Scaling laws of the multicomponent cool plasma mantle

Theoretical and experimental investigations of the two component plasma mantle have been performed. It is found theoretically that, in the case of classical transport, the scaling of the plasma density Nsub(i) with the main neutral density at the wall Nsub(n0) follows the law Nsub(n0) proportional to (Nsub(i))3. The scaling of the impurity neutral density at the wall Nsub(N0) with the impurity ion density Nsub(I) and with Nsub(i) follows the law Nsub(N0) proportional to Nsub(i)Nsub(I)2 in the diffusive regime or Nsub(N0) proportional to Nsub(i)2Nsub(I) in the convective regime. The latter scaling was observed experimentally for plasma parameters corresponding to the convective regime on the F-1 device having a purely poloidal magnetic field B <= 0.5 T, major radius R = 0.3 m, with densities Nsub(i) approximately equal to 4 x 1021 m-3 at electron temperatures of about 5 eV. (Auth.)