Progress in development and design of the neutral beam injector for JT-60SA

Authors :: Hanada, M.
Kojima, A.
Tanaka, Y.
Inoue, T.
Watanabe, K.
Taniguchi, M.
Kashiwagi, M.
Tobari, H.
Umeda, N.
Akino, N.
Kazawa, M.
Oasa, K.
Komata, M.
Usui, K.
Mogaki, K.
Sasaki, S.
Kikuchi, K.
Nemoto, S.
Oshima, K.
Endo, Y.
Source :: Fusion Engineering & Design. Oct2011, Vol. 86 Issue 6-8, p835-838. 4p.
Publication Year :: 2011
Abstract: Abstract: Neutral beam (NB) injectors for JT-60 Super Advanced (JT-60SA) have been designed and developed. Twelve positive-ion-based and one negative-ion-based NB injectors are allocated to inject 30MW D0 beams in total for 100s. Each of the positive-ion-based NB injector is designed to inject 1.7MW for 100s at 85keV. A part of the power supplies and magnetic shield utilized on JT-60U are upgraded and reused on JT-60SA. To realize the negative-ion-based NB injector for JT-60SA where the injection of 500keV, 10MW D0 beams for 100s is required, R&Ds of the negative ion source have been carried out. High-energy negative ion beams of 490–500keV have been successfully produced at a beam current of 1–2.8A through 20% of the total ion extraction area, by improving voltage holding capability of the ion source. This is the first demonstration of a high-current negative ion acceleration of >1A to 500keV. The design of the power supplies and the beamline is also in progress. The procurement of the acceleration power supply starts in 2010. [Copyright &y& Elsevier]