PRODUCTION OF PROBING SUBMICROSECOND HIGH-ENERGY NEUTRAL BEAMS BY MEANS OF A GRID MODULATOR

In order to implement a series of new plasma diagnostics in magnetic c onfinement systems, high-energy probing neutral beams with a microseco nd duration must be produced. The modulation of a plasma emitter of th e ion source of the diagnostic injector by the grid electrode located in front of the plasma electrode of the ion-optical system is studied. Experiments have shown that satisfactory modulation parameters can be achieved by applying a voltage pulse of similar to 50-100 V to the gr id. In test experiments with an ion source having a modulator, a proto n beam with a duration of 400 ns was obtained.