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ELFIE - Nonlocal heat transport in strongly magnetized plasmas (A. Marocchino)

The mechanisms for heat transport in high temperature laser produced plasmas are fundamental processes in plasma physics. In recent years the importance of nonlocal electron heat transport has been brought to a vaster audience and a substantial amount of work has been conducted theoretically and experimentally in the limit of unmagnetized conditions. However, in reality, hydrodynamic instabilities can self-induce magnetic field that have a feed back by significantly modifying heat flux. Modeling nonlocal transport, both in a an unmagnetized as well as in magnetized condition, is a non-trivial problem. Detailed experimental investigations are required to test the different theoretical and numerical approaches that can be found in literature. In this experiment we propose to diagnose the effect of nonlocal heat-flux in a magnetized condition by focusing a short laser pulse into a clustered gas surrounded by a constant intense magnetic field (the magnetic field, surrounding the plasma, is induced by a pulsed coil capable of delivering a magnetic field up to ~20 T for ~1 ms). The combination of short pulse lasers with clustered gases has shown to be a unique method to produce high-temperature plasmas of interest for heat transport problems: pronounced thermal gradients where electron mean free paths may easily exceed the plasma gradients scale-length. These conditions, with an externally imposed magnetic field that can be varied at will, are an ideal platform to investigate nonlocal electron transport in a controlled environment. Our investigations have a strong focus on the characterization of the effect of nonlocal electron transport in the presence of a magnetic field, which is a critical aspect for plasmas that self-induce magnetic fields, as well as on the full characterization of the other relevant plasma parameters, as achieved in our previous experiments. Through comparison with numerical simulations, this will in principle allow a deeper understanding of these processes and of their relative interplay in determining complex plasma dynamics.

ELFIE - S4-6 / 2018