A New ECRH System for ASDEX Upgrade




F.Leuterer, K.Kirov, F.Monaco, M.Münich, H.Schütz, F.Ryter, D.Wagner, R. Wilhelm, H.Zohm, T.Franke, K.Voigt

Max Planck Institut für Plasmaphysik, D-85748 Garching, Germany


1) G.Dammertz, 2) H. Heidinger, 1) K.Koppenburg, 1,3)M. Thumm

 Forschungszentrum Karlsruhe, 1) Institut für Hochleistungsimpuls- und Mikrowellentechnik, 2) Institut für Materialforschung I

D-76021 Karlsruhe, Germany


3) Universität Karlsruhe, Institut für Höchstfrequenztechnik und Elektronik

D-76128 Karlsruhe, Germany


W.Kasparek, G.Gantenbein, H.Hailer, G.A.Müller

Institut  für Plasmaforschung, Universität Stuttgart, D-70569 Stuttgart, Germany


A.Bogdashov, G.Denisov, V.Kurbatov, A.Kuftin, A.Litvak

S. Malygin, E.Tai, V.Zapevalov

Institute of Applied Physics, RAS, 603600 Nizhny Novgorod, Russia



A new ECRH system is currently under construction at ASDEX Upgrade with a total power of  4 MW, generated by 4 gyrotrons, and a pulse length of 10 sec. A particular feature is the use of multifrequency gyrotrons, where the gyrotrons will work either at two frequencies (104/140 GHz) or will be step-tunable in the range 104-140 GHz. The system should allow for central heating at different magnetic fields. It will also give more flexibility for the stabilization of neoclassical tearing modes (NTM) through the possibility of current drive  on the high field side without changing the magnetic field and very localized feedback controlled power deposition with a narrow beamwidth by using a fast steerable launcher.