Generation of 20 kA electron beam from a laser wakefield accelerator

Li, Y. F.; Li, D. Z.; Huang, Kai; Tao, Mengze; Li, M. H.; Zhao, Jiarui; Ma, Y.; Guo, Xingming; Wang, J. G.; Chen, M.; Hafz, N.; Zhang, J.; Chen, L. M.

doi:10.1063/1.4975613

Cited by 43 publications

(35 citation statements)

References 46 publications

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“…Scaling the charge to the nanocoulomb range following original predictions 15 would yield hundreds of kiloamperes peak-current beams, the key component for next-generation compact light sources. During the submission of this manuscript, Li et al 20 demonstrated generation of electron beams up to 20 kA from laser wakefield acceleration yet of a continuous spectrum extending up to 0.6 GeV. Laser-plasma accelerators generating such high currents accumulate enough charge such that the self-fields of the bunch will superimpose on the wakefield 21 – 23 .…”

Section: Introductionmentioning

confidence: 99%

Demonstration of a beam loaded nanocoulomb-class laser wakefield accelerator

et al. 2017

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Laser-plasma wakefield accelerators have seen tremendous progress, now capable of producing quasi-monoenergetic electron beams in the GeV energy range with few-femtoseconds bunch duration. Scaling these accelerators to the nanocoulomb range would yield hundreds of kiloamperes peak current and stimulate the next generation of radiation sources covering high-field THz, high-brightness X-ray and γ-ray sources, compact free-electron lasers and laboratory-size beam-driven plasma accelerators. However, accelerators generating such currents operate in the beam loading regime where the accelerating field is strongly modified by the self-fields of the injected bunch, potentially deteriorating key beam parameters. Here we demonstrate that, if appropriately controlled, the beam loading effect can be employed to improve the accelerator’s performance. Self-truncated ionization injection enables loading of unprecedented charges of ∼0.5 nC within a mono-energetic peak. As the energy balance is reached, we show that the accelerator operates at the theoretically predicted optimal loading condition and the final energy spread is minimized.

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Section: Introductionmentioning

confidence: 99%

Demonstration of a beam loaded nanocoulomb-class laser wakefield accelerator

et al. 2017

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“…For the preservation of low normalized bunch emittance values as regarded here (ε n ¼ 0.2 mm mrad) [92], space-charge effects arising from large bunch charges [93] should be avoided. To circumvent this effect, a sufficiently low bunch charge of Q ¼ 10 pC was chosen for the simulations, an amount easily achievable by today's laser-plasma accelerators [94][95][96].…”

Section: Design Resultsmentioning

confidence: 99%

Design study for a compact laser-driven source for medical x-ray fluorescence imaging

Brümmer

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Pausch

et al. 2020

Phys. Rev. Accel. Beams

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Thomson scattering sources with their hard x-ray pencil beams represent a promising candidate to drive high-resolution X-ray Fluorescence Imaging (XFI). As XFI is a scanning imaging modality, it specifically requires pencil-beam geometries along with a high beam mobility. In combination with laser-wakefield acceleration (LWFA) such sources could provide the compactness needed for a future transition into clinical application. A sufficient flux within a small bandwidth could enable in-vivo high-sensitivity XFI for early cancer diagnostics and pharmacokinetic imaging. We thus report on a specific all-laser driven source design directed at increasing the photon number within the bandwidth and opening angle defined by XFI conditions. Typical parameters of driver lasers and electron bunches from LWFA are utilized and controlled within realistic parameter regions on the basis of appropriate beam optics. An active plasma lens is implemented for chromatic focal control of the bunch. Source performance limits are identified and compared to existing x-ray sources with regard to their potential to be implemented in future clinical XFI.

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“…of quasi-monoenergetic peak of electrons from bubble-regime LWFAs versus (a) peak energy Ee, and (b) charge Q within the peak, from 21 experiments using electron injection methods depicted schematically in right-hand column: selfinjection, filled gold circles (Faure et al, 2004;Gallacher et al, 2009;Kim et al, 2013a;Kneip et al, 2009;Leemans et al, 2006;Li et al, 2017;Mangles et al, 2004;Osterhoff et al, 2008;Wang et al, 2013); colliding pulses, green stars (Faure et al, 2006;Rechatin et al, 2009); single shock-induced density ramp, filled blue squares (Buck et al, 2013;Khrennikov et al, 2015a;Schmid et al, 2010;Swanson et al, 2017); tailored multi-ramp, open black (Gonsalves et al, 2011) and filled black (Wang et al, 2016) triangles;ionization-induced, open red (McGuffey et al, 2010;Pak et al, 2010) and filled red (Couperus et al, 2017;Mirzaie et al, 2015;Pollock et al, 2011) diamonds. Plotted ∆E…”

Section: Charge and Energy Spreadmentioning

confidence: 99%

Diagnostics for plasma-based electron accelerators

et al. 2018

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Plasma-based accelerators that impart energy gain as high as several GeV to electrons or positrons within a few centimeters have engendered a new class of diagnostic techniques very different from those used in connection with conventional radio-frequency (RF) accelerators. The need for new diagnostics stems from the micrometer scale and transient, dynamic structure of plasma accelerators, which contrasts with the meter scale and static structure of conventional accelerators. Because of this micrometer source size, plasma-accelerated electron bunches can emerge with smaller normalized transverse emittance (n < 0.1 mm mrad) and shorter duration (τ b ∼ 1 fs) than bunches from RF linacs. We review single-shot diagnostics that determine such small n and τ b non-invasively and with high resolution from wide-bandwdith spectral measurement of electromagnetic radiation the electrons emit: n from x-rays emitted as electrons interact with transverse internal fields of the plasma accelerator or with external optical fields or undulators; τ b from THz to optical coherent transition radiation emitted upon traversing interfaces. The duration of ∼ 1 fs bunches can also be measured by sampling individual cycles of a co-propagating optical pulse or by measuring the associated magnetic field using a transverse probe pulse. Because of their luminal velocity and micrometer size, the evolving structure of plasma accelerators, the key determinant of accelerator performance, is exceptionally challenging to visualize in the laboratory. Here we review a new generation of laboratory diagnostics that yield snapshots, or even movies, of laser-and particle-beam-generated plasma accelerator structures based on their phase modulation or deflection of femtosecond electromagnetic or electron probe pulses. We discuss spatiotemporal resolution limits of these imaging techniques, along with insights into plasma-based acceleration physics that have emerged from analyzing the images, and comparing them to simulated plasma structures. CONTENTS I.Introduction 1 II. Properties of plasma accelerator structures and beams 3 A. General properties of plasma electron accelerators 3 1. Frequency-domain holography 41 2. Longitudinal optical shadowgraphy 45 3. Transverse optical probing 46 4. Electron radiography 48 D. "Movies" of wake evolution 49 1. Multi-shot transverse probes 49 2. Single-shot frequency-domain streak camera 50 3. Single-shot imaging of meter-long wakes 52 E. Scaling of wake probes with plasma density 54 V. Conclusion 55 References 58

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Generation of 20 kA electron beam from a laser wakefield accelerator

Cited by 43 publications

References 46 publications

Demonstration of a beam loaded nanocoulomb-class laser wakefield accelerator

Demonstration of a beam loaded nanocoulomb-class laser wakefield accelerator

Design study for a compact laser-driven source for medical x-ray fluorescence imaging

Diagnostics for plasma-based electron accelerators

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