Experimental results on tokamak beta limits from ISX-B
Open Access
- 1 July 1985
- journal article
- letter
- Published by IOP Publishing in Nuclear Fusion
- Vol. 25 (7) , 825-827
- https://doi.org/10.1088/0029-5515/25/7/006
Abstract
It is observed that the expression β = Aβqψ / κ = 18–22% defines one of the operational boundaries for ISX-B and corresponds to empirical beta limit scalings obtained in other tokamaks. Although this expression closely agrees with simple expressions for ideal-MHD instability thresholds, it is not obvious that it constitutes a real tokamak beta limit. Confinement degradation is observed when β is well below this operating boundary, and there is neither experimental evidence nor a satisfactory theoretical model connecting this phenomenon with ideal-MHD activity.Keywords
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