Resonantly Enhanced Betatron Hard X-rays from Ionization Injected Electrons in a Laser Plasma Accelerator

Huang, Kai; Li, Y. F.; Li, D. Z.; Chen, L. M.; Tao, Mengze; Ma, Y.; Zhao, Jiarui; Li, M. H.; Chen, M.; Mirzaie, Maryam; Hafz, N.; Sokollik, Thomas; Sheng, Zheng-Ming; Zhang, J.

doi:10.1038/srep27633

Cited by 35 publications

(14 citation statements)

References 43 publications

(84 reference statements)

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“…The effect of microbunching can be understood as a forced betatron resonance. Contrary to previous cases with the modulation by the tail of the plasma wave drive pulse 23,25 , where the electron beam experiences a long acceleration period before it catches the laser pulse which resulting in limited controllability of the X-ray source, we reach the betatron resonance immediately from the moment of injection.…”

Section: Resultsmentioning

confidence: 67%

“…Several recent studies suggest methods for enhancing betatron radiation emission, mostly based on the increase of the betatron oscillation amplitude. This can be achieved by an axial magnetic field, either self-generated or external 17 , 18 ; by a delayed modulation laser pulse 19 ; by the interaction of the electron beam with a high intensity optical lattice formed by the superposition of two transverse laser pulses 20 ; by using structured laser pulses 21 ; or by the interaction of electrons with the tail of the plasma wave drive pulse 22 – 25 .…”

Section: Introductionmentioning

confidence: 99%

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Attosecond betatron radiation pulse train

Horný

Krůs

Yan

et al. 2020

Sci Rep

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High-intensity X-ray sources are essential diagnostic tools for science, technology and medicine. Such X-ray sources can be produced in laser-plasma accelerators, where electrons emit short-wavelength radiation due to their betatron oscillations in the plasma wake of a laser pulse. Contemporary available betatron radiation X-ray sources can deliver a collimated X-ray pulse of duration on the order of several femtoseconds from a source size of the order of several micrometres. In this paper we demonstrate, through particle-in-cell simulations, that the temporal resolution of such a source can be enhanced by an order of magnitude by a spatial modulation of the emitting relativistic electron bunch. The modulation is achieved by the interaction of the that electron bunch with a co-propagating laser beam which results in the generation of a train of equidistant sub-femtosecond X-ray pulses. The distance between the single pulses of a train is tuned by the wavelength of the modulation laser pulse. The modelled experimental setup is achievable with current technologies. Potential applications include stroboscopic sampling of ultrafast fundamental processes.

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Section: Resultsmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Attosecond betatron radiation pulse train

Horný

Krůs

Yan

et al. 2020

Sci Rep

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“…Moreover, betatron radiation intensity and critical photon energy can be enhanced when accelerated electrons interact with the laser pulse resulting in betatron resonance. 7,44 These novel radiation sources are of interest for advancing photon-based applications.…”

Section: Application Programmesmentioning

confidence: 99%

Application programmes at the Scottish Centre for the Application of Plasma-based Accelerators (SCAPA)

Wiggins

Boyd

Brunetti

et al. 2019

Relativistic Plasma Waves and Particle Beams as Coherent and Incoherent Radiation Sources III

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The Scottish Centre for the Application of Plasma-based Accelerators (SCAPA) is a research facility dedicated to providing high energy particle beams and high peak brightness radiation pulses for users across a wide range of scientific and engineering disciplines. A pair of Ti:sapphire femtosecond laser systems (40 TW peak power at 10 Hz pulse repetition rate and 350 TW at 5 Hz, respectively) are the drivers for a suite of laser-plasma accelerator beamlines housed across a series of radiation shielded areas. The petawatt-scale laser delivers 45 W of average power, which has established it as a world leader in its class. The University of Strathclyde has had an operational laser wakefield accelerator since 2007 as the centrepiece of the ongoing Advanced Laser Plasma High-energy Accelerators towards X-rays (ALPHA-X) project. SCAPA, which is a multi-partner venture supported by the Scottish Universities Physics Alliance, continues the dedicated beamline approach pioneered by ALPHA-X and represents a significant expansion in the UK's experimental capability at the university level in laser-driven acceleration. The new centre supports seven dedicated radiation beamlines across three shielded bunkers that each nominally specialise in different aspects of fundamental laser-plasma interaction physics and radiation sources: GeV-scale electron beams, MeV proton and ion beams, X-rays, gamma rays etc. Development of application programmes based on these sources cover a wide range of fields including nuclear physics, radiotherapy, space radiation reproduction, warm dense matter, high field physics and radioisotope generation.

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“…Quasimonoenergetic electron beams with energies over GeV [5][6][7][8][9][10], relative energy spread of 0.4% [11], peak current over kA [12][13][14] or repetition rate up to 1 kHz [15,16] have been reported by the interaction of intense femtosecond laser pulses with low density gas targets over mm ∼cm distances. This compact acceleration regime is considered promising for the construction of table-top ultrafast x-ray sources [17][18][19][20][21][22] with greater accessibility and lower cost than state of the art light sources driven by conventional accelerators.…”

Section: Introductionmentioning

confidence: 99%

Variation in electron emission time in weakly nonlinear laser wakefield acceleration

Huang

Kotaki

Mori

et al. 2019

Phys. Rev. Accel. Beams

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As an advanced accelerator concept, laser wakefield acceleration, with its attractive acceleration gradient, has invoked great interest worldwide. The electron beams from laser wakefield acceleration were assumed to have the advantage of "jitterfree" or relatively small jitter, since the emergence of quasimonoenergetic bunch structures were considered to result from the trapping of electrons into the first bucket of the plasma wave. However, the emission times of the electron bunches from laser wakefield acceleration have not been real time monitored in experiments up to now. To examine this, we introduced the electro-optic spatial decoding method. The relative emission times of the electrons were observed to have variations with different plasma densities when using a laser with moderate intensity. The study shows that timing issues should not be ignored in some occasions of laser wakefield acceleration. The method used in this paper could be a candidate serving as a single-shot nondestructive electron bunch timing monitor for laser wakefield experiment and potential ultrafast pump-probe studies.

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Resonantly Enhanced Betatron Hard X-rays from Ionization Injected Electrons in a Laser Plasma Accelerator

Cited by 35 publications

References 43 publications

Attosecond betatron radiation pulse train

Attosecond betatron radiation pulse train

Application programmes at the Scottish Centre for the Application of Plasma-based Accelerators (SCAPA)

Variation in electron emission time in weakly nonlinear laser wakefield acceleration

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