volume 46, issue 6, PS211-S219 2006
DOI: 10.1088/0029-5515/46/6/s02
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Abstract: The 500-keV negative-ion based neutral beam injector for JT-60U started operation in 1996. The availability of the N-NBI system has been improved gradually through modifying ion source and optimizing its operation parameters. Recently, the extension of the pulse duration up to 30 sec has been intended to study quasi-steady state plasma on JT-60U. The most serious issue is to reduce the heat load on the grids for long pulse operation. Two modifications have been proposed to reduce the heat load. One is to suppr…

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