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Peak plasma densities in excess of 10^15 cm^-3 have been obtained in the Alcator tokamak with 60<~Bₓ<85 kG. The highest average density so far achieved is n₄=610^14 cm^-3; the corresponding n₀₄=210^13 cm^-3 s. These ultrahigh-density discharges exhibit (i) nearly complete energy equilibration between electrons and ions, (ii) severe attenuation of energetic-neutral-particle fluxes, (iii) a minor role of impurities, and (iv) energy-confinement properties consistent with neoclassical estimates.
Gaudreau et al. (1977) studied this question.
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