Single-Shot Coherent Diffraction Imaging of Microbunched Relativistic Electron Beams for Free-Electron Laser Applications

Marinelli, Agostino; Dunning, M.; Weathersby, Stephen; Hemsing, E.; Xiang, Dao; Andonian, G.; O'Shea, Finn; Miao, Jianwei; Hast, C.; Rosenzweig, James

doi:10.1103/physrevlett.110.094802

Cited by 18 publications

(15 citation statements)

References 26 publications

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“…Camera 2 (EFL 10.8 cm) recorded the far-field profile distribution with the focus set to infinity. The pair of intensity profile images (Figure 2A and 2C) was then processed with an iterative phase retrieval algorithm [26]. Similar to standard techniques, this routine exploits the defocus variation and Fourier-transformation properties of transport between image planes to reconstruct the phase from the known intensities [27].…”

Section: Experiments and Methodsmentioning

confidence: 99%

Coherent optical vortices from relativistic electron beams

et al. 2013

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Recent advances in the production and control of high-brightness electron beams (e-beams) have enabled a new class of intense light sources based on the free electron laser (FEL) that can examine matter atÅngstrom length and femtosecond time scales. The free, or unbound, electrons act as the lasing medium, which provides unique opportunities to exquisitely control the spatial and temporal structure of the emitted light through precision manipulation of the electron distribution. We present an experimental demonstration of light with orbital angular momentum (OAM) generated from a relativistic e-beam rearranged into an optical scale helix by a laser. With this technique, we show that a Gaussian laser mode can be effectively up-converted to an OAM mode in an FEL using only the e-beam as a mode-convertor. Results confirm theoretical predictions, and pave the way for the production of coherent OAM light with unprecedented brightness down to hard x-ray wavelengths for wide ranging applications in modern light sources.

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Section: Experiments and Methodsmentioning

confidence: 99%

Coherent optical vortices from relativistic electron beams

et al. 2013

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“…The fluctuation due to the shot noise can be, in principle, suppressed by increasing the exposure time or radiation intensity; however, the intense x-ray radiation [10] can also damage the vulnerable bio-samples [11,12]. Through using single-shot schemes, such as the diffractand-destroy experiments, Chapman and his coworkers [3,10,[13][14][15] showed that a bio-sample can be imaged under the illumination of a high-intensity free electron laser (FEL) [16][17][18]. However, noise still serves as a major obstacle for high fidelity reconstruction of the structures.…”

Section: Introductionmentioning

confidence: 99%

Method to enhance the resolution of x-ray coherent diffraction imaging for non-crystalline bio-samples

Lan

Lee

2014

New J. Phys.

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To circumvent the problem of radiation damage when using an x-ray coherent diffraction imaging experiment to resolve the structure of biological samples, we propose a method to add objects made of heavy atoms with the bio-samples or we load the samples on a template made of heavy atoms. This template method is shown by a numerical simulation (including shot noise) to be able to resolve the structure of a virus better than without the template. A counter-intuitive result is obtained, where heavier templates have a better resolution, even if the diffraction intensity of the bio-sample is much smaller than the noise intensity. In addition, the method also helps to greatly increase the efficiency of phase retrieval. We also provide a way to estimate the error to be expected if a particular experimental setting were chosen once the charge ratio between the sample and the template is estimated. Hence, this method will also help experiments choose the optimal setting for the best resolution with minimal radiation damage.

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“…A number of experimental analyses of the instability have been published, using coherent optical transition radiation (COTR) [28][29][30][31][32][33] , measuring its influence on FEL intensity and gain length 24,34 , and by direct measurements of the longitudinal phase space 3,[35][36][37][38] . This final method of analysis is particularly useful for benchmarking both simulation codes and analytic models which describe the development of the instability.…”

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confidence: 99%

Characterisation of microbunching instability with 2D Fourier analysis

Brynes

Akkermans

Allaria

et al. 2020

Sci Rep

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The optimal performance of high-brightness free-electron lasers (FELs) is limited by the microbunching instability, which can cause variations in both the slice energy spread and longitudinal profile of electron beams. In this paper, we perform 2D Fourier analysis of the full bunch longitudinal phase space, such that modulations in both planes can be studied simultaneously. Unlike the standard 1D analysis, this method is able to reveal modulations in a folded phase space, which would otherwise remain uncovered. Additionally, the plasma oscillation between energy and density modulations is also revealed by this method. The damping of the microbunching instability, through the use of a laser heater, is also analysed with this technique. We confirm a mitigation of the amplitude of modulation and a red-shift of the microbunching frequency as the energy spread added increases. As an outcome of this work, a systematic experimental comparison of the development of the instability in the presence of different compression schemes is here presented for the first time.

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Single-Shot Coherent Diffraction Imaging of Microbunched Relativistic Electron Beams for Free-Electron Laser Applications

Cited by 18 publications

References 26 publications

Coherent optical vortices from relativistic electron beams

Coherent optical vortices from relativistic electron beams

Method to enhance the resolution of x-ray coherent diffraction imaging for non-crystalline bio-samples

Characterisation of microbunching instability with 2D Fourier analysis

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