Improvement of JT-60U Negative Ion Source Performance

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The negative ion neutral beam system now operating on JT-60U was the first application of negative ion technology to the production of beams of high current and power for conversion to neutral beams, and has successfully demonstrated the feasibility of negative ion beam heating systems for ITER and future tokamak reactors [1, 2]. It also demonstrated significant electron heating[3] and high current drive efficiency in JT-60U[4]. Because this was such a large advance in the state of the art with respect to all system parameters, many new physical processes appeared during the earlier phases of the beam injection experiments. We ... continued below

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372 Kilobytes pages

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Grisham, L.R.; Kuriyama, M.; Kawai, M.; Itoh, T.; Umeda, N. & Team, JT-60U November 15, 2000.

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The negative ion neutral beam system now operating on JT-60U was the first application of negative ion technology to the production of beams of high current and power for conversion to neutral beams, and has successfully demonstrated the feasibility of negative ion beam heating systems for ITER and future tokamak reactors [1, 2]. It also demonstrated significant electron heating[3] and high current drive efficiency in JT-60U[4]. Because this was such a large advance in the state of the art with respect to all system parameters, many new physical processes appeared during the earlier phases of the beam injection experiments. We have explored the physical mechanisms responsible for these processes, and implemented solutions for some of them, in particular excessive beam stripping, the secular dependence of the arc and beam parameters, and nonuniformity of the plasma illuminating the beam extraction grid. This has reduced the percentage of beam heat loading on the downstream grids by roug hly a third, and permitted longer beam pulses at higher powers. Progress is being made in improving the negative ion current density, and in coping with the sensitivity of the cesium in the ion sources to oxidation by tiny air or water leaks, and the cathode operation is being altered.

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372 Kilobytes pages

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INIS; OSTI as DE00768650

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  • 18th International Atomic Energy Agency's (IAEA) Fusion Energy Conference (FEC-2000), Sorrento (IT), 10/04/2000--10/10/2000

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  • Report No.: PPPL-3507
  • Grant Number: AC02-76CH03073
  • Office of Scientific & Technical Information Report Number: 768650
  • Archival Resource Key: ark:/67531/metadc719467

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  • November 15, 2000

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 15, 2016, 7:34 p.m.

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Grisham, L.R.; Kuriyama, M.; Kawai, M.; Itoh, T.; Umeda, N. & Team, JT-60U. Improvement of JT-60U Negative Ion Source Performance, article, November 15, 2000; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc719467/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.