We investigate parametric decay instabilities (PDIs) occurring for gyrotron radiation near the upper hybrid resonance at the ASDEX Upgrade tokamak. The PDIs are observed through anomalous millimeter-wave scattering which is recorded using the high-resolution, fast acquisition collective Thomson scattering system installed at ASDEX Upgrade, and an experiment in which such observations are made during a scan of the toroidal magnetic field is performed. A previously published theoretical model is used to calculate the gyrotron power necessary to excite PDIs in the experiment; the theoretical model is capable of predicting whether or not PDIs will be observed at a given toroidal magnetic field with a high degree of accuracy.
|Journal||EPJ Web of Conferences|
|Number of pages||5|
|Publication status||Published - 2019|
|Event||20th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating - Greifswald, Germany|
Duration: 14 May 2018 → 18 May 2018
|Workshop||20th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating|
|Period||14/05/2018 → 18/05/2018|