
Plasma from a fusion reactor is directed along a straight-line path and then converted directly to electrical energy by means of a plurality of parallel arrays of "venetian blind" collector grids, the planes of the arrays being mutually parallel and transverse to the plasma path. A relatively low retarding potential is applied to the first collector grid array for collecting low-energy ions, while successively higher retarding potentials are applied to each succeeding grid array for collecting i...











