| Title | Velocimetry analysis of type-I edge localized mode precursors in ASDEX Upgrade |
| Publication Type | Journal Article |
| Year of Publication | 2014 |
| Authors | P. Manz, J.E Boom, E. Wolfrum, G. Birkenmeier, I.G.J. Classen, N.C Luhmann, Jr., U. Stroth |
| Journal | Plasma Physics and Controlled Fusion |
| Volume | 56 |
| Issue | 3 |
| Pagination | 035010 |
| Date Published | Mar |
| ISBN Number | 0741-3335; 1361-6587 |
| 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. |
| DOI | 10.1088/0741-3335/56/3/035010 |
| Division | FP |
| Department | PDG |
| PID | 1a141e91f9102cfcc78a01ef55826c69 |
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