Electron fishbones: Theory and experimental evidence

F. Zonca, P. Buratti, A. Cardinali, L. Chen, J.-Q. Dong, Y.-X. Long, A.V. Milovanov, F. Romanelli, P. Smeulders, L. Wang, Z.-T. Wang, C. Castaldo, R. Cesario, E. Giovannozzi, M. Marinucci, V. Pericoli Ridolfini

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Abstract

We discuss the processes underlying the excitation of fishbone-like internal kink instabilities driven by supra-thermal electrons generated experimentally by different means: electron cyclotron resonance heating (ECRH) and by lower hybrid (LH) power injection. The peculiarity and interest of exciting these electron fishbones by ECRH only or by LH only is also analysed. Not only is the mode stability explained, but also the transition between steady state nonlinear oscillations to bursting (almost regular) pulsations, as observed in FTU, is interpreted in terms of the LH power input. These results are directly relevant to the investigation of trapped alpha particle interactions with low-frequency MHD modes in burning plasmas: in fact, alpha particles in reactor relevant conditions are characterized by small dimensionless orbits, similarly to electrons; the trapped particle bounce averaged dynamics, meanwhile, depends on energy and not mass. © 2007 IAEA, Vienna.
Original languageEnglish
Pages (from-to)1588 - 1597
Number of pages10
JournalNuclear Fusion
Volume47
Issue number11
DOIs
Publication statusPublished - 2007
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Zonca, F., Buratti, P., Cardinali, A., Chen, L., Dong, J-Q., Long, Y-X., Milovanov, A. V., Romanelli, F., Smeulders, P., Wang, L., Wang, Z-T., Castaldo, C., Cesario, R., Giovannozzi, E., Marinucci, M., & Pericoli Ridolfini, V. (2007). Electron fishbones: Theory and experimental evidence. Nuclear Fusion, 47(11), 1588 - 1597. https://doi.org/10.1088/0029-5515/47/11/022