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Compensation of beamlet repulsion in a large negative ion source with a multi aperture accelerator

Kashiwagi, Mieko; Inoue, Takashi; Grisham, L. R.*; Hanada, Masaya; Kamada, Masaki; Taniguchi, Masaki; Umeda, Naotaka; Watanabe, Kazuhiro

One of the issues in long pulse operation of large negative ion source with multiaperture accelerator is an excess heat loads on to grids by the beamlet deflection due to their space charge repulsion. To compensate this beamlet deflection, the beamlet steering technique by aperture offset was examined in a three dimensional beam analyses simulating D$$^{-}$$ negative ion source of JT-60U. The result shows that proper aperture offsets of $$leq$$ 1.0 mm were enough to compensate each beamlet deflection. When the magnetic field for suppression of co-extracted electrons was applied, necessary aperture offset of 0.5 mm was necessary for 500 keV D$$^{-}$$ ion beam in JT-60U in addition to the offset for compensation of space charge repulsion. The numerical analyses showed good agreement with the former experimental results and design study.

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