Ignition Analysis on the High Field D-T Helical Reactor

Ignition characteristics in the D-T high field helical reactor of R=20 m, ā =2 m are analyzed by the “operation path method” on the P̄_htτ_E²-T plane and “POPCON”. Based on the LHD scaling law, the strong magnetic field B₀=12~15 T makes a reactor operable with a low confinement enhancement, leading to the low helium ash accumulation. POPCON analyses with the synchrotron radiation losses, the density limit and confinement time saturation effect show that merginal confinement factors to have the fusion power of 3 GW are 0.9 to 1.3 for B_o=15 T, and 1.1 to 1.6 for 12 T, respectively.