Publisher’s Note: Coherent optical transition radiation and self-amplified spontaneous emission generated by chicane-compressed electron beams [Phys. Rev. ST Accel. Beams<b>12</b>, 040704 (2009)]

Lumpkin, A.H.; Dejus, R.; Sereno, N.S.

doi:10.1103/physrevstab.12.059901

Cited by 12 publications

(20 citation statements)

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“…Another adverse effect of microbunching is the coherent optical transition radiation (COTR) ruining the beam profile diagnostics at OTR stations downstream of beam compression. Such effects were observed, for instance, at SLAC Linac Coherent Light Source (LCLS) [15] and ANL Advanced Photon Source [16,17]. The visible COTR can be attributed to the microbunching related to the longitudinal space charge (LSC) impedance and is consistent with the 3D LSC modeling [18].…”

Section: Introductionsupporting

confidence: 60%

Initial source of microbunching instability studies in a free electron laser injector

Seletskiy

Hidaka

Murphy

et al. 2011

Phys. Rev. ST Accel. Beams

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We present the first experimental studies of the initial source of electron beam microbunching instability in a free electron laser (FEL) injector. By utilizing for the studies a transform-limited laser pulse at the photocathode, we eliminated laser-induced microbunching at the National Synchrotron Light Source Source Development Laboratory (SDL). The detailed measurements of the resulting electron beam led us to conclude that, at SDL, microbunching arising from shot noise is not amplified to any significant level, thereby allowing us to set an upper limit on the initial modulation depth of microbunching arising from shot noise. Our analysis demonstrated that the only significant source of microbunching instability under normal operational conditions at SDL is the longitudinal modulation of the photocathode laser pulse. Our work shows that assuring a longitudinally smoothed photocathode laser pulse allows mitigating microbunching instability at a typical FEL injector with a moderate microbunching gain.

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Section: Introductionsupporting

confidence: 60%

Initial source of microbunching instability studies in a free electron laser injector

Seletskiy

Hidaka

Murphy

et al. 2011

Phys. Rev. ST Accel. Beams

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“…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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“…The angular distance between the peaks induced by the acoustic waves is of the order (ω s /ω)(c/v s ). The condition (27) can be written in a physically more transparent form if, in addition to (19), we introduce the wave vector k 0 for the photon inside the plate (in the absence of the acoustic wave), with the components…”

Section: Optical Transition Radiation In Presence Of Acoustic Waves Fmentioning

confidence: 99%

“…Such radiation has a number of remarkable properties and at present it has found many important applications. [1][2][3][4][5] In particular, the transition radiation is widely used for particle identification, for the measurement of transverse size, divergence and energy of electron and proton beams (see, for instance, [6][7][8][9][10][11][12][13][14][15][16][17][18][19] and references therein). An enhancement for the transition radiation intensity may be achieved by using the interference between the radiation emitted by many interfaces in a multilayer structure.…”

Section: Introductionmentioning

confidence: 99%

Optical Transition Radiation in Presence of Acoustic Waves for an Oblique Incidence

Mkrtchyan

Parazian

Saharian

2012

Int. J. Mod. Phys. B

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Forward transition radiation is considered in an ultrasonic superlattice excited in a finite thickness plate under oblique incidence of relativistic electrons. We investigate the influence of acoustic waves on both the intensity and polarization of the radiation. In the quasi-classical approximation, formulas are derived for the vector potential of the electromagnetic field and for the spectral-angular distribution of the radiation intensity. It is shown that the acoustic waves generate new resonance peaks in the spectral and angular distributions. The heights and the location of the peaks can be controlled by choosing the parameters of the acoustic wave. The numerical examples are given for a plate of fused quartz.

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Publisher’s Note: Coherent optical transition radiation and self-amplified spontaneous emission generated by chicane-compressed electron beams [Phys. Rev. ST Accel. Beams12, 040704 (2009)]

Cited by 12 publications

References 0 publications

Initial source of microbunching instability studies in a free electron laser injector

Initial source of microbunching instability studies in a free electron laser injector

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

Optical Transition Radiation in Presence of Acoustic Waves for an Oblique Incidence

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