Experimental results on the formation of a 400-keV proton layer

is obtained, where E denotes the complete elliptic integral of the second kind and qc = (p/R0)(B0/Bpc). This expression shows that a vertically elongated elliptic tokamak with K » 1 is advantageous from the point of view of neoclassical diffusion. When the safety factor of an elliptic tokamak qNC is equal to qc, DX-D°/K is found for K » 1 (which corresponds to Ref.[5]). The values of G are shown 1.0