Beating the shot-noise limit

Gover, A.; Nause, Ariel; Dyunin, Egor; Fedurin, M.

doi:10.1038/nphys2443

Cited by 20 publications

(9 citation statements)

References 21 publications

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“…In the linear regime (i.e. when the initial density perturbation is small compared to the mean beam density), the dynamics is periodic and the initial condition is retrieved after every plasma period [14,15]. On the other hand, a beam that has a strong initial modulation of its longitudinal charge density (of period ) will experience a nonlinear plasma oscillation which is characterized by enhanced harmonics of .…”

Section: Introductionmentioning

confidence: 99%

Controlling nonlinear longitudinal space charge oscillations for high peak current bunch train generation

Musumeci

Roberts

et al. 2013

Phys. Rev. ST Accel. Beams

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The evolution of picosecond modulations of the longitudinal profile of an electron beam generated in an rf photoinjector is analyzed and optimized with the goal of obtaining high peak current electron bunch trains at very high frequencies (! THz). Taking advantage of nonlinear longitudinal space charge forces, it is found that more than 500 A peak current 1 THz bunch trains can be generated using a standard 1.6 cell SLAC/UCLA/BNL rf gun. Postacceleration is used to freeze the longitudinal phase space dynamics after one half plasma oscillation. Applications range from tunable narrow bandwidth THz radiation generation to drivers for high frequency high gradient accelerators.

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Section: Introductionmentioning

confidence: 99%

Controlling nonlinear longitudinal space charge oscillations for high peak current bunch train generation

Musumeci

Roberts

et al. 2013

Phys. Rev. ST Accel. Beams

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“…An interesting and developing technique that holds promise to lower requirements on the seed laser power is referred to as shot noise suppression. In such schemes, the intrinsic shot noise in the electron beam is reduced by tuning the effective longitudinal particle dynamics in the relativistic beam prior to injection into the FEL undulator (Gover and Dyunin, 2009;Ratner et al, 2011b). Recently the noise suppression was experimentally demonstrated at the optical wavelengths (Gover et al, 2012;, with some studies showing its prospects and challenges at shorter wavelengths (Kim and Lindberg, 2011;Stupakov et al, 2013).…”

Section: Generation Of Fully Coherent X-ray Pulsesmentioning

confidence: 99%

Beam by design: Laser manipulation of electrons in modern accelerators

et al. 2014

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Accelerator-based light sources such as storage rings and free-electron lasers use relativistic electron beams to produce intense radiation over a wide spectral range for fundamental research in physics, chemistry, materials science, biology and medicine. More than a dozen such sources operate worldwide, and new sources are being built to deliver radiation that meets with the ever increasing sophistication and depth of new research. Even so, conventional accelerator techniques often cannot keep pace with new demands and, thus, new approaches continue to emerge. In this article, we review a variety of recently developed and promising techniques that rely on lasers to manipulate and rearrange the electron distribution in order to tailor the properties of the radiation. Basic theories of electron-laser interactions, techniques to create micro-and nano-structures in electron beams, and techniques to produce radiation with customizable waveforms are reviewed. We overview laser-based techniques for the generation of fully coherent x-rays, mode-locked x-ray pulse trains, light with orbital angular momentum, and attosecond or even zeptosecond long coherent pulses in free-electron lasers. Several methods to generate femtosecond pulses in storage rings are also discussed. Additionally, we describe various schemes designed to enhance the performance of light sources through precision beam preparation including beam conditioning, laser heating, emittance exchange, and various laser-based diagnostics. Together these techniques represent a new emerging concept of "beam by design" in modern accelerators, which is the primary focus of this article CONTENTS

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“…It should be noted that Coulomb force is not always detrimental. Coulomb force has been used before to suppress beam shot noise at optical wavelength [17,18], as well as to enhance the electron beam density modulation at THz wavelength [19,20]. In this Letter we demonstrate a scheme that makes use of Coulomb force to compress a relativistic electron beam without introducing additional timing jitter.…”

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confidence: 96%

Coulomb-Driven Relativistic Electron Beam Compression

Jiang

Liu

et al. 2018

Phys. Rev. Lett.

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Coulomb interaction between charged particles is a well-known phenomenon in many areas of research. In general, the Coulomb repulsion force broadens the pulse width of an electron bunch and limits the temporal resolution of many scientific facilities such as ultrafast electron diffraction and x-ray free-electron lasers. Here we demonstrate a scheme that actually makes use of the Coulomb force to compress a relativistic electron beam. Furthermore, we show that the Coulomb-driven bunch compression process does not introduce additional timing jitter, which is in sharp contrast to the conventional radio-frequency buncher technique. Our work not only leads to enhanced temporal resolution in electron-beam-based ultrafast instruments that may provide new opportunities in probing material systems far from equilibrium, but also opens a promising direction for advanced beam manipulation through self-field interactions.

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Beating the shot-noise limit

Cited by 20 publications

References 21 publications

Controlling nonlinear longitudinal space charge oscillations for high peak current bunch train generation

Controlling nonlinear longitudinal space charge oscillations for high peak current bunch train generation

Beam by design: Laser manipulation of electrons in modern accelerators

Coulomb-Driven Relativistic Electron Beam Compression

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