@article{7927,
  author = {P. Manz and J. E. Boom and E. Wolfrum and G. Birkenmeier and I.G.J. Classen and N. C. Luhmann Jr. and U. Stroth},
  title = {Velocimetry analysis of type-I edge localized mode precursors in ASDEX Upgrade},
  abstract = {When the electron transport barrier remains in its final shape before a type-I edge localized mode (ELM) crash in ASDEX Upgrade, ELM precursors appear as electron temperature fluctuations. In order to relate these precursors to an instability, spatial scales, parity and the cross-phase between electron temperature and radial velocity fluctuations are evaluated by means of velocimetry of measured 2D electron temperature fluctuations. A comprehensive comparison with properties of different instabilities points to microtearing modes. Bispectral analysis indicates a nonlinear coupling of these precursors to a ballooning-type mode prior to the ELM onset.},
  year = {2014},
  journal = {Plasma Physics and Controlled Fusion},
  volume = {56},
  pages = {035010},
  month = {Mar},
  isbn = {0741-3335; 1361-6587},
  doi = {10.1088/0741-3335/56/3/035010},
  language = {eng},
}