Compact reversed shear tokamak reactor with a superheated steam cycle

K. Okano*, Y. Asaoka, T. Yoshida, M. Furuya, K. Tomabechi, Y. Ogawa, N. Sekimura, R. Hiwatari, T. Yamamoto, T. Ishikawa, Y. Fukai, A. Hatayama, N. Inoue, A. Kohyama, K. Shinya, Y. Murakami, I. Senda, S. Yamazaki, S. Mori, J. AdachiM. Takemoto

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)


The compact reversed shear tokamak CREST is a cost competitive reactor concept based on a reversed shear high β plasma and water cooled ferritic steel components. The moderate aspect ratio A = 3.4 and the elongation κ = 2.0 of CREST are very similar to the case of the ITER advanced mode plasma. Presentation of such a concept based on the ITER project should be worth while for formulating a fusion development strategy. The achievement of a competitive cost of electricity (COE) is the first priority for electric power industries. High β and high thermal efficiency are the most effective parameters for achieving a competitive COE. In order to achieve a high efficiency power plant, a superheated steam cycle has been adopted which permits a high thermal efficiency (η = 41%). Current profile control and high speed plasma rotation by neutral beam current drive stabilize the ideal MHD activity up to the Troyon coefficient βN = 5.5. A cost assessment has shown that CREST could generate about 1.16 GW(e) electric power at a competitive cost.

Original languageEnglish
Pages (from-to)635-646
Number of pages12
JournalNuclear Fusion
Issue numberSPEC. ISS. 3
Publication statusPublished - 2000
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Condensed Matter Physics


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