Development of beam source and bushing for ITER NB system

Inoue, Takashi; Hanada, M.; Kashiwagi, M.; Takeuchi, Masaki; Tobari, H.; Dairaku, M.; Umeda, N.; Watanabe, K.; Sakamoto, K.; Ikeda, Yoshitaka

doi:10.1016/j.fusengdes.2007.05.051

Cited by 5 publications

(1 citation statement)

References 10 publications

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“…5,6) Negative ions with high energy (>100 keV) have higher neutralisation efficiency in comparison with positive ions, 7,8) so that a negative ion-based neutral beam injector (NBI) has been intensively developed to penetrate the beam particles deep inside of the magnetically confined plasmas. To date, negative ion-based NBIs with filament-arc discharge systems have achieved sufficiently well-focused beams with beam divergences of 5 mrad on the JT-60U, 9) and 4.1 mrad and 6.1 mrad in the horizontal and the vertical directions, respectively, on the LHD. 10) On the other hand, the negative ion sources for the ITER project are the RF driven sources developed by the Max-Planck-Institut für Plasmaphysik, Garching.…”

Section: Introductionmentioning

confidence: 99%

Response of beam focusing to plasma fluctuation in a filament-arc-type negative ion source

Haba

Nagaoka

Tsumori

et al. 2020

Jpn. J. Appl. Phys.

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Beam focusing is one of the most important elements for the stable and safe operation of high power negative ion beams, such as neutral beam injection into magnetically confined fusion plasmas. In order to investigate impacts of the source plasma fluctuation on beam focusing, a simultaneous measurement of the source plasma fluctuation and the beam current profile has been carried out in the research-and-development negative ion source at the National Institute for Fusion Science. The responses of beam width and of the beam centre deviation are observed for the first time, indicating the importance of the source plasma stability for the negative ion beam focusing.

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