Considering a current profile driven by a neutral beam having a beam energy up to 2.5 MeV, attainable normalized beta β
N with and without a stabilization wall are investigated for next step reactors with R
0 = 7.25 m and R/a = 3.4. Because of restrictions in the attainable current profile, β
N is restricted up to 2.5 without a wall, while β
N = 3.4 is possible with a wall, because broader current profiles are allowable in the wall stabilized equiliblia. This result suggests that wall stabilization is necessary even in the conservative design with β
N < 3.
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