open access

https://hdl.handle.net/2115/48805

Preliminary Study of Uncertainty-Driven Plasma Diffusion

英語

neoclassical theory

2010

Japan Society of Plasma Science and Nuclear Fusion Research

Plasma and Fusion Research

5(S1050)

S1050-1-S1050-4

Quantum mechanical plasma diffusion is studied using a semi-classical model with two different characteristic lengths; one is the average interparticle separation, and the other is the magnetic length. The diffusion coefficients D derived in this study show a dependence on several plasma parameters, such as temperature T, mass m, density n, and magnetic field B, similar to that observed experimentally. The numerical values of the diffusion coefficient D in this study are as large as that for neoclassical diffusion. We have pointed out in this study that (i) for distant encounters in typical fusion plasmas of T = 10 keV and n = 1020 m−3, the average potential energy U ∼ 30meV is as small as the uncertainty in energy ΔE ∼ 40meV, and (ii) for a magnetic field B = 3 T, the spatial size of the wavefunction in the plane perpendicular to the magnetic field is as large as B ∼ 1.4 × 10−8 m, which is much larger than the typical electron wavelength λe ∼ 10−11 m.

学術雑誌論文

Version of Record

1880-6821

AA12346675