Effects of filament geometry on the arc efficiency of a high-intensity He+ ion source

Kobuchi, T.; Kisaki, M.; Shinto, K.; Okamoto, A.; Kitajima, S.; Sasao, M.; Tsumori, K.; Kaneko, O.; Sakakita, H.; Kiyama, S.; Hirano, Y.; Wada, M.
October 2008
Review of Scientific Instruments;Oct2008, Vol. 79 Issue 10, p10F316
Academic Journal
A strongly focusing high-intensity He+ ion source equipped with three concave electrodes has been designed and constructed as the beam source for a high-energy He0 neutral beam probe system to diagnose fusion-produced alpha particles in thermonuclear fusion plasmas. The reduction of heat load onto the concave extraction electrodes is particularly important for a long pulse operation, as the heat load deforms the electrodes and thus the beam focal length. The effects on the arc efficiency (beam current/arc power) of the ion source due to the discharge filament structure (straight-type and L-shape-type filaments), size (filament diameters of 2 and 1.5 mm), number, and the locations have been studied. Choice of the appropriate filament structure improved the arc efficiency by 17%.


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