@article{7286,
  author = {I.G.J. Classen and P. Lauber and D. Curran and J. E. Boom and B. J. Tobias and C.W. Domier and N C Luhmann Jr. and H. K. Park and M. G. Munoz and B. Geiger and M. Maraschek and M. A. VanZeeland and S. da Graca},
  title = {Investigation of fast particle driven instabilities by 2D electron cyclotron emission imaging on ASDEX Upgrade},
  abstract = {Detailed measurements of the 2D mode structure of Alfven instabilities in the current ramp-up phase of neutral beam heated discharges were performed on ASDEX Upgrade, using the electron cyclotron emission imaging (ECEI) diagnostic. This paper focuses on the observation of reversed shear Alfven-eigenmodes (RSAEs) and bursting modes that, with the use of the information from ECEI, have been identified as beta-induced Alfven eigenmodes (BAEs). Both RSAEs with first and second radial harmonic mode structures were observed. Calculations with the linear gyro-kinetic code LIGKA revealed that the ratio of the damping rates and the frequency difference between the first and second harmonic modes strongly depended on the shape of the q-profile. The bursting character of the BAE type modes, which were radially localized to rational q surfaces, was observed to sensitively depend on the plasma parameters, ranging from strongly bursting to almost steady state.},
  year = {2011},
  journal = {Plasma Physics and Controlled Fusion},
  volume = {53},
  pages = {124018},
  month = {Dec},
  isbn = {0741-3335},
  doi = {10.1088/0741-3335/53/12/124018},
  language = {English},
}