The Effect of Plasma Beta on High-n Ballooning Stability at Low Magnetic Shear
J W Connor, C J Ham, R J Hastie
TL;DR
This paper investigates how plasma beta influences high-n ballooning stability at low magnetic shear, explaining improved pedestal stability in tokamaks like MAST and JET through the effect of the Shafranov shift.
Contribution
It provides a theoretical analysis linking plasma beta and the Shafranov shift to ballooning stability, enhancing understanding of pedestal behavior in tokamaks.
Findings
Higher plasma beta improves ballooning stability at low shear.
The Shafranov shift significantly affects ideal MHD stability.
Results align with observed pedestal improvements in MAST and JET.
Abstract
An explanation of the observed improvement in H-mode pedestal characteristics with increasing core plasma pressure or poloidal beta, as observed in MAST and JET, is sought in terms of the impact of the Shafranov shift, d', on ideal ballooning MHD stability.
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