Implications of Dimensionless Variable Scalings for Burning Plasma Experiments

Details Implications of Dimensionless Variable Scalings for Burning Plasma Experiments Implications of Dimensionless Variable Scalings for Burning Plasma Experiments

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apre16005p&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

Similarity experiments on various magnetic-confinement fusion devices have shown that the cross-magnetic-field diffusion of heat can be characterized by a small set of dimensionless variables. The scaling of heat diffusion with two of these variables, the ion gyroradius normalized to the plasma radius (ρ_*) and the ratio of the plasma pressure to the magnetic field pressure (β), helps to distinguish between various proposed instability mechanisms of turbulent diffusion, and therefore is critical for projections to future burning plasma experiments. The measured ρ* scaling of heat diffusion in high confinement plasmas agrees with the majority of theories that predict that the radial wavelength of turbulence scales with the ion gyroradius rather than with the plasma size. This is a favorable result since it reduces the minimum plasma size required for fusion ignition by nearly a factor of two. The measured β scaling of heat diffusion shows that electromagnetic effects are not an important element of turbulent diffusion; thus, the fusion gain in burning plasma experiments should optimize at high values of β.

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