Laser based synchrotron radiation

Phuoc, K. Ta; Burgy, F.; Rousseau, Jean‐Philippe; Malka, Victor; Rousse, A.; Shah, Rahul; Umstadter, Donald; Pukhov, A.; Kiselev, S. I.

doi:10.1063/1.1842755

Cited by 87 publications

(72 citation statements)

References 27 publications

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“…The technical simplicity and compactness of these laser-plasma accelerators (LPAs) is attractive for a broad range of applications, such as nuclear activation and on-site isotope production (Leemans et al 2001;Reed et al 2007), long-distance probing of defects in shielded structures (Ramanathan et al 2010), and testing radiation resistivity of electronic components (Hidding et al 2011). Realisation of compact, inexpensive, bright x-and gamma-ray sources using electron beams from LPAs (Rousse et al 2004Ta Phuoc et al 2005;Kneip et al 2010;Cipiccia et al 2011) holds the promise to enable a much wider user community than can be served by existing largescale facilities. These applications are not especially demanding as regards electron beam quality, and in fact sometimes draw benefits from poor beam collimation and a broad energy spectrum (Hidding et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Computationally efficient methods for modelling laser wakefield acceleration in the blowout regime

Cowan¹,

Kalmykov

Beck

et al. 2012

J. Plasma Phys.

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Electron self-injection and acceleration until dephasing in the blowout regime is studied for a set of initial conditions typical of recent experiments with 100 terawatt-class lasers. Two different approaches to computationally efficient, fully explicit, three-dimensional particle-in-cell modelling are examined. First, the Cartesian code vorpal (Nieter & Cary 2004) using a perfect-dispersion electromagnetic solver precisely describes the laser pulse and bubble dynamics, taking advantage of coarser resolution in the propagation direction, with a proportionally larger time step. Using third-order splines for macroparticles helps suppress the sampling noise while keeping the usage of computational resources modest. The second way to reduce the simulation load is using reduced-geometry codes. In our case, the quasi-cylindrical code calder-circ (Lifschitz et al. 2009) uses decomposition of fields and currents into a set of poloidal modes, while the macroparticles move in the Cartesian 3D space. Cylindrically symmetry of the interaction allow using just two modes, reducing the computational load to roughly that of a planar Cartesian simulation while preserving the 3D nature of the interaction. This significant economy of resources allows using fine resolution in the direction of propagation and a small time step, making numerical dispersion vanishingly small, together with a large number of particles per cell, enabling good particle statistics. Quantitative agreement of the two simulations indicates that they are free of numerical artefacts. Both approaches thus retrieve physically correct evolution of the plasma bubble, recovering the intrinsic connection of electron self-injection to the nonlinear optical evolution of the driver.

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Section: Introductionmentioning

confidence: 99%

Computationally efficient methods for modelling laser wakefield acceleration in the blowout regime

Cowan¹,

Kalmykov

Beck

et al. 2012

J. Plasma Phys.

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“…Synchrotron radiation from an LWFA was demonstrated experimentally and has been intensely studied by Rousse and co-workers [95,[101][102][103][104]. The time duration of LWFA synchrotron x-rays was found to be as short as 100 fs.…”

Section: Coulomb In a Very Short Time Duration ( Plasma Period ∼ 10 Fmentioning

confidence: 95%

Control of Laser Plasma Based Accelerators up to 1 GeV

Nakamura

2007

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This dissertation documents the development of a broadband electron spectrometer (ESM) for GeV class Laser Wakefield Accelerators (LWFA), the production of high quality GeV electron beams (e-beams) for the first time in a LWFA by using a capillary discharge guide (CDG), and a statistical analysis of CDG-LWFAs.An ESM specialized for CDG-LWFAs with an unprecedentedly wide momentum acceptance, from 0.01 to 1.1 GeV in a single shot, has been developed. Simultaneous measurement of e-beam spectra and output laser properties as well as a large angular acceptance (> ±10 mrad) were realized by employing a slitless scheme. A scintillating screen (LANEX Fast back ,LANEX-FB) -camera system allowed faster than 1 Hz operation and evaluation of the spatial properties of e-beams. The design provided sufficient resolution for the whole range of the ESM (below 5% for beams with 2 mrad divergence).The calibration between light yield from LANEX-FB and total charge, and a study on the electron energy dependence (0.071 to 1.23 GeV) of LANEX-FB were performed at the Advanced light source (ALS), Lawrence Berkeley National Laboratory (LBNL). Using this calibration data, the developed ESM provided a charge measurement as well.The production of high quality electron beams up to 1 GeV from a centimeter-scale ii accelerator was demonstrated. The experiment used a 310 µm diameter gas-filled capillary discharge waveguide that channeled relativistically-intense laser pulses (42 TW, A statistical analysis of the CDG-LWFAs' performance was carried out. By taking advantage of the high repetition rate experimental system, several thousands of shots were taken in a broad range of the laser and plasma parameters. An analysis program was developed to sort and select the data by specified parameters, and then to evaluate performance statistically.The analysis suggested that the generation of GeV-level beams comes from a highly unstable and regime. By having the plasma density slightly above the threshold density for self injection, 1) the longest dephasing length possible was provided, which led to the generation of high energy e-beams, and 2) the number of electrons injected into the wakefield was kept small, which led to the generation of high quality (low energy spread) e-beams by minimizing the beam loading effect on the wake. The analysis of the stable half-GeV beam regime showed the requirements for stable self injection and acceleration. A small change of discharge delay t dsc , and input energy E in , significantly affected performance.The statistical analysis provided information for future optimization, and suggested possible schemes for improvment of the stability and higher quality beam generation. A CDG-LWFA is envisioned as a construction block for the next generation accelerator, enabling significant cost and size reductions.

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“…Nous avons développé au LOA [11,12] une nouvelle source de rayons X basé sur l'interaction laserplasma en régime relativiste, qui reprend le concept d'accélération et d'oscillation d'électrons, mais dans un plasma de quelques millimètres.…”

Section: Introductionunclassified

Microsynchrotron

et al. 2006

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Résumé. Grâce aux progrès réalisés sur les chaînes laser ultra intenses, il est maintenant possible de produire des faisceaux de rayons X par interaction laser-plasma en utilisant un laser ultra bref. De plus, cette source est polychromatique et de durée femtoseconde, ce qui ouvre la voie vers de nombreuses applications. Lorsqu'un laser intense (50TW, 30fs) est focalisé sur le front avant d'un jet d'hélium, des électrons sont piégés dans le sillage de l'impulsion laser et ensuite accélérés pour enfin osciller dans le plasma lui même. Comme dans un synchrotron, un faisceau X de faible divergence est produit par ces oscillations électroniques. Après avoir présenté le principe de cette source, nous montrons les derniers résultats obtenus pour sa caractérisation spatiale et spectrale, ainsi que la corrélation entre le faisceau d'électrons et de rayons X produits par ce procédé.

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Laser based synchrotron radiation

Cited by 87 publications

References 27 publications

Computationally efficient methods for modelling laser wakefield acceleration in the blowout regime

Computationally efficient methods for modelling laser wakefield acceleration in the blowout regime

Control of Laser Plasma Based Accelerators up to 1 GeV

Microsynchrotron

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