Recent Alfv\'{e}n Eigenmode measurements on JET
POSTER
Abstract
Alfv\'{e}n Eigenmodes (AE) have been observed in the latest JET campaigns, excited by ICRH-driven fast particles in D and DH plasmas. The detection of AEs allows determination of isotope abundance in recent experiments with mixed ion composition plasmas. A major upgrade to the Toroidal Alfv\'{e}n Eigenmode Active Antenna diagnostic at JET has opened the possibility to probe AEs with a wide range of toroidal mode numbers n and quantify their damping rate. A new 4 kW amplifier has been installed for each of six antennas to increase the output power and allow real time control of the relative phasing between the antennas. The diagnostic will be used to study the damping of alpha-driven AEs during the DT campaign planned on JET in support of ITER. Simulations with the MISHKA code are used to interpret the frequencies and radial localization of AEs.
*This work has been carried out within the framework of the EUROfusion Consortium grant 633053. Support for the US group was provided by the US DOE, the Brazilian group from the FAPESP Project 2011/50773-0, and the Swiss group in part by the Swiss NSF.