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Studies of H − source for large helical device-neutral beam injector (invited)

Oka, Y. ; Tsumori, K. ; Takeiri, Y. ; Ikeda, K. ; Kaneko, O. ; Nagaoka, K. ; Osakabe, M. ; Asano, E. ; Kawamoto, T. ; Kondo, T. ; Sato, M. ; Grisham, L. ; Honda, A. ; Umeda, N. ; Yamamoto, T.

Papers From the 10th International Conference on Ion Sources (Icis), Dubna (Russia) (September, 2003): Review of Scientific Instruments, May 2004, Vol.75(5), pp.1803-1808 [Periódico revisado por pares]

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  • Título:
    Studies of H − source for large helical device-neutral beam injector (invited)
  • Autor: Oka, Y. ; Tsumori, K. ; Takeiri, Y. ; Ikeda, K. ; Kaneko, O. ; Nagaoka, K. ; Osakabe, M. ; Asano, E. ; Kawamoto, T. ; Kondo, T. ; Sato, M. ; Grisham, L. ; Honda, A. ; Umeda, N. ; Yamamoto, T.
  • Assuntos: Proceedings of the 10th International Conference on Ion Sources
  • É parte de: Papers From the 10th International Conference on Ion Sources (Icis), Dubna (Russia) (September, 2003):;
    Review of Scientific Instruments, May 2004, Vol.75(5), pp.1803-1808
  • Descrição: A powerful neutral beam system with six high current H − ion sources achieved a total power of 10.3 MW in the large helical device (LHD). We describe the present status of the ion sources, and the results of studies of cesium consumption, tungsten filament lifetime, and the velocity spectrum of the beam. Maximum power and beam energy in those ion sources range from 3.5 to 4.4 MW and 165 to 180 keV (design energy), respectively. The maximum H − current is ∼25 A. Much progress on beam acceleration and plasma uniformity was facilitated by a new accelerator and new arc power supply system with careful Cs seeding. Cs consumption for 1/2 year of operation ranges from 3.9 to 10.6 g per one source (over 2×10 4 shots). It is converted to the rate of 0.17–1.5 mg per one shot per source. It is considered that Cs deposition on the inside surface of the plasma source could be from 0.11 to 1.0 monolayer per one shot per source. This is of the same order as the expected optimum coverage of ∼0.7. Filament weight loss was measured in each source. Filaments have to be exchanged every 1–3 months (i.e., ∼10 4 shots). The filament lifetime cycle, instead of the Cs consumption, determines the maintenance cycle. Distribution of the filament weight loss in each source is nonuniform. The distribution changed after adjusting the arc current distribution to each filament for optimized H − uniformity by an independently adjustable multiarc power supply system and filament supplies. Tungsten deposition is from 0.015 to 0.065 monolayer per shot per source. This is smaller than the Cs deposition. Doppler shift spectroscopy yielded the first velocity spectrum for the LHD-neutral beam injector beam.
  • Idioma: Inglês

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