Comprehensive kinetic analysis of the plasma-wall transition layer in a strongly tilted magnetic field
Tskhakaya, D. D. ; Kos, Leon, 1966-
The magnetized plasma-wall transition (MPWT) layer at the presence of the obliquity of the magnetic field to the wall consists of three sub-layers: the Debye sheath (DS), the magnetic pre-sheath ...(MPS), and the collisional pre-sheath (CPS) with characteristic lengths lambdaD (electron Debye length), rhoi (ion gyro-radius), and l (the smallest relevant collision length), respectively. Tokamak plasmas are usually assumed to have the ordering lambda D << rho i << l , when the above-mentioned sub-layers can be distinctly distinguished. In the limits of epsilon D m ( lambda D / rho i ) --> 0 and epsilon m c ( rho i / l ) --> 0 ("asymptotic three-scale (A3S) limits"), these sub-layers are precisely defined. Using the smallness of the tilting angle of the magnetic field to the wall, the ion distribution functions are found for three sub-regions in the analytic form. The equations and characteristic length-scales governing the transition (intermediate) regions between the neighboring sub-layers (CPS - MPS and MPS - DS) are derived, allowing to avoid the singularities arising from the epsilon D m --> 0 and epsilon m c --> 0 approximations. The MPS entrance and the related kinetic form of the Bohm-Chodura condition are successfully defined for the first time. At the DS entrance, the Bohm condition maintains its usual form. The results encourage further study and understanding of physics of the MPWT layers in the modern plasma facilities.
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