Parametric study of high-energy ring-shaped electron beams from a laser wakefield accelerator

Abstract Laser wakefield accelerators commonly produce on-axis, low-divergence, high-energy electron beams. However, a high charge, annular shaped beam can be trapped outside the bubble and accelerated to high energies. Here we present a parametric study on the production of low-energy-spread, ultra-relativistic electron ring beams in a two-stage gas cell. Ring-shaped beams with energies higher than 750 MeV are observed simultaneously with on axis, continuously injected electrons. Often multiple ring shaped beams with different energies are produced and parametric studies to control the generation and properties of these structures were conducted. Particle tracking and particle-in-cell simulations are used to determine properties of these beams and investigate how they are formed and trapped outside the bubble by the wake produced by on-axis injected electrons. These unusual femtosecond duration, high-charge, high-energy, ring electron beams may find use in beam driven plasma wakefield accelerators and radiation sources.

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Coupling Effects in Multistage Laser Wake-field Acceleration of Electrons

Scientific Reports ◽

10.1038/s41598-019-56654-x ◽

2019 ◽

Vol 9 (1) ◽

Cited By ~ 2

Author(s):

Zhan Jin ◽

Hirotaka Nakamura ◽

Naveen Pathak ◽

Yasuo Sakai ◽

Alexei Zhidkov ◽

...

Keyword(s):

Laser Pulse ◽

Electron Beams ◽

High Energy ◽

Long Distance ◽

Plasma Cathode ◽

Particle In Cell ◽

Wake Field ◽

Spatial Coupling ◽

Electron Bunches ◽

A Charge

AbstractStaging laser wake-field acceleration is considered to be a necessary technique for developing full-optical jitter-free high energy electron accelerators. Splitting of the acceleration length into several technical parts and with independent laser drivers allows not only the generation of stable, reproducible acceleration fields but also overcoming the dephasing length while maintaining an overall high acceleration gradient and a compact footprint. Temporal and spatial coupling of pre-accelerated electron bunches for their injection in the acceleration phase of a successive laser pulse wake field is the key part of the staging laser-driven acceleration. Here, characterization of the coupling is performed with a dense, stable, narrow energy band of <3% and energy-selectable electron beams with a charge of ~1.6 pC and energy of ~10 MeV generated from a laser plasma cathode. Cumulative focusing of electron bunches in a low-density preplasma, exhibiting the Budker–Bennett effect, is shown to result in the efficient injection of electrons, even with a long distance between the injector and the booster in the laser pulse wake. The measured characteristics of electron beams modified by the booster wake field agree well with those obtained by multidimensional particle-in-cell simulations.

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High-resolution sampling of beam-driven plasma wakefields

Nature Communications ◽

10.1038/s41467-020-19811-9 ◽

2020 ◽

Vol 11 (1) ◽

Cited By ~ 1

Author(s):

S. Schröder ◽

C. A. Lindstrøm ◽

S. Bohlen ◽

G. Boyle ◽

R. D’Arcy ◽

...

Keyword(s):

Electric Fields ◽

High Energy ◽

Acceleration Process ◽

Plasma Parameters ◽

Particle Beams ◽

Particle In Cell ◽

Precise Control ◽

Plasma Wakefield Accelerators ◽

Plasma Wakefield ◽

Good Agreement

AbstractPlasma-wakefield accelerators driven by intense particle beams promise to significantly reduce the size of future high-energy facilities. Such applications require particle beams with a well-controlled energy spectrum, which necessitates detailed tailoring of the plasma wakefield. Precise measurements of the effective wakefield structure are therefore essential for optimising the acceleration process. Here we propose and demonstrate such a measurement technique that enables femtosecond-level (15 fs) sampling of longitudinal electric fields of order gigavolts-per-meter (0.8 GV m−1). This method—based on energy collimation of the incoming bunch—made it possible to investigate the effect of beam and plasma parameters on the beam-loaded longitudinally integrated plasma wakefield, showing good agreement with particle-in-cell simulations. These results open the door to high-quality operation of future plasma accelerators through precise control of the acceleration process.

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High-flux electron beams from laser wakefield accelerators driven by petawatt lasers

Plasma Science and Technology ◽

10.1088/2058-6272/aa6437 ◽

2017 ◽

Vol 19 (7) ◽

pp. 070502 ◽

Cited By ~ 1

Author(s):

Ming ZENG ◽

Ovidiu TESILEANU

Keyword(s):

Electron Beams ◽

High Flux ◽

Laser Wakefield ◽

Wakefield Accelerators

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High-energy electron beams produced by a Laser Wakefield accelerator

2012 Abstracts IEEE International Conference on Plasma Science ◽

10.1109/plasma.2012.6383996 ◽

2012 ◽

Author(s):

C. Lopes ◽

C. Russo ◽

R. A. Bendoyro ◽

J. Jiang ◽

J. M. Dias ◽

...

Keyword(s):

Electron Beams ◽

High Energy ◽

Energy Electron ◽

High Energy Electron ◽

Laser Wakefield ◽

Wakefield Accelerator ◽

Laser Wakefield Accelerator

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Plasma guiding using a chaperone pre-pulse for stable wakefield generation

10.21203/rs.3.rs-679840/v1 ◽

2021 ◽

Author(s):

Devki Nandan Gupta ◽

Samuel Robert Yoffe ◽

Arohi Jain ◽

Bernhard Ersfeld ◽

Dino Anthony Jaroszynski

Keyword(s):

Laser Pulse ◽

Laser Pulses ◽

Space Distribution ◽

Essential Step ◽

Self Focusing ◽

Radiation Sources ◽

High Intensity Laser ◽

Laser Wakefield ◽

Intensity Laser ◽

Wakefield Accelerators

Abstract Achieving high quality electron beams in laser wakefield accelerators requires stable guiding of the intense driving laser pulse, which is challenging because of mode mismatching due to relativistic self-focusing. Here we show how an intense pre-pulse can be used to prepare the phase-space distribution of plasma electrons encountered by a trailing laser pulse so that it produces its own well-matched guiding channel, while minimising wakefield evolution. Controlling the propagation of high intensity laser pulses is an essential step in developing useful wakefield accelerators and compact radiation sources.

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