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We investigate a cylindrical plasma system with ionization, by an annularbeam of ultraviolet light, taking place only in the cylinder's outer region. Inthe steady state, both the outer and inner regions contain a plasma, with thatin the inner region being uniform and field-free. At the interface between thetwo regions, there is an infinitesimal jump in ion density, the magnitudeapproaching zero in the quasi-neutral $(\lambda_D \rightarrow 0)$ limit. Thesystem offers the possibility of producing a uniform stationary plasma in thelaboratory, hitherto obtained only with thermally produced alkali plasmas.

Cylindrical plasmas generated by an annular beam of ultraviolet light