Abstract
The ELMO Bumpy Torus (EBT) is a hybrid magnetic trap formed by a series of toroidally connected simple mirrors. It differs from a tokamak, the present mainline approach, in that plasma stability and heating are obtained in a current‐free geometry by the application of steady‐state, high‐power, electron cyclotron resonance heating (ECH) producing a steady‐state plasma. The primary motivation for EBT confinement research is the potential for a steady‐state, highly accessible reactor with high beta. In the present EBT‐I/Scale device (EBT‐I/S), electron confinement has been observed to agree with the predictions of theory. The major emphasis of the experimental program is on the further scaling of plasma parameters in the EBT‐I/S machine with ECH frequency (10.6, 18, and 28 GHz), resonant magnetic field (0.3, 0.6, and 1 T), and heating power (30, 60, and 200 kW). In addition, substantial efforts are under way or planned in the areas of ion cyclotron heating, neutral beam heating, plasma‐wall interactions, impurity control, synchrotron radiation, and divertors. Recently, EBT has been selected as the first alternate concept to be advanced to the proof‐of‐principle stage; this entails a major device scale‐up to allow a reasonable extrapolation to a DT‐burning facility. The status and future plans of the EBT program, in particular the EBT proof‐of‐principle experiment (EBT‐P), are discussed.
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