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Related Experiment Video

Updated: Nov 12, 2025

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses

Published on: July 2, 2012

Time-resolved turbulent dynamo in a laser plasma.

Archie F A Bott^1,2, Petros Tzeferacos^3,4,5,6, Laura Chen³

¹Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom; abott@princeton.edu.

Proceedings of the National Academy of Sciences of the United States of America

|March 17, 2021

Summary

This study demonstrates a laboratory plasma dynamo in a high magnetic Prandtl number regime, crucial for understanding astrophysical magnetic fields. The experiment shows significant magnetic field amplification, offering insights into cosmic magnetic field generation.

Keywords:

fluctuation dynamo laboratory astrophysics magnetic fields

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Last Updated: Nov 12, 2025

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses

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Published on: February 4, 2017

Area of Science:

Plasma physics
Astrophysical magnetohydrodynamics
Dynamo theory

Background:

Understanding cosmic magnetic fields requires knowledge of their generation and amplification in turbulent plasma.
The fluctuation dynamo theory explains magnetic field sustainment in low magnetic Prandtl number plasmas.
Astrophysical environments like galaxy clusters operate in a high magnetic Prandtl number regime where dynamo behavior may differ.

Purpose of the Study:

To experimentally create and characterize a laboratory dynamo in a high magnetic Prandtl number plasma.
To investigate the operation of the fluctuation dynamo in a regime relevant to astrophysical environments.
To explore the growth and saturation of magnetic fields generated by the Biermann-battery mechanism.

Main Methods:

Experimental creation of a laboratory high magnetic Prandtl number plasma dynamo.
Time-resolved characterization of plasma parameters: temperature, density, flow velocity, and magnetic fields.
Analysis of magnetic energy growth and saturation in relation to turbulent motion scales.

Main Results:

Observed magnetic energy increase by nearly three orders of magnitude, saturating dynamically.
Demonstrated initial magnetic field growth rates exceeding the turnover rate of driving-scale stochastic motions.
Provided evidence for efficient magnetic field generation at the driving scale by plasma turbulence from strong shear.

Conclusions:

The experiment successfully created a laboratory dynamo in the high magnetic Prandtl number regime.
Results suggest plasma turbulence can generate magnetic fields more efficiently than predicted by idealized MHD simulations.
Findings offer a potential explanation for large-scale magnetic fields observed in astrophysical systems.