Observations of neutral beam and ICRF tail ion losses due to Alfvén modes in TFTR

D. S. Darrow, S. J. Zweben, Z. Chang, C. Z. Cheng, M. D. Diesso, E. D. Fredrickson, E. Mazzucato, R. Nazikian, C. K. Phillips, S. Popovichev, M. H. Redi, R. B. White, J. R. Wilson, K. L. Wong

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Abstract

Experimental observations from TFTR of fast ion losses resulting from the toroidicity induced Alfvén eigenmode (TAE) and the Alfvén frequency mode (AFM) are presented. The AFM was driven by neutral beam ions, at low BT and the TAE was excited by hydrogen minority ion cyclotron range of frequencies (ICRF) tail ions at higher BT. The measurements indicate that the loss rate varies linearly with the mode amplitude for both modes, and that the fast ion losses during the mode activity can be significant, with tens of per cent of the input power lost in the worst cases.

Original languageEnglish
Pages (from-to)939-954
Number of pages16
JournalNuclear Fusion
Volume37
Issue number7
DOIs
Publication statusPublished - 1997 Jul

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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    Darrow, D. S., Zweben, S. J., Chang, Z., Cheng, C. Z., Diesso, M. D., Fredrickson, E. D., Mazzucato, E., Nazikian, R., Phillips, C. K., Popovichev, S., Redi, M. H., White, R. B., Wilson, J. R., & Wong, K. L. (1997). Observations of neutral beam and ICRF tail ion losses due to Alfvén modes in TFTR. Nuclear Fusion, 37(7), 939-954. https://doi.org/10.1088/0029-5515/37/7/I03