The paper describes experimental work performed in this field on FTU tokamak, and it deals in particular with the implementation of a system for automatic detection of TM onset, and stabilizing reaction with ECH/ECCD. The system is composed by a particular arrangement of the 140 GHz, 2 MW ECH set-up, and a DSP-based (Digital Signal Processor) unit for the analysis of ECE and Mirnov data, and for the control of gyrotron power supplies. The detection/reaction system, successfully tested in the experiments described in the paper, is very fast since no mirror motion is foreseen. This might be a possible scheme for a fast reaction to "early warning" NTM suppression in fusion devices, in which the application of ECCD, localized on the O-point radial position, is performed as soon as the seed island is detected and much before it reaches saturation. ITER perspectives are discussed.
Dynamic Control Of The Current Density Profile And MHD Instabilities By ECH/ECCD In Tokamaks
Cirant S;Lazzaro E;Gandini F;Granucci G;Mellera V;Muzzini V;
2006
Abstract
The paper describes experimental work performed in this field on FTU tokamak, and it deals in particular with the implementation of a system for automatic detection of TM onset, and stabilizing reaction with ECH/ECCD. The system is composed by a particular arrangement of the 140 GHz, 2 MW ECH set-up, and a DSP-based (Digital Signal Processor) unit for the analysis of ECE and Mirnov data, and for the control of gyrotron power supplies. The detection/reaction system, successfully tested in the experiments described in the paper, is very fast since no mirror motion is foreseen. This might be a possible scheme for a fast reaction to "early warning" NTM suppression in fusion devices, in which the application of ECCD, localized on the O-point radial position, is performed as soon as the seed island is detected and much before it reaches saturation. ITER perspectives are discussed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
