Abstract:
The paper considers the relation between constraint parameter $\beta_p$ and parameter $\beta$ which is used in the Grad–Shafranov equation written in the “canonical” form. It is shown that, when $0\le\beta_p\le 3.4$, it is possible to use $\beta_p$ instead of $\beta$. When $\beta_p$ is higher, this dependence gets violated. This effect was assumed to be associated with the fact that, when $\beta_p$ values are high, in the plasma there appear regions where the plasma poloidal flux, longitudinal current density, and pressure become negative.
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