Magnetized ICF implosions: non-axial magnetic field topologies

Walsh, C. A.; Strozzi, D. J.; Povilus, A.; O’Neill, S. T.; Leal, L.; Pollock, B.; Sio, H.; Hammel, B.; Djordjević, B. Z.; Chittenden, J. P.; Moody, J. D.

doi:10.1088/1741-4326/adb7f0

Title: Magnetized ICF implosions: non-axial magnetic field topologies

Journal Article · 28 February 2025 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/adb7f0 · OSTI ID:2540001

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Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Imperial College, London (United Kingdom of Great Britain and Northern Ireland)

This paper explores four different magnetic field topologies for application to spherical inertial confinement fusion implosions: axial, mirror, cusp and closed field lines. A mirror field is found to enhance the impact of magnetization over an axial field; this is because the mirror field more closely follows the hot-spot surface. A cusp field, while simple to generate, is not found to have any benefits over the tried-and-tested axial field. Closed field lines are found to be of the greatest benefit to hot-spot performance, with the simulated design undergoing a 2× increase in ion temperature before α-heating is considered. The plasma properties of the simulation with closed field lines are radically different from the unmagnetized counterpart, with electron temperatures in excess of 100 keV, suggesting that a fundamental redesign of the capsule implosion is possible if this method is pursued.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2540001

Report Number(s):: LLNL--JRNL-871095; 1108191

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 3 Vol. 65; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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