Measurements of extended magnetic fields in laser-solid interaction

Magnetic fields generated from a laser-foil interaction are measured with high fidelity using a proton radiography scheme with x-ray fiducials. In contrast to prior findings under similar experimental conditions, this technique reveals the self-generated, Biermann-battery fields extend beyond the ed...

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Published in:Physical review research 2024-09, Vol.6 (3), p.033312, Article 033312
Main Authors: Griff-McMahon, J., Malko, S., Valenzuela-Villaseca, V., Walsh, C. A., Fiksel, G., Rosenberg, M. J., Schaeffer, D. B., Fox, W.
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Language:English
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ASTRONOMY AND ASTROPHYSICS
High intensity laser-plasma interactions
Laser-induced magnetic fields in plasmas
Magnetic field generation & plasma dynamo
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container_issue 3
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container_title Physical review research
container_volume 6
creator Griff-McMahon, J.
Malko, S.
Valenzuela-Villaseca, V.
Walsh, C. A.
Fiksel, G.
Rosenberg, M. J.
Schaeffer, D. B.
Fox, W.
description Magnetic fields generated from a laser-foil interaction are measured with high fidelity using a proton radiography scheme with x-ray fiducials. In contrast to prior findings under similar experimental conditions, this technique reveals the self-generated, Biermann-battery fields extend beyond the edge of the expanding plasma plume to a radius of over 3.5 mm by t = + 1.4  ns. An analysis of two monoenergetic proton populations confirms that proton deflection is dominated by magnetic fields far from the interaction ( > 2  mm) and electric fields are insignificant. The results are not captured in state-of-the-art magnetohydrodynamics simulations and suggest the need to consider additional physics mechanisms for the magnetic field generation and transport in laser-solid interactions.
doi_str_mv 10.1103/PhysRevResearch.6.033312
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subjects ASTRONOMY AND ASTROPHYSICS
High intensity laser-plasma interactions
Laser-induced magnetic fields in plasmas
Magnetic field generation & plasma dynamo
title Measurements of extended magnetic fields in laser-solid interaction
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