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Megagauss physics.

C M Fowler

    Science (New York, N.Y.)
    |April 20, 1973
    PubMed
    Summary
    This summary is machine-generated.

    Megagauss fields, generated by explosive flux compression, are powerful tools for high-pressure research. While reliable up to 10 MG, new experiments explore metallic hydrogen transitions at extreme pressures.

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    Area of Science:

    • High-energy physics
    • Solid-state physics
    • Plasma physics

    Background:

    • Megagauss fields (MG) are achievable via explosive flux compression (>10 MG) and capacitor banks (up to 3 MG).
    • Reliable measurements exist up to 10 MG, with challenges anticipated at higher field strengths.
    • Existing applications include high-pressure generation, particle physics, and solid-state studies.

    Purpose of the Study:

    • To investigate the potential of megagauss fields in various scientific applications.
    • To explore the transition to metallic hydrogen under extreme pressures.
    • To refine experimental techniques for generating and measuring ultra-high magnetic fields.

    Main Methods:

    • Explosive flux compression techniques to generate magnetic fields exceeding 10 MG.

    Related Experiment Videos

  • Capacitor banks for producing fields up to 3 MG.
  • High-pressure experiments involving the compression of hydrogen and deuterium.

    • Main Results:

    • Experimental data on hydrogen compression show pressure-density points consistent with theoretical predictions for metallic hydrogen.
    • Grigor'ev et al. reported a transition at 2.8 x 10^6 atmospheres with specific density changes.
    • Hawke et al. obtained a pressure-density point at 1.5 x 10^6 atmospheres, also not inconsistent with metallic hydrogen models.
    • Tentative data for deuterium were obtained, with one point aligning with extrapolated data and another at 65±3 x 10^3 atmospheres and 0.71±0.10 g/cm³.

    Conclusions:

    • Current pressure-density data are insufficient to conclusively prove the existence of a metallic hydrogen transition.
    • Further experimental work, including electrical conductivity measurements of compressed hydrogen, is needed for definitive evidence.
    • Ongoing research aims to acquire more data points for both hydrogen and deuterium to better understand their equations of state under extreme conditions.