Plasma and Fusion Research
Online ISSN : 1880-6821
ISSN-L : 1880-6821
Regular Articles
Behavior of Negative Ion and Secondary Particles in Multi-Aperture Accelerator
Masashi KISAKIPierluigi VELTRIPiero AGOSTINETTIKatsuyoshi TSUMORIKatsunori IKEDAHaruhisa NAKANOGianluigi SERIANNIMasaki OSAKABEKenichi NAGAOKAYasuhiko TAKEIRIOsamu KANEKO
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2013 Volume 8 Pages 2405060

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Abstract

The trajectories of the Hand the secondary particle in a multi-aperture accelerator for negative ion sources were calculated with a 3D numerical code, taking into account non-uniformity in magnetic field and negative ion density, and the heat loading on acceleration grids was estimated. The heat loading on a grounded grid mainly originates from the secondary electron impact and the non-uniform transverse magnetic field enhances the possibility of the secondary electron impacts on the grounded grid. Perveance condition of beamlets strongly depends on the plasma density profile and the direct interception of the Hby an extraction grid is enhanced in the non-uniform plasma case.

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© 2013 by The Japan Society of Plasma Science and Nuclear Fusion Research
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