PI: Prof. Gianluca Gregori, Department of Physics, University of Oxford, UK
Status: Performed in October 2017.
Inefficient magnetic-field amplification in supersonic laser-plasma turbulence
A. F. A. Bott*, L. Chen, G. Boutoux, T. Caillaud, A. Duval, M. Koenig, B. Khiar, I. Lantuéjoul, L. Le-Deroff, B. Reville, R. Rosch, D. Ryu, C. Spindloe, B. Vauzour, B. Villette, A. A. Schekochihin, D. Q. Lamb, P. Tzeferacos, G. Gregori, and A. Casner
*Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom and Department of Astrophysical Sciences, University of Princeton, 4 Ivy Lane, Princeton, New Jersey 08544, USA
Phys. Rev. Lett. 127, 175002 – Published 21 October 2021
Abstract: We report a laser-plasma experiment that was carried out at the LMJ-PETAL facility and realized the first magnetized, turbulent, supersonic (Maturb ≈ 2.5) plasma with a large magnetic Reynolds number (Rm ≈ 45) in the laboratory. Initial seed magnetic fields were amplified, but only moderately so, and did not become dynamically significant. A notable absence of magnetic energy at scales smaller than the outer scale of the turbulent cascade was also observed. Our results support the notion that moderately supersonic, low-magnetic-Prandtl-number plasma turbulence is inefficient at amplifying magnetic fields compared to its subsonic, incompressible counterpart.