Abstract
Theory and computer simulation experiments have shown the potential importance of the fluid-like, modified two-stream instability as an ion heating mechanism in low-β plasmas. To take advantage of the strong ion heating which it can produce, we consider inducing the instability with large-amplitude waves in order to convert the energy in the wave fields into ion thermal energy. Since the instability is driven by relative electron-ion drifts across a magnetic field B⃗0, and has a frequency comparable to the lower hybrid frequency ωLH, a natural choice for the driver wave is a magnetosonic wave which propagates across B⃗0 near the Alfvén speed. As a specific example, we demonstrate that for the parameters of the Princeton ST-Tokamak it is theoretically possible to achieve thermonuclear temperatures by anomalously absorbing these waves via the modified two-stream instability.
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