spread induced by the laser heater for peak currents of 0.5 kA (left), 1 kA (center), and 1.6 kA (right).…”

Section: Longitudinal Coherence Lengthmentioning

confidence: 99%

“…Microbunching has been studied extensively both theoretically [1][2][3][4][5][6][7][8][9][10][11][12][13] and experimentally [14][15][16][17][18][19][20][21][22][23]. In the standard model for the longitudinal space charge (LSC) flavor of MBI, density modulations in the beam produce LSC fields that modulate the beam energy, and a subsequent dispersive region generates a corresponding amplification in the density modulation.…”

Section: Introductionmentioning

confidence: 99%

Time-resolved imaging of the microbunching instability and energy spread at the Linac Coherent Light Source

Ratner

Behrens

Ding

et al. 2015

Phys. Rev. ST Accel. Beams

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The microbunching instability (MBI) is a well-known problem for high brightness electron beams and has been observed at accelerator facilities around the world. Free-electron lasers (FELs) are particularly susceptible to MBI, which can distort the longitudinal phase space and increase the beam's slice energy spread (SES). Past studies of MBI at the Linac Coherent Light Source (LCLS) relied on optical transition radiation to infer the existence of microbunching. With the development of the x-band transverse deflecting cavity (XTCAV), we can for the first time directly image the longitudinal phase space at the end of the accelerator and complete a comprehensive study of MBI, revealing both detailed MBI behavior as well as insights into mitigation schemes. The fine time resolution of the XTCAV also provides the first LCLS measurements of the final SES, a critical parameter for many advanced FEL schemes. Detailed MBI and SES measurements can aid in understanding MBI mechanisms, benchmarking simulation codes, and designing future high-brightness accelerators.

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“…On the other hand, it is clear that the beam emittance " does not decrease during compression; it can be at best constant, and may indeed increase due to collective effects [20,21] such as coherent synchrotron radiation. If one assumes that the beam emittance is held constant during compression, and that the beam is injected in a matched fashion to the ion focusing, then the normalized transverse beam size scales~r k p eq " p / k p p .…”

Section: Experimental Scaling With a Gaussian Beam-plasma Systemmentioning

confidence: 99%

Energy loss of a high charge bunched electron beam in plasma: Simulations, scaling, and accelerating wakefields

Rosenzweig

Barov

Thompson

et al. 2004

Phys. Rev. ST Accel. Beams

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The energy loss and gain of a beam in the nonlinear, ''blowout'' regime of the plasma wakefield accelerator, which features ultrahigh accelerating fields, linear transverse focusing forces, and nonlinear plasma motion, has been asserted, through previous observations in simulations, to scale linearly with beam charge. Additionally, from a recent analysis by Barov et al., it has been concluded that for an infinitesimally short beam, the energy loss is indeed predicted to scale linearly with beam charge for arbitrarily large beam charge. This scaling is predicted to hold despite the onset of a relativistic, nonlinear response by the plasma, when the number of beam particles occupying a cubic plasma skin depth exceeds that of plasma electrons within the same volume. This paper is intended to explore the deviations from linear energy loss using 2D particle-in-cell simulations that arise in the case of experimentally relevant finite length beams. The peak accelerating field in the plasma wave excited behind the finite-length beam is also examined, with the artifact of wave spiking adding to the apparent persistence of linear scaling of the peak field amplitude into the nonlinear regime. At large enough normalized charge, the linear scaling of both decelerating and accelerating fields collapses, with serious consequences for plasma wave excitation efficiency. Using the results of parametric particle-in-cell studies, the implications of these results for observing severe deviations from linear scaling in present and planned experiments are discussed.

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Erratum: Coherent synchrotron radiation instability in a bunch compressor [Phys. Rev. ST Accel. BeamsPRABFM1098-44025, 064401 (2002)]

Cited by 105 publications

References 0 publications

A simple method for the determination of the structure of ultrashort relativistic electron bunches

A simple method for the determination of the structure of ultrashort relativistic electron bunches

Time-resolved imaging of the microbunching instability and energy spread at the Linac Coherent Light Source

Energy loss of a high charge bunched electron beam in plasma: Simulations, scaling, and accelerating wakefields

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