Superconducting magnesium diboride films for levitation of laser targets

Bayu Aji, L. B.; Baker, A. A.; Bae, J. H.; Beckham, J. L.; Jacob, R. E.; Shin, S. J.; McCall, S. K.; Kucheyev, S. O.

doi:10.1016/j.tsf.2020.138260

Title: Superconducting magnesium diboride films for levitation of laser targets

Journal Article · Wed Sep 30 00:00:00 EDT 2020 · Thin Solid Films

DOI:https://doi.org/10.1016/j.tsf.2020.138260· OSTI ID:1647141

^[1]; Baker, A. A. ^[1]; Bae, J. H. ^[2];

^[1]; Jacob, R. E. ^[1]; Shin, S. J. ^[1]; McCall, S. K. ^[1]; Kucheyev, S. O. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
General Atomics, San Diego, CA (United States)

Inertial confinement fusion targets would benefit from being levitated inside hohlraums to avoid capsule support-related implosion perturbations. Levitation inside a magnetic trap requires coating the capsule with a thin film that is superconducting at 20 K. Such non-epitaxial film growth on non-planar substrates is challenging. Here, we study Mg vapor annealing and solid-phase reactive inter-diffusion methods to form superconducting magnesium diboride (MgB₂) films on different planar and spherical carbon substrates, evaluating glassy carbon, polycrystalline diamond made by chemical vapor deposition, and carbon deposited by magnetron sputtering of graphite targets. Thin films of B and Mg are produced by magnetron sputtering onto stationary planar or rolling spherical substrates and annealed at either 600 or 850 °C in Mg vapor. The films are characterized by a combination of high-energy ion scattering, electron microscopy, and magnetometry. Results show that the critical superconducting temperature of resultant films depends on film microstructure and oxygen impurity content. The formation of MgB₂ films is also strongly substrate dependent, even in this case of non-epitaxial growth. Important factors to consider are oxygen outgassing of the substrate during thermal processing, substrate surface roughness, and the matching of thermal expansion coefficients of different layers in the multilayer structure.

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC52-07NA27344; 17-ERD-040

OSTI ID:: 1647141

Alternate ID(s):: OSTI ID: 1776254

Report Number(s):: LLNL-JRNL-791922; 991112; TRN: US2202684

Journal Information:: Thin Solid Films, Vol. 710; ISSN 0040-6090

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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75 CONDENSED MATTER PHYSICS
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