Electron Current Drive by Fusion-Product-Excited Lower Hybrid Drift Instability

Electron current drive by fusion-product-excited lower hybrid drift instability.

We present first principles simulations of the direct collisionless coupling of the free energy of fusion-born ions into electron current in a magnetically confined fusion plasma. These simulations demonstrate, for the first time, a key building block of some "alpha channeling" scenarios for tokamak experiments. Spontaneously excited obliquely propagating waves in the lower hybrid frequency ran...

Fast Electron Transport In Lower - Hybrid Current Drive

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Nonlinear evolution of the lower-hybrid drift instability in a current sheet.

The lower-hybrid drift instability is simulated in an ion-scale current sheet using a fully kinetic approach with values of the ion to electron mass ratio up to m(i)/m(e)=1836. Although the instability is localized on the edge of the layer, the nonlinear development increases the electron flow velocity in the central region resulting in a strong bifurcation of the current density and significan...

PFC / JA - 86 - 18 The Anomalous Doppler Instability During Lower - Hybrid Current Drive

EX/P6-19 Lower Hybrid and Electron Bernstein Wave Current Drive Experiments in MST

Inductive current profile modification in MST has been successful in reducing fluctuations and transport but is transient and radially non-localized. Current profile control with rf waves offers steady and more precise control. Studies of lower hybrid wave and electron Bernstein wave injection are underway. The lower hybrid antenna has coupled 125 kW to the plasma. Hard x-ray emission with ener...