| Popis: |
Using a floating double probe, we have determined values for the cross-field diffusion coefficient D⊥(a) (0.2–1.0 m2/s), the gross particle confinement time τp (10–100 ms) and the radial particle flux Γ(a) (1019–1020 m−2 s−1), near the limiter radius for Ip = 100 kA, ne = (1.0–4.5) × 1019/m3 and BT = 1.4–2.5 T. The parametric dependence of the edge plasma parameters on BT and line averaged density, n¯e, has been found to be non-linear. The turbulence characteristics have been studied using spectroscopy, microwave reflectometry, magnetic coils and an array of Langmuir probes. The experimental results indicate that turbulent diffusion plays a key role in the particle transport. |
