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Title: Time-resolved turbulent dynamo in a laser plasma

Abstract

Understanding magnetic-field generation and amplification in turbulent plasma is essential to account for observations of magnetic fields in the universe. A theoretical framework attributing the origin and sustainment of these fields to the so-called fluctuation dynamo was recently validated by experiments on laser facilities in low-magnetic-Prandtl-number plasmas (Pm<1). However, the same framework proposes that the fluctuation dynamo should operate differently when Pm≳1, the regime relevant to many astrophysical environments such as the intracluster medium of galaxy clusters. This paper reports an experiment that creates a laboratory Pm≳1 plasma dynamo. We provide a time-resolved characterization of the plasma’s evolution, measuring temperatures, densities, flow velocities, and magnetic fields, which allows us to explore various stages of the fluctuation dynamo’s operation on seed magnetic fields generated by the action of the Biermann-battery mechanism during the initial drive-laser target interaction. The magnetic energy in structures with characteristic scales close to the driving scale of the stochastic motions is found to increase by almost three orders of magnitude and saturate dynamically. It is shown that the initial growth of these fields occurs at a much greater rate than the turnover rate of the driving-scale stochastic motions. Our results point to the possibility that plasma turbulencemore » produced by strong shear can generate fields more efficiently at the driving scale than anticipated by idealized magnetohydrodynamics (MHD) simulations of the nonhelical fluctuation dynamo; this finding could help explain the large-scale fields inferred from observations of astrophysical systems.« less

Authors:
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Publication Date:
DOE Contract Number:  
NA0002724; NA0003605; NA0003934; NA0003868; NA0003856; SC0016566; AC02-06CH11357
Research Org.:
Univ. of Chicago, IL (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; Univ. of Rochester, NY (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 79 ASTRONOMY AND ASTROPHYSICS
OSTI Identifier:
1887800
DOI:
https://doi.org/10.7910/DVN/USBOGQ

Citation Formats

Bott, Archie F. A., Tzeferacos, Petros, Chen, Laura, Palmer, Charlotte A. J., Rigby, Alexandra, Bell, Anthony R., Bingham, Robert, Birkel, Andrew, Graziani, Carlo, Froula, Dustin H., Katz, Joseph, Koenig, Michel, Kunz, Matthew W., Li, Chikang, Meinecke, Jena, Miniati, Francesco, Petrasso, Richard, Park, Hye-Sook, Remington, Bruce A., Reville, Brian, Ross, J. Steven, Ryu, Dongsu, Ryutov, Dmitri, Séguin, Fredrick H., White, Thomas G., Schekochihin, Alexander A., Lamb, Donald Q., and Gregori, Gianluca. Time-resolved turbulent dynamo in a laser plasma. United States: N. p., 2022. Web. doi:10.7910/DVN/USBOGQ.
Bott, Archie F. A., Tzeferacos, Petros, Chen, Laura, Palmer, Charlotte A. J., Rigby, Alexandra, Bell, Anthony R., Bingham, Robert, Birkel, Andrew, Graziani, Carlo, Froula, Dustin H., Katz, Joseph, Koenig, Michel, Kunz, Matthew W., Li, Chikang, Meinecke, Jena, Miniati, Francesco, Petrasso, Richard, Park, Hye-Sook, Remington, Bruce A., Reville, Brian, Ross, J. Steven, Ryu, Dongsu, Ryutov, Dmitri, Séguin, Fredrick H., White, Thomas G., Schekochihin, Alexander A., Lamb, Donald Q., & Gregori, Gianluca. Time-resolved turbulent dynamo in a laser plasma. United States. doi:https://doi.org/10.7910/DVN/USBOGQ
Bott, Archie F. A., Tzeferacos, Petros, Chen, Laura, Palmer, Charlotte A. J., Rigby, Alexandra, Bell, Anthony R., Bingham, Robert, Birkel, Andrew, Graziani, Carlo, Froula, Dustin H., Katz, Joseph, Koenig, Michel, Kunz, Matthew W., Li, Chikang, Meinecke, Jena, Miniati, Francesco, Petrasso, Richard, Park, Hye-Sook, Remington, Bruce A., Reville, Brian, Ross, J. Steven, Ryu, Dongsu, Ryutov, Dmitri, Séguin, Fredrick H., White, Thomas G., Schekochihin, Alexander A., Lamb, Donald Q., and Gregori, Gianluca. 2022. "Time-resolved turbulent dynamo in a laser plasma". United States. doi:https://doi.org/10.7910/DVN/USBOGQ. https://www.osti.gov/servlets/purl/1887800. Pub date:Wed Mar 16 00:00:00 EDT 2022
@article{osti_1887800,
title = {Time-resolved turbulent dynamo in a laser plasma},
author = {Bott, Archie F. A. and Tzeferacos, Petros and Chen, Laura and Palmer, Charlotte A. J. and Rigby, Alexandra and Bell, Anthony R. and Bingham, Robert and Birkel, Andrew and Graziani, Carlo and Froula, Dustin H. and Katz, Joseph and Koenig, Michel and Kunz, Matthew W. and Li, Chikang and Meinecke, Jena and Miniati, Francesco and Petrasso, Richard and Park, Hye-Sook and Remington, Bruce A. and Reville, Brian and Ross, J. Steven and Ryu, Dongsu and Ryutov, Dmitri and Séguin, Fredrick H. and White, Thomas G. and Schekochihin, Alexander A. and Lamb, Donald Q. and Gregori, Gianluca},
abstractNote = {Understanding magnetic-field generation and amplification in turbulent plasma is essential to account for observations of magnetic fields in the universe. A theoretical framework attributing the origin and sustainment of these fields to the so-called fluctuation dynamo was recently validated by experiments on laser facilities in low-magnetic-Prandtl-number plasmas (Pm<1). However, the same framework proposes that the fluctuation dynamo should operate differently when Pm≳1, the regime relevant to many astrophysical environments such as the intracluster medium of galaxy clusters. This paper reports an experiment that creates a laboratory Pm≳1 plasma dynamo. We provide a time-resolved characterization of the plasma’s evolution, measuring temperatures, densities, flow velocities, and magnetic fields, which allows us to explore various stages of the fluctuation dynamo’s operation on seed magnetic fields generated by the action of the Biermann-battery mechanism during the initial drive-laser target interaction. The magnetic energy in structures with characteristic scales close to the driving scale of the stochastic motions is found to increase by almost three orders of magnitude and saturate dynamically. It is shown that the initial growth of these fields occurs at a much greater rate than the turnover rate of the driving-scale stochastic motions. Our results point to the possibility that plasma turbulence produced by strong shear can generate fields more efficiently at the driving scale than anticipated by idealized magnetohydrodynamics (MHD) simulations of the nonhelical fluctuation dynamo; this finding could help explain the large-scale fields inferred from observations of astrophysical systems.},
doi = {10.7910/DVN/USBOGQ},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2022},
month = {3}
}

Works referencing / citing this record:

Time-resolved turbulent dynamo in a laser plasma
journal, March 2021