Bradford, P., Dearling, A., Ehret, M. et al. (17 more authors) (2021) Measuring magnetic fields in laser-driven coils with dual-axis proton deflectometry. Plasma Physics and Controlled Fusion. 084008. ISSN 1361-6587
Abstract
By driving hot electrons between two metal plates connected by a wire loop, high power lasers can generate multi-tesla, quasi-static magnetic fields in miniature coil targets. Many experiments involving laser-coil targets rely on proton deflectometry directed perpendicular to the coil axis to extract a measurement of the magnetic field. In this paper, we show that quantitative measurements using perpendicular probing are complicated by the presence of GV m-1 electric fields in the target that develop on sub-ns timescales. Probing parallel to the coil axis with fiducial grids is shown to reliably separate the electric and magnetic field measurements, giving current estimates of I ≈ 5 kA in 1 mm- and 2 mm-diameter wire loops. An analytic model of proton deflection in electric and magnetic fields is used to benchmark results from the particle-in-cell code and help deconvolve the magnetic and electric field deflections. Results are used to motivate a new experimental scheme that combines a single-plate target with axial proton probing and direct current measurements. This scheme has several important advantages over the traditional target and diagnostic set-up, enabling the robust measurement of coil magnetic fields and plasma properties, as well as making it easier to validate different theoretical models at a range of laser intensities.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2021 The Author(s). Published by IOP Publishing Ltd. |
Keywords: | coils,fields,laser,magnetic,plasma,proton deflectometry,proton radiography |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) The University of York > Faculty of Sciences (York) > Electronic Engineering (York) The University of York > Faculty of Sciences (York) > Chemistry (York) The University of York > Faculty of Arts and Humanities (York) > History (York) |
Funding Information: | Funder Grant number EPSRC EP/P026796/1 EPSRC EP/L000644/1 |
Depositing User: | Pure (York) |
Date Deposited: | 03 Aug 2021 10:30 |
Last Modified: | 11 Dec 2024 00:17 |
Published Version: | https://doi.org/10.1088/1361-6587/ac0bca |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1088/1361-6587/ac0bca |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:176771 |
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