Direct observation of turbulent magnetic fields in hot, dense laser produced plasmas.

Proceedings of the National Academy of Sciences of the United States of America
S MondalG Ravindra Kumar

Abstract

Turbulence in fluids is a ubiquitous, fascinating, and complex natural phenomenon that is not yet fully understood. Unraveling turbulence in high density, high temperature plasmas is an even bigger challenge because of the importance of electromagnetic forces and the typically violent environments. Fascinating and novel behavior of hot dense matter has so far been only indirectly inferred because of the enormous difficulties of making observations on such matter. Here, we present direct evidence of turbulence in giant magnetic fields created in an overdense, hot plasma by relativistic intensity (10(18) W/cm(2)) femtosecond laser pulses. We have obtained magneto-optic polarigrams at femtosecond time intervals, simultaneously with micrometer spatial resolution. The spatial profiles of the magnetic field show randomness and their k spectra exhibit a power law along with certain well defined peaks at scales shorter than skin depth. Detailed two-dimensional particle-in-cell simulations delineate the underlying interaction between forward currents of relativistic energy "hot" electrons created by the laser pulse and "cold" return currents of thermal electrons induced in the target. Our results are not only fundamentally interesting b...Continue Reading

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Citations

Jul 1, 2017·Nature Communications·Gourab ChatterjeeG Ravindra Kumar
Dec 18, 2013·Physical Review Letters·W FoxP M Nilson
Sep 11, 2019·Physical Review. E·Guy PelletierMartin Lemoine
May 2, 2015·Journal of Synchrotron Radiation·Bob NaglerHae Ja Lee
Oct 16, 2015·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Brett D KeenanMikhail V Medvedev
Jan 31, 2014·Physical Review Letters·C K LiM Koenig
Aug 16, 2013·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Brett D Keenan, Mikhail V Medvedev

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