Observation and Modelling of the Onset of Parametric Decay Instabilities during Gyrotron Operation at ASDEX Upgrade

ASDEX Upgrade Team, S. K. Hansen*, S. K. Nielsen, J. Stober, J. Rasmussen, M. Stejner

*Corresponding author for this work

Research output: Contribution to journalConference articleResearchpeer-review

15 Downloads (Pure)

Abstract

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.
Original languageEnglish
Article number02007
JournalEPJ Web of Conferences
Volume203
Number of pages5
ISSN2100-014X
DOIs
Publication statusPublished - 2019
Event20th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating - Greifswald, Germany
Duration: 14 May 201818 May 2018

Workshop

Workshop20th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating
CountryGermany
CityGreifswald
Period14/05/201818/05/2018

Cite this