First wall issues related with energetic particle deposition in a tokamak fusion power reactor

K. Tobita, S. Nishio, S. Konishi, M. Sato, T. Tanabe, K. Masaki, N. Miya

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Energetic particle deposition to the wall due to toroidal magnetic field (TF) ripple was assessed for a 2 GW fusion power reactor. When the present allowance for the loss is applied, the alpha particle flux to the wall can be as high as 2×1018 m-2 s-1 in the reactor, eroding tungsten by ∼20 μm per year. The peak particle fluence over a 2-year operation cycle can reach 1026 m-2, probably being larger than a critical fluence for blister formation. The result suggests that, for the steady-state tokamak fusion reactor, we should introduce a new design methodology of determining an acceptable level of TF ripple on the basis of particle fluence to the wall, instead of the present one based on a tolerable heat flux.

Original languageEnglish
Pages (from-to)561-568
Number of pages8
JournalFusion Engineering and Design
Volume65
Issue number4
DOIs
Publication statusPublished - 2003 Jul 1
Externally publishedYes

Keywords

  • Alpha particle
  • Blistering
  • Erosion
  • Fusion reactor
  • Physical sputtering
  • Plasma wall interaction
  • Ripple loss
  • Tritium retention

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

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