Troyon β limit: β_max[%] = β_N · I_p/(a·B) with β_N ≤ 2.8 for ideal MHD

Troyon (1984) ideal-MHD stability limit on the tokamak β = ⟨p⟩/(B²/2μ₀). For circular cross-section the scaling is β_max[%] = β_N · I_p[MA]/(a[m]·B[T]) with dimensionless Troyon constant β_N ≤ 2.8 (no-wall ideal-MHD n = 1 kink stability…