Linear self consistency of microtearing modes
The self consistency of a microtearing turbulence is studied in non linear regimes where the ergodicity of the flux lines determines the electron response. The current which sustains the magnetic perturbation via the Ampère law results from the combined action of the radial electric field (in the frame where the island chains are static) and of the thermal electron diamagnetism. Numerical calculations show that at usual values of beta(pol) in Tokamaks the turbulence can create a diffusion coefficient of order v(th)r(i)2 where r(i) is the ion Larmor radius and v(th) the electron ion collision frequency. On the other hand, collisionless regimes involving special profiles of each mode near the resonant surface seem possible.
Bibliographic Reference: Article: Plasma Physics and Controlled Fusion, Vol. 30 (1988), No. 4, pp. 343-363
Record Number: 198910847 / Last updated on: 1994-12-01
Original language: en
Available languages: en