High current H− ion production in cesium seeded large ion sources
- 1 April 1994
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 65 (4) , 1195-1197
- https://doi.org/10.1063/1.1145055
Abstract
The characteristics of a large negative‐ion source with external filter is investigated for the neutral‐beam injection system in a large helical device. The magnetic cusp field is set up at almost the same strength as that in our well optimized 1/3 ion source with rod‐type magnetic filter. An H− ion current of 5.2 A is extracted from the ion source with Cs seeding. The H− current corresponds to 19.7 mA/cm2, and the value is comparable to the current density obtained using the 1/3 scaled ion source with a rod‐type magnetic filter at the same extraction voltage. In low operating pressure, the ion source with the external filter has a better performance on the extraction of H− ions.Keywords
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