14-16 March 2016
INFN Laboratori Nazionali di Legnaro
Europe/Rome timezone

High current negative ion source with Planar Funnel extraction grid

14 Mar 2016, 16:35
2h 40m
Cafeteria Hall (INFN Laboratori Nazionali di Legnaro)

Cafeteria Hall

INFN Laboratori Nazionali di Legnaro


Vincenzo Variale (INFN-BA)


High current large negative (H-, D-) ion sources will produce the neutral beams needed for fusion plasma heating in ITER. To reach very high 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 Funnel Extraction (PFE) grid recently proposed for applications where a very high extraction efficiency are required [1]. In this contribution the idea of applying the PFE to a negative ion source instead of the cesium coating will be discussed. [1] A. Chaudhary et al., Review of Scientific Instruments 85, 105101 (2014); doi: 10.1063/1.4897480
If a proceedings is prepared,<br></br> will you submit a contribution? yes

Primary author

Vincenzo Variale (INFN-BA)

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