Values of βT≥30% have been achieved and sustained for several confinement times on the START spherical tokamak using additional heating provided by neutral beam injection. These values are more than twice the highest value previously obtained in a tokamak, and correspond to normalized β values of βN≥4. In these shots values of Iₚ>Irod (where Irod is the current flowing in the central toroidal field rod) have been obtained, which are considered to be necessary for spherical tokamak power plant. The results are compared with ideal-MHD stability theory.
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Gryaznevich et al. (1998) studied this question.
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