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Abstract

A simplified model of a fully ionized, stable magnetically confined plasma, being subject to a classical transport, is used to estimate an upper limit of the Lawson parameter n-tau-E. The latter is expressed in terms of three variables, i.e. the plasma temperature, the beta value, and the number of ion Larmour radii N-i being contained within the thickness of the plasma body. There are two results of this analysis. First, values of n-tau-E near its upper limit are reached already at moderately large numbers N-i. Such numbers are desirable in confinement systems where large Larmour Larmour radius (LLR) effects become important to stability. Second, high beta values are necessary when n-tau-E has to exceed its critical value for ignition by a sufficiently large margin. Thus, when there is no effective reabsorption of cyclotron radiation, the low beta values would otherwise lead to conditions which are insufficient for ignition. Moreover, to reach the power levels of a full-scale reactor in Extrap-like systems, the number of ion Larmour radii within the plasma thickness would have to be in the range 10-?<N-i-?<30. An important task for further analysis is therefore to determine the highest values of N-i for which stable plasma equilibria can be realized.

Additional information

Authors: LEHNERT B ROYAL INSTITUTE OF TECHNOLOGY, STOCKHOLM (SWEDEN), ROYAL INSTITUTE OF TECHNOLOGY, STOCKHOLM (SWEDEN)
Bibliographic Reference: WRITE TO THE DEPARTMENT OF PLASMA PHYSICS AND FUSION RESEARCH, ROYAL INSTITUTE OF TECHNOLOGY, S-100 44 STOCKHOLM (SWEDEN), MENTIONING REPORT TRITA-PFU-85-08, 1985
Record Number: 1989124089100 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en