Laser pulse propagation and enhanced energy coupling to fast electrons in dense plasma gradients

Gray, R. J.; Carroll, D. C.; Yuan, Xiaohui; Brenner, C. M.; Burza, Matthias; Coury, M.; Lancaster, K. L.; Lin, Xiaona; Li, Y. T.; Neely, D.; Quinn, M. N.; Tresca, O.; Wahlström, Claes‐Göran; McKenna, P.

doi:10.1088/1367-2630/16/11/113075

Cited by 31 publications

(30 citation statements)

References 30 publications

(39 reference statements)

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“…a relativistically-induced transparency regime, has been previously demonstrated by PIC simulations [43]. In the present paper we not only took into account the effect of the relativistically induced transparency (details of which can be found in paper [44]) on the resonance condition, but also confirmed that the L-dips originate from the region of the relativistic critical density (which is greater than the nonrelativistic critical density), as shown in the next section.…”

Section: Brief Theory Of Langmuir-wave-caused Dips In Spectral Line Psupporting

confidence: 81%

Using X-ray spectroscopy of relativistic laser plasma interaction to reveal parametric decay instabilities: a modeling tool for astrophysics

et al. 2017

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Article:Oks, E., Dalimier, E., Faenov, A. Ya et al. (16 more authors) (2017) Using X-ray spectroscopy of relativistic laser plasma interaction to reveal parametric decay instabilities : A modeling tool for astrophysics. Optics Express. pp. 1958-1972. ISSN 1094 https://doi.org/10.1364/OE.25.001958 eprints@whiterose.ac.uk https://eprints.whiterose.ac.uk/ Reuse Items deposited in White Rose Research Online are protected by copyright, with all rights reserved unless indicated otherwise. They may be downloaded and/or printed for private study, or other acts as permitted by national copyright laws. The publisher or other rights holders may allow further reproduction and re-use of the full text version. This is indicated by the licence information on the White Rose Research Online record for the item. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request.Using X-ray spectroscopy of relativistic laser plasma interaction to reveal parametric decay instabilities: a modeling tool for astrophysics faenov.anatoly@photon.osaka-u.ac.jp Abstract: By analyzing profiles of experimental x-ray spectral lines of Si XIV and Al XIII, we found that both Langmuir and ion acoustic waves developed in plasmas produced via irradiation of thin Si foils by relativistic laser pulses (intensities ~10 21 W/cm 2 ). We prove that these waves are due to the parametric decay instability (PDI). This is the first time that the PDI-induced ion acoustic turbulence was discovered by the x-ray spectroscopy in laserproduced plasmas. These conclusions are also supported by PIC simulations. Our results can be used for laboratory modeling of physical processes in astrophysical objects and a better understanding of intense laser-plasma interactions. A. Pikuz, V. M. Romanova, and T. A. Shelkovenko, "High-performance X-ray spectroscopic devices for plasma microsources investigations," Phys. Scr. 50(4), 333-338 (1994 1122-1127 (1981). 39. P. Maine, D. Strickland, P. Bado, M. Pessot, and G. Mourou, "Generation of ultrahigh peak power pulses by chirped pulse amplification," IEEE J. Quantum Electron. 24(2), 398-403 (1988). 40. A. I. Akhiezer and R. V. Polovin, "Theory of wave motion of an electron plasma," Sov. Phys. JETP 3, 696-705 (1956). 41. W. Lünow, "On the relativistic non-linear interaction of cold plasma with electro-magnetic waves," Plasma Phys.10(9), 879-897 (1968). 42. S. Guérin, P. Mora, J. C. Adam, A. Heron, and G. Laval, "Propagation of ultraintense laser pulses through overdense plasma layers," Phys. Plasmas 3(7), 2693-2701 (1996)

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Section: Brief Theory Of Langmuir-wave-caused Dips In Spectral Line Psupporting

confidence: 81%

Using X-ray spectroscopy of relativistic laser plasma interaction to reveal parametric decay instabilities: a modeling tool for astrophysics

et al. 2017

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“…The intensity of the laser pulse was set to 2 Â 10 20 W cm -2 . To account for the laser propagation effects due to the expansion of the front surface, 24 the target was positioned 30 lm from the incoming laser boundary. Computationally intensive test simulations with contamination layers on both the front and rear sides, and with binary collisions enabled, show that the front surface proton layer is largely ablated and does not propagate through the Al 11þ ions.…”

Section: Simulation Resultsmentioning

confidence: 99%

Intra-pulse transition between ion acceleration mechanisms in intense laser-foil interactions

et al. 2016

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Multiple ion acceleration mechanisms can occur when an ultrathin foil is irradiated with an intense laser pulse, with the dominant mechanism changing over the course of the interaction. Measurement of the spatial-intensity distribution of the beam of energetic protons is used to investigate the transition from radiation pressure acceleration to transparency-driven processes. It is shown numerically that radiation pressure drives an increased expansion of the target ions within the spatial extent of the laser focal spot, which induces a radial deflection of relatively low energy sheath-accelerated protons to form an annular distribution. Through variation of the target foil thickness, the opening angle of the ring is shown to be correlated to the point in time transparency occurs during the interaction and is maximized when it occurs at the peak of the laser intensity profile. Corresponding experimental measurements of the ring size variation with target thickness exhibit the same trends and provide insight into the intra-pulse laser-plasma evolution.

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“…This can be attributed to the different density distributions of preplasma which affect the laser energy absorption and coupling to hot electrons. 28 The effects may be enhanced by the density plateau formed for thicker SF which would lead to a longer interaction length. These results verify that the use of plasma shutter in VGDF target assembly allows us to actively enhance and manipulate proton beam for applications.…”

Section: Resultsmentioning

confidence: 99%

Plasma optical shutter in ultraintense laser-foil interaction

et al. 2017

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We report on a plasma optical shutter to reduce the intensity level of nanosecond-duration pedestal of the amplified spontaneous emission (ASE) using an ultrathin foil. The foil is ionized by the ASE prepulse and forms an expanding underdense preplasma, which enables the main laser pulse transmission, leading to an enhancement in temporal contrast. When such a plasma shutter is applied in front of an interested main target, the preplasma profiles are similar to that produced from single-layer reference target irradiated by highcontrast laser and can be finely tuned by varying the shutter thickness. Proton beam with significantly reduced divergence and higher flux density was measured experimentally using the double-foil design. The reduction in beam divergence is a characteristic signature of higher contrast laser production as a combined consequence of less target deformation and flatter sheath-acceleration field, as supported by the two-dimensional (2D) hydrodynamic and particle-in-cell simulations. The plasma shutter holds the promise to enhance the laser contrast and manipulate the preplasma conditions for applications in high-field-physics experiments.

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Laser pulse propagation and enhanced energy coupling to fast electrons in dense plasma gradients

Cited by 31 publications

References 30 publications

Using X-ray spectroscopy of relativistic laser plasma interaction to reveal parametric decay instabilities: a modeling tool for astrophysics

Using X-ray spectroscopy of relativistic laser plasma interaction to reveal parametric decay instabilities: a modeling tool for astrophysics

Intra-pulse transition between ion acceleration mechanisms in intense laser-foil interactions

Plasma optical shutter in ultraintense laser-foil interaction

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