Direct Observation of the Structure of Global Alfvén Eigenmodes in a Tokamak Plasma
T. E. Evans, P. M. Valanju, J. F. Benesch, Roger D. Bengtson, Y. -M. Li, S. M. Mahajan, M. E. Oakes, D. W. Ross, X. -Z. Wang, J. G. Watkins, and C. M. Surko
Phys. Rev. Lett. 53, 1743 – Published 29 October 1984