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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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A high repetition rate scintillator-based transverse beam profile diagnostic for laser-plasma accelerated proton beams has been designed and commissioned. The proton beam profiler uses differential filtering to provide coarse energy resolution and a flexible design to allow optimisation for expected beam energy range and trade-off between spatial and energy resolution depending on the application. A plastic scintillator detector, imaged with a standard 12-bit scientific camera, allows data to be taken at a high repetition rate. An algorithm encompassing the scintillator non-linearity is described to estimate the proton spectrum at different spatial locations.