Abstract
The large high current ICP negative (H−, D−) ion sources will produce the neutral beams needed for fusion plasma heating in ITER. To reach very high intensity negative ion beams a cesium coated surface of the plasma grid is usually used. The cesium coating, however, poses some problem in the maintenance and operation of the ion source and for that alternative ways to enhance the ion current extraction should be investigated. An alternative way to enhance the beam current could be the use of a Planar Ion Funnel (PIF) extraction system recently proposed for applications where a very high extraction efficiency are required [1]. In this contribution the idea of applying the PIF extraction in an ICP negative ion source to further increase the ion current extracted will be discussed. Some trajectory simulations to better show the goodness of this proposal will also be presented.
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