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Report No.
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Optimization of the accelerators for the ITER neutral beam injector project

Antoni, V.*; Agostinetti, P.*; Cavenago, M.*; DeEsch, H. P. L.*; Fubiani, G.*; Pilan, N.*; Serianni, G.*; Veltri, P.*; NBI RFX Team*; Kashiwagi, Mieko; Taniguchi, Masaki; Umeda, Naotaka; Inoue, Takashi

In order to deliver a total of 33 MW of auxiliary heating power, each of the two Neutral Beam Injectors (NBI) foreseen for ITER is designed to provide acceleration up to 1 MV of a 40 A current of Deuterium negative ions. The status of the project will be reviewed focusing on the aspects related to the ion acceleration. As the reference design, a Multi Aperture Multi Grid (MAMuG) accelerator with five grids was adapted. In order to speed up the test of the system, the NBI Test facility in Padova will host a dedicated experiment aimed to optimise the Radio Frequency negative ion source. In physics design of accelerator, the particle (ions and electrons) acceleration and the interaction of the ions with the background gas and the grid surfaces are described by using a Monte Carlo programme. The thermo-mechanical analysis of the grids has been performed taking into account the power load due to co-extracted and secondary electrons.

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