Author :
Wagner, D.H. ; Grunwald, G. ; Leuterer, F. ; Manini, A. ; Monaco, F. ; Munich, M.J. ; Schutz, H. ; Stober, J. ; Zohm, H. ; Franke, T. ; Thumm, M. ; Heidinger, R. ; Gantenbein, G. ; Meier, A. ; Kasparek, W. ; Lechte, C. ; Litvak, A.G. ; Denisov, G.G. ; Chi
Abstract :
A new multifrequency electron cyclotron resonance heating system is under construction for the Axially Symmetric Divertor Experiment (ASDEX) Upgrade tokamak experiment. For the first time in a fusion device, this system employs multifrequency gyrotrons that are step-tunable in the range 105-140 GHz. In its final stage the system will consist of four gyrotrons with a total power of 4 MW and a pulselength of 10 s. The first two gyrotrons, working at 105 and 140 GHz, were installed and tested. Transmission line elements such as corrugated waveguides, polarizer mirrors and vacuum windows are designed to cope with this frequency band. The system includes fast steerable launchers at the front end that will allow for localized feedback-controlled power deposition in the plasma.
Keywords :
Tokamak devices; gyrotrons; plasma radiofrequency heating; plasma toroidal confinement; waveguides; ASDEX Upgrade; Axially Symmetric Divertor Experiment Upgrade tokamak; ECRH; corrugated waveguides; frequency 105 GHz to 140 GHz; fusion device; gyrotrons; localized feedback-controlled power deposition; multifrequency electron cyclotron resonance heating; polarizer mirrors; power 4 MW; steerable launchers; time 10 s; transmission line elements; vacuum windows; Cyclotrons; Electrons; Gyrotrons; Heating; Polarization; Power transmission lines; Resonance; Testing; Tokamaks; Variable speed drives; Electron cyclotron resonance heating (ECRH); fast steerable launcher; step-tunable gyrotron;
