Orateur
Description
We will present the characterization of magnetized turbulence generated in a laser-driven plasma. The work was performed at the LULI2000 laser facility (France). Starting from an homogenous magnetized plasma, produced by having a high-strength pulsed magnetic field [1] embedded in a gas jet, we randomly perturbed the gas using a speckled laser beam [2]. Using proton radiography [3], we will show quantitatively that the produced turbulence is intermittent and that its power distribution is akin that recorded in space [4,5,6]. We will also discuss of the applications for laboratory tests of astrophysical mechanisms involving turbulence, whether particle acceleration at high-velocity shock fronts [7].
[1] B. Albertazzi, et al., “Production of large volume, strongly magnetized laser-produced plasmas by use of pulsed external magnetic fields,” Review of Scientific Instruments, 84, 043505 (2013).
[2] W. Yao, et al., “Triggering and probing electromagnetic stochasticity in a low-density magnetized plasma irradiated by a multi-speckled laser beam,” CLF Annual Report 2021-22,
2022. https://www.clf.stfc.ac.uk/Gallery/13%20-%20Yao_CLF%20AR%2021-22.pdf
[3] D.B. Schaeffer, et al., “Proton imaging of high-energy-density laboratory plasmas,” Reviews of Modern Physics, v. 95(4), p. 045007 (2023).
[4] L. Sorriso-Valvo et al., “Observation of Inertial Energy Cascade in Interplanetary Space Plasma”, Phys. Rev. Lett. 99, 115001 (2007).
[5] V. Carbone et al., “Scaling Laws of Turbulence and Heating of Fast Solar Wind: The Role of Density Fluctuations”, Phys. Rev. Lett. 103, 061102 (2009).
[6] O. Alexandrova et al., “Universality of Solar-Wind Turbulent Spectrum from MHD to Electron Scales”, Phys. Rev. Lett. 103, 165003 (2009).
[7] A. R. Bell, “Cosmic ray acceleration”, Astroparticle Physics 43, 56 (2013).