Operating modes in EBT

The various operating modes can be distinguished in several ways. In this paper the distinction will be made on the condition of the hot electron rings. In the C-mode, which occurs at high neutral pressures, the core plasma is relatively cold and the rings are very weak. In the T-mode, at intermediate pressures, the rings have appreciable beta (3 to 20%) and the core properties are more significant: T/sub e/ approx. 400 eV, n/sub e/ approx. 1018 m-3. At the lowest pressures, in the M-mode, the ring beta fluctuates and the core plasma density is modulated