Citation:García-Muñoz, M., Fahrbach, H. U., Günter, S., Igochine, V., Mantsinen, M. J., Maraschek, M., Martin, P., Piovesan, P., Sassenberg, K. and Zohm, H. (2008) 'Fast-ion losses due to high-frequency MHD perturbations in the ASDEX upgrade tokamak', Physical Review Letters, 100(5), 055005 (4pp). doi: 10.1103/PhysRevLett.100.055005
Time-resolved energy and pitch angle measurements of fast-ion losses correlated in frequency and phase with high-frequency magnetohydrodynamic perturbations have been obtained for the first time in a magnetic fusion device and are presented here. A detailed analysis of fast-ion losses due to toroidal Alfven eigenmodes has revealed the existence of a new core-localized magnetohydrodynamic perturbation, the sierpes mode. The sierpes mode is a non-Alfvenic instability which dominates the losses of fast ions in ion cyclotron resonance heated discharges, and it is named for its footprint in the spectrograms ("sierpes" means "snake" in Spanish). The sierpes mode has been reconstructed by means of highly resolved multichord soft-x-ray measurements.
This website uses cookies. By using this website, you consent to the use of cookies in accordance with the UCC Privacy and Cookies Statement. For more information about cookies and how you can disable them, visit our Privacy and Cookies statement