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Hydrodynamic motion of guiding elements within a magnetic switchyard in fast ignition conditions

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JournalPhysics of Plasmas
DateSubmitted - 24 Jan 2020
DateAccepted/In press - 8 May 2020
DatePublished (current) - 1 Jun 2020
Volume27
Number of pages5
Original languageEnglish

Abstract

Magnetic collimation via resistivity gradients is an innovative approach to electron beam control for the cone-guided fast ignition variant of
inertial confinement fusion. This technique uses a resistivity gradient induced magnetic field to collimate the electron beam produced by the
high-intensity laser–plasma interaction within a cone-guided fast ignition cone-tip. A variant of the resistive guiding approach, known as the
“magnetic switchyard,” has been proposed which uses shaped guiding elements to direct the electrons toward the compressed fuel. Here, the
1D radiation-hydrodynamics code HYADES is used to investigate and quantify the gross hydrodynamic motion of these magnetic switchyard
guiding elements in conditions relevant to their use in fast ignition. Movement of the layers was assessed for a range of two-layer material
combinations. Based upon the results of the simulations, a scaling law is found that enables the relative extent of hydrodynamic motion
to be predicted based upon the material properties of the switchyard, thereby enabling optimization of material-combination choice on the
basis of reducing hydrodynamic motion. A multi-layered configuration, more representative of an actual switchyard, was also simulated in
which an outer Au layer is employed to tamp the motion of the outermost guiding element of the switchyard.

Bibliographical note

© 2020 Author(s).

*J.L.H. East was an undergraduate student in the Department of Physics at the University of York. This work incorporated a summer project that she performed between her 3rd and 4th years of undergraduate study whilst on a placement at the STFC Rutherford Appleton Laboratory supervised by JP and APLR. J.L.H. East was responsible for the initial drafts of this manuscript; E.J. Hume completed the study and finalised the manuscript for submission to Physics of Plasmas.

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