Computer tomography of M=1 mode during sawtooth oscillation with three soft x-ray detector arrays on the WT-3 tokamak

K. Hanada, K. Ogura, S. Ide, H. Tanaka, M. Iida, T. Ito, M. Iwamasa, M. Yoshida, T. Minami, M. Nakamura, T. Maekawa, Y. Terumichi, S. Tanaka

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Soft X-rays (SXRs) emitted from plasma in the WT-3 tokamak were measured by three SXR detector arrays, viewing the plasma from three different angles. From these experimental data, the authors reconstructed the two dimensional (2-D) contour of constant SXR emissivity as a function of time, using the technique of computer tomography (CT). Computer simulation results show that data from three or more sets of detector arrays are required to reconstruct the 2-D emissivity structure with sufficient accuracy to distinguish Kadomtsev's model from the quasi-interchange (Wesson's) model of sawtooth crash. Further, it is shown that if the noise amplitude is more than 1.5%, reconstruction of the real 2-D SXR emissivity structure is difficult.

Original languageEnglish
Article number003
Pages (from-to)1289-1299
Number of pages11
JournalPlasma Physics and Controlled Fusion
Issue number14
Publication statusPublished - Dec 1 1990
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

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