Radial transport of high-energy ions caused by low-frequency fluctuations in the gamma10 tandem mirror

M. Ichimura, Y. Yamaguchi, R. Ikezoe, Y. Imai, T. Murakami, T. Iwai, T. Yokoyama, T. Sato, Y. Ugajin, T. Imai

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Abstract

Plasmas with high ion-temperature of several keV have been produced by using ion-cyclotron range of frequency (ICRF) heating in the GAMMA 10 tandem mirror. In such high performance plasmas, high and lowfrequency fluctuations are excited and ions trapped in the magnetic field interact with such fluctuations. Three types of wave-particle interactions have been observed in the GAMMA 10 tandem mirror. The turning point diffusion near the ion cyclotron resonance layer has been observed in minimum-B configuration on the anchor cell. Pitch angle scattering of high-energy ions due to the AIC modes and low-frequency waves which have differential frequencies between discrete peaks of the AIC modes are clearly detected. The drift-type fluctuations are clearly observed in the central cell. By using a semiconductor detector, high-energy ions are detected at the radial location far from the plasma edge. The fluctuation, of which frequency is the same as that of drift-type fluctuation, is observed in the signal of high-energy ions. From the pitch angle distribution of the phase differences between both fluctuations, radial transport of high-energy ions caused by drift-type fluctuations near their turning points in the confining mirror field is suggested in the experiments.

Original languageEnglish
Pages (from-to)98-103
Number of pages6
JournalFusion Science and Technology
Volume59
Issue number1 T
DOIs
Publication statusPublished - Jan 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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    Ichimura, M., Yamaguchi, Y., Ikezoe, R., Imai, Y., Murakami, T., Iwai, T., Yokoyama, T., Sato, T., Ugajin, Y., & Imai, T. (2011). Radial transport of high-energy ions caused by low-frequency fluctuations in the gamma10 tandem mirror. Fusion Science and Technology, 59(1 T), 98-103. https://doi.org/10.13182/FST11-A11583