Abstract
A tokamak discharge has been formed and maintained through helicity injection, by use of only an external dc low-energy electron beam. The discharge, in a 5-kG toroidal field, evolved to a steady-state circular cross section with q(a)=10, q(0)=4, which was maintained for more than 400 L/R periods, the time (60 msec) limited by the cathode bias supply. The density profile reached a line-averaged n${\ifmmode\bar\else\textasciimacron\fi{}}_{e}$=2\ifmmode\times\else\texttimes\fi{}${10}^{13}$ ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}3}$, while ${T}_{e}$=25 eV and ${T}_{i}$=15 eV. Strong central peaking occurs and inward pinching is indicated for both density and current.
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