Effect of plasma density scale length on the properties of bremsstrahlung x-ray sources created by picosecond laser pulses

Courtois, Christian; Fontaine, Antoine; Landoas, O.; Lidove, G.; Méot, V.; Morel, Pierre; Nuter, R.; Lefebvre, E.; Boscheron, A.; Grenier, Jason R.; Aléonard, M. M.; Gerbaux, M.; Gobet, F.; Hannachi, F.; Malka, G.; Scheurer, J. N.; Tarisien, M.

doi:10.1063/1.3067825

Cited by 67 publications

(49 citation statements)

References 39 publications

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“…Laser-driven accelerators offer a cheaper and smaller alternative, and they are now capable of generating bursts of γ -rays10. γ -ray generation has been demonstrated in a number of experiments on laser interactions with solid and gas targets, where the main mechanism is the Bremsstrahlung radiation of fast electrons interacting with high-Z material targets11121314151617. However, due to the small bremsstrahlung cross-section, the conversion efficiency of this scheme is rather low.…”

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confidence: 99%

Brilliant petawatt gamma-ray pulse generation in quantum electrodynamic laser-plasma interaction

Chang

Qiao

Huang

et al. 2017

Sci Rep

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We show a new resonance acceleration scheme for generating ultradense relativistic electron bunches in helical motions and hence emitting brilliant vortical γ-ray pulses in the quantum electrodynamic (QED) regime of circularly-polarized (CP) laser-plasma interactions. Here the combined effects of the radiation reaction recoil force and the self-generated magnetic fields result in not only trapping of a great amount of electrons in laser-produced plasma channel, but also significant broadening of the resonance bandwidth between laser frequency and that of electron betatron oscillation in the channel, which eventually leads to formation of the ultradense electron bunch under resonant helical motion in CP laser fields. Three-dimensional PIC simulations show that a brilliant γ-ray pulse with unprecedented power of 6.7 PW and peak brightness of 1025 photons/s/mm2/mrad2/0.1% BW (at 15 MeV) is emitted at laser intensity of 1.9 × 1023 W/cm2.

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confidence: 99%

Brilliant petawatt gamma-ray pulse generation in quantum electrodynamic laser-plasma interaction

Chang

Qiao

Huang

et al. 2017

Sci Rep

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“…If a high-Z solid target is set behind the interaction zone, the relativistic electrons thus produced generate in turn an intense Bremsstrahlung emission upon slowing down and colliding in this radiator. [15][16][17][18] Such multi-MeV x-ray sources are used in various applications such as radiography of dense objects, 16,[19][20][21][22] photonuclear fission and activation, 15,[23][24][25] positron emission, [26][27][28] and also pose radiological constraints to the facilities. 29 The temporal and spatial characteristics of these sources are, respectively, in the few picosecond and few hundred micron ranges, significantly better than for the sources produced by electron induction accelerators, diodes, or rod pinches usually used for flash radiography.…”

Section: Introductionmentioning

confidence: 99%

Production of multi-MeV Bremsstrahlung x-ray sources by petawatt laser pulses on various targets

2012

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During the interaction of a high-intensity picosecond laser pulse with a plasma, a large amount of relativistic electrons are accelerated. If these electrons interact with a high-Z solid target, Bremsstrahlung photons are generated. This multi-MeV x-ray source may be used in various applications including radiography and photonuclear studies. The characteristics of such sources, produced with a petawatt laser interacting with different targets, are investigated numerically, using laser-plasma interaction and transport codes to model the relativistic electron acceleration and their transport in the conversion target, respectively. If the laser pulse interacts with a preplasma in front of a solid target, the on-axis dose first increases with preplasma scale-length, but then saturates and fluctuates, due to strong filamentation of the petawatt pulse. In an ionized gas jet, laser hosing reduces the electron emission along the propagation direction and thus the dose. For a capillary tube filled with plasma, the laser pulse is well confined along the axis and a net increase of the on-axis dose is obtained. The X-spot size obtained for these different cases varies from 20 μm to a few hundred microns.

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“…Previously, prior researches have mainly been focused on the radiation from electrons generated by laser-driven * Authors to whom correspondence should be addressed. Electronic mail: yi@uni-duesseldorf.de wakefield accelerators (LWFAs) [14][15][16] as well as hot electrons produced in interactions of high power laser and foils [17][18][19][20][21] or near-critical-density (NCD) plasmas [22][23][24]. However, although the x-ray source based on LWFA is more mature, the electron number produced by the LWFA is limited by the underdense plasma required for wakefield excitation, which further results in a relativelysmall photon yield.…”

Section: Introductionmentioning

confidence: 99%

Radiation from laser-microplasma-waveguide interactions in the ultra-intense regime

Pukhov

Shen

2016

Physics of Plasmas

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When a high-contrast ultra-relativistic laser beam enters a micro-sized plasma waveguide, the pulse energy is coupled into waveguide modes, which remarkably modifies the interaction of electrons and electromagnetic wave. The electrons that pulled out of walls form a dense helical bunch inside the channel are efficiently accelerated by the transverse magnetic modes to hundreds of MeVs. In the mean time, the asymmetry in the transverse electric and magnetic fields provides significant wiggling that leads to a bright, well-collimated emission of hard X-rays. In this paper, we present our study on the underlying physics in the aforementioned process using 3D particle-in-cell simulations. The mechanism of electron acceleration and the dependence of radiation properties on different laser plasma parameters are addressed. A theoretical analysis model and basic scalings for X-ray emission are also presented by considering the lowest optical modes in the waveguide, which is adequate to describe the basic observed phenomenon. In addition, the effects of high order modes as well as laser polarization are also qualitatively discussed. The considered X-ray source have promising features that might serve as a competitive candidate for future tabletop synchrotron source.

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Effect of plasma density scale length on the properties of bremsstrahlung x-ray sources created by picosecond laser pulses

Cited by 67 publications

References 39 publications

Brilliant petawatt gamma-ray pulse generation in quantum electrodynamic laser-plasma interaction

Brilliant petawatt gamma-ray pulse generation in quantum electrodynamic laser-plasma interaction

Production of multi-MeV Bremsstrahlung x-ray sources by petawatt laser pulses on various targets

Radiation from laser-microplasma-waveguide interactions in the ultra-intense regime

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