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  • Critical parameters for turbulent transport in the SOL: mechanism for the L-H transition and its impact on the H-mode power threshold and density limit in ITER


An explanation for the L-H transition through the electromagnetic mechanism: suppression of drift wave turbulence by the skin effect, is offered. In dimensional space, the bifurcation is attributed to the involvement of 2 parameters in the L-H transition physics: rho(*) and Beta/nu(*)rho(*2). The maximum of the diffusion coefficient, corresponding to the L-H transition, is reached when the collisional skin-depth equals the characteristic radial displacement, Delta, of the drift turbulence.
The proposed mechanism for the L-H transition clarifies the R-dependence of the H-mode power threshold in ITER. The critical parameter for the L-H transition, together with dimensionless parameters characterizing pressure gradient and resistivity, create the set of similarity parameters describing ELM behaviour.

Additional information

Authors: CHANKIN A V, JET Joint Undertaking, Abingdon, Oxon (GB)
Bibliographic Reference: Report: JET-P(97)02 EN (1997) 42pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
Record Number: 199710488 / Last updated on: 1997-05-09
Original language: en
Available languages: en