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Updated: Mar 24, 2026

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
Published on: May 3, 2019
Improvement of accelerator of negative ion source on the Large Helical Device
M Kisaki1, K Ikeda1, M Osakabe1
1National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan.
Abstract:
To improve the performance of negative-ion based neutral beam injection on the Large Helical Device, the accelerator was modified on the basis of numerical investigations. A field limiting ring was installed on the upper side of a grounded grid (GG) support and a multi-slot GG was adopted instead of a multi-aperture GG. As a result, the voltage holding capability is improved and the heat load on the GG decreases by 40%. In addition, the arc efficiency is improved significantly only by replacing the GG.
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