In a reactor relevant tokamak the appropriate definition of {beta}, the ratio of the particle and magnetic field pressures, is {beta}* {equivalent to} (2 < p{sup 2} >{sup {1/2}} /B{sup 2}), which exceeds the conventional definition by a factor dependent on the pressure peaking factor, PPF. A simple scaling is obtained which relates the two definitions, {beta}*/{beta}{approx equal}0.9 {plus} 0.15 PPF. Stability properties are determined in terms of {beta}* in a circular and dee-shaped tokamak. 4 refs., 6 figs.
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In a reactor relevant tokamak the appropriate definition of {beta}, the ratio of the particle and magnetic field pressures, is {beta}* {equivalent to} (2 < p{sup 2} >{sup {1/2}} /B{sup 2}), which exceeds the conventional definition by a factor dependent on the pressure peaking factor, PPF. A simple scaling is obtained which relates the two definitions, {beta}*/{beta}{approx equal}0.9 {plus} 0.15 PPF. Stability properties are determined in terms of {beta}* in a circular and dee-shaped tokamak. 4 refs., 6 figs.
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