Multi-GeV Electron Beams from Capillary-Discharge-Guided Subpetawatt Laser Pulses in the Self-Trapping Regime

Leemans, W.P.; Gonsalves, A. J.; Mao, Hann-Shin; Nakamura, Kei; Benedetti, C.; Schroeder, C. B.; Tóth, Cs.; Daniëls, J.; Mittelberger, D. E.; Bulanov, S. S.; Vay, Jean‐Luc; Geddes, C. G. R.; Esarey, E.

doi:10.1103/physrevlett.113.245002

Cited by 849 publications

(513 citation statements)

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“…The electron bunch to be accelerated in LWFA can either be directly extracted from the plasma (through the so called self-injection process) or can be externally injected [5]. A net energy gain of the electron bunch in a single stage up to 4 GeV [6] has already been shown. Moreover the possibility of staging this acceleration process has recently been experimentally demonstrated [7].…”

Section: Introductionmentioning

confidence: 99%

Conceptual and Technical Design Aspects of Accelerators for External Injection in LWFA

et al. 2018

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Laser driven Wake-Field Acceleration (LWFA) has proven its capability of accelerating electron bunches (e-bunches) to up to 4 GeV energy in a single stage while reaching gradients up to hundreds of GV/m. Because of the short period of the accelerating field (typically ranging from 100 fs to 1 ps duration) and the requirement of extremely small beam size (typically smaller than 1 µm) to match the channel, e-bunches can reach extremely high densities. They can be either extracted directly from the plasma or externally injected. The study of the external injection is interesting for two main reasons. On the one hand this method allows better control of the quality of the input beam and on the other hand it is in general necessary when a staged approach of the accelerator is considered. The interest in producing, characterizing and transporting high brightness ultra-short e-bunches has grown together with the interest in LWFA and other novel high-gradient acceleration techniques. In this paper we will review the principal techniques for producing and shaping ultra-short electron bunches with the example of the SINBAD-ARES (Accelerator Research Experiment at SINBAD) linac at the Deutsches Elektronen-Synchrotron (DESY). Our goal is to show how the design of the SINBAD-ARES linac satisfies the requirements for generating high brightness LWFA probes. In the last part of the paper we shall also comment on the technical challenges for electron control and characterization.

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Section: Introductionmentioning

confidence: 99%

Conceptual and Technical Design Aspects of Accelerators for External Injection in LWFA

et al. 2018

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“…Using direct electron acceleration in sub-mm scale accelerating structures, electron acceleration has been demonstrated but for limited charge [10], [11]. Plasma driven accelerators have shown record acceleration of electrons to 4.2 GeV, yet these facilities are bound to operate at low repetition rate and currently suffer from shot-to-shot reproducibility [12]. Another approach -that our group is pursuing -consists of accelerating electrons using THz frequency radiation generated from frequency down-converting state-of-the-art NIR lasers [13].…”

Section: Introductionmentioning

confidence: 99%

Frequency-shifted sources for terahertz-driven linear electron acceleration

Hemmer

Cirmi

Ravi

et al. 2018

Nonlinear Frequency Generation and Conversion: Materials and Devices XVII

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The generation of THz-frequency radiation via nonlinear parametric frequency down-conversion has long been driven by the spectroscopy and imaging communities. As a result, little efforts have been undertaken toward the generation of high energy THz-frequency pulses. THz-frequency radiation has however recently been identified has a promising driver for strong-field physics and an emerging generation of compact particle accelerators. These accelerators require THzfrequency pulses with energies in the multi-millijoule range therefore demanding orders of magnitude improvements from the current state-of-the-art. Much can be gained by improving the intrinsically low efficiency of the down-conversion process while still resorting to existing state-of-the-art lasers. However, the fundamental Manley-Rowe limit caps the efficiency of parametric downconversion from 1-µm wavelength lasers to sub-THz frequency to the sub-percent range. We present methods that promise boosting the THz radiation yield obtained via parametric down-conversion beyond the Manley-Rowe limit. Our method relies on cascaded nonlinear three-wave mixing between two spectrally neighboring laser pulses in periodically poled Lithium Niobate. Owing to favorable phase-matching, the down-conversion process avalanches, resulting in spectral broadening in the optical domain. This allows in-situ coherent multiplexing of multiple parametric down-conversion stages within a single device and boosting the efficiency of the process beyond the ManleyRowe limit. We experimentally demonstrated the concept using either broadband, spectrally chirped optical pulses from a Joule-class laser or using two narrowband lasers with neighboring wavelengths. Experimental results are backed by numerical simulations that predict conversion efficiencies from 1 µm to sub-THz radiation in the multi-percent range.

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“…INF&RNO includes nonlinear laser evolution (e.g., relativistic self-focusing, ionization defocusing) and was used to simulate the ionizing laser's propagation through the neutral gas target and resulting blueshifting. This simulation code has been validated by extensive comparison with experiments [20][21][22][23][24] and is widely used to model the laser-plasma interaction at BELLA. The propagation of an intense laser through an ionizing target is simulated for a range of temporal profiles, resulting in a map of spectral blueshifting as a function of diffraction grating spacing.…”

Section: Numerical Simulation Of Experimental Setup and Blueshiftingmentioning

confidence: 99%

Characterization of the spectral phase of an intense laser at focus via ionization blueshift

et al. 2016

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An in-situ diagnostic for verifying the spectral phase of an intense laser pulse at focus is presented. This diagnostic relies on measuring the effect of optical compression on ionization-induced blueshifting of the laser spectrum. Experimental results from the Berkeley Lab Laser Accelerator (BELLA), a laser source rigorously characterized by conventional techniques, are presented and compared with simulations to illustrate the utility of this technique. These simulations show distinguishable effects from second, third, and fourth order spectral phase.

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Multi-GeV Electron Beams from Capillary-Discharge-Guided Subpetawatt Laser Pulses in the Self-Trapping Regime

Cited by 849 publications

References 27 publications

Conceptual and Technical Design Aspects of Accelerators for External Injection in LWFA

Conceptual and Technical Design Aspects of Accelerators for External Injection in LWFA

Frequency-shifted sources for terahertz-driven linear electron acceleration

Characterization of the spectral phase of an intense laser at focus via ionization blueshift

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