15.8 Low-beta equilibrium vs. high-beta equilibrium

With the pressure increasing, the magnetic axis usually shifts to the low-field-side of the device, as is shown in Fig. 32.


pict pict

Fig. 32: Comparison of two equilibria obtained with P0 = 104 Pasca (left) and P0 = 105 Pasca (right), respectively, where P0 is the pressure at the magnetic axis. All the other parameters are the same for the two equilibria, α = 1.0, β = 1.0, Pb = 101 Pasca, g0 = 1.0Tm, Iϕ = 500kA, and the LCFS is given by miller’s formulas (431) and (432) with R0 = 1.7, a = 0.45, κ = 1.7, and δ = 0.6.