Numerical study of implosion instability mitigation in magnetically driven solid liner dynamic screw pinches

Shipley, G. A.; Ruiz, D. E.; Jennings, C. A.; Yager-Elorriaga, D. A.; Schmit, P. F.

doi:10.1063/5.0189042

Numerical study of implosion instability mitigation in magnetically driven solid liner dynamic screw pinches

Journal Article · Mon Feb 19 23:00:00 EST 2024 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0189042· OSTI ID:2567717

; ; Jennings, C. A.; ;

Magnetized liner inertial fusion experiments on the Z accelerator suffer from magneto-Rayleigh–Taylor instabilities (MRTI) that compromise integrity of the imploding cylindrical liner, limiting achievable fusion fuel conditions and ultimately reducing magneto-inertial fusion target performance. Dynamic screw pinches (DSP) provide a method to reduce MRTI in-flight via application of magnetic field line tension to the imploding liner outer surface. In contrast with z-pinches that drive implosions with an azimuthal magnetic field, dynamic screw pinches enforce an additional axial drive magnetic field component, making the overall drive magnetic field helical. As the liner implodes, cumulative MRTI development is reduced by dynamically shifting the orientation of the fastest growing instability modes. Three-dimensional magnetohydrodynamic simulations show that the DSP mechanism effectively stabilizes initially solid cylindrical liner implosions driven by Z-scale current pulses, indicating that MRTI mitigation increases with the ratio of axial to azimuthal drive magnetic field components (i.e., the drive field ratio). We also performed a spectral analysis of the simulated imploding density distributions, extracting wavelength and pitch angle of the simulated MRTI structures to study their dynamics during the implosion. Simulations of liners initially perturbed with drive-field-aligned sinusoidal structures indicate that MRTI mitigation in DSP implosions decreases with perturbation wavelength, once again suggestive of magnetic field line tension effects.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: NA0003525; NA0003864

OSTI ID:: 2567717

Alternate ID(s):: OSTI ID: 2333092

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 2 Vol. 31; ISSN 1070-664X

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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