Measurement of magnetic cavitation driven by heat flow in a plasma

Christopher Arran; Adam Dearling; Philip Bradford; George S. Hicks; Saleh Al-Atabi; Luca Antonelli; Oliver C. Ettlinger; Matthew Khan; Martin P. Read; Kevin Glize; Margaret Notley; Christopher A. Walsh; Robert J. Kingham; Zulfikar Najmudin; Christopher P. Ridgers; Nigel C. Woolsey

doi:10.1103/PhysRevLett.131.015101

Measurement of magnetic cavitation driven by heat flow in a plasma

Christopher Arran, Adam Dearling, Philip Bradford, George S. Hicks, Saleh Al-Atabi, Luca Antonelli, Oliver C. Ettlinger, Matthew Khan, Martin P. Read, Kevin Glize, Margaret Notley, Christopher A. Walsh, Robert J. Kingham, Zulfikar Najmudin, Christopher P. Ridgers, Nigel C. Woolsey

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

We describe the direct measurement of the expulsion of a magnetic field from a plasma driven by heat flow. Using a laser to heat a column of gas within an applied magnetic field, we isolate Nernst advection and show how it changes the field over a nanosecond timescale. Reconstruction of the magnetic field map from proton radiographs demonstrates that the field is advected by heat flow in advance of the plasma expansion with a velocity v_N=(6±2)×10^5 m/s. Kinetic and extended magnetohydrodynamic simulations agree well in this regime due to the buildup of a magnetic transport barrier.

Original language	English
Article number	015101
Number of pages	7
Journal	Physical Review Letters
Volume	131
DOIs	https://doi.org/10.1103/PhysRevLett.131.015101
Publication status	Published - 6 Jul 2023

Bibliographical note

5 pages, 4 figures

Keywords

physics.plasm-ph

Access to Document

10.1103/PhysRevLett.131.015101Licence: CC BY

Measurement of Magnetic Cavitation Driven by Heat Flow in a PlasmaFinal published version, 1.84 MBLicence: CC BY

Cite this

Arran, C., Dearling, A., Bradford, P., Hicks, G. S., Al-Atabi, S., Antonelli, L., Ettlinger, O. C., Khan, M., Read, M. P., Glize, K., Notley, M., Walsh, C. A., Kingham, R. J., Najmudin, Z., Ridgers, C. P., & Woolsey, N. C. (2023). Measurement of magnetic cavitation driven by heat flow in a plasma. Physical Review Letters, 131, [015101]. https://doi.org/10.1103/PhysRevLett.131.015101

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abstract = "We describe the direct measurement of the expulsion of a magnetic field from a plasma driven by heat flow. Using a laser to heat a column of gas within an applied magnetic field, we isolate Nernst advection and show how it changes the field over a nanosecond timescale. Reconstruction of the magnetic field map from proton radiographs demonstrates that the field is advected by heat flow in advance of the plasma expansion with a velocity v_N=(6±2)×10^5 m/s. Kinetic and extended magnetohydrodynamic simulations agree well in this regime due to the buildup of a magnetic transport barrier.",

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AU - Arran, Christopher

AU - Dearling, Adam

AU - Bradford, Philip

AU - Hicks, George S.

AU - Al-Atabi, Saleh

AU - Antonelli, Luca

AU - Ettlinger, Oliver C.

AU - Khan, Matthew

AU - Read, Martin P.

AU - Glize, Kevin

AU - Notley, Margaret

AU - Walsh, Christopher A.

AU - Kingham, Robert J.

AU - Najmudin, Zulfikar

AU - Ridgers, Christopher P.

AU - Woolsey, Nigel C.

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PY - 2023/7/6

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N2 - We describe the direct measurement of the expulsion of a magnetic field from a plasma driven by heat flow. Using a laser to heat a column of gas within an applied magnetic field, we isolate Nernst advection and show how it changes the field over a nanosecond timescale. Reconstruction of the magnetic field map from proton radiographs demonstrates that the field is advected by heat flow in advance of the plasma expansion with a velocity v_N=(6±2)×10^5 m/s. Kinetic and extended magnetohydrodynamic simulations agree well in this regime due to the buildup of a magnetic transport barrier.

AB - We describe the direct measurement of the expulsion of a magnetic field from a plasma driven by heat flow. Using a laser to heat a column of gas within an applied magnetic field, we isolate Nernst advection and show how it changes the field over a nanosecond timescale. Reconstruction of the magnetic field map from proton radiographs demonstrates that the field is advected by heat flow in advance of the plasma expansion with a velocity v_N=(6±2)×10^5 m/s. Kinetic and extended magnetohydrodynamic simulations agree well in this regime due to the buildup of a magnetic transport barrier.

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DO - 10.1103/PhysRevLett.131.015101

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