The focus of the present research is the control of rotating magnetic islands of low helical mode numbers (m,n) in thermonuclear plasmas. These perturbations are associated with local distortions of the current profile that can be a serious cause of degradation of the plasma confinement. The islands are reduced in width or completely suppressed by restoring the unperturbed current profile. The current can be driven by the deposition of radio frequency power within the island. Traditionally MHD instabilities are monitored by external magnetic signals that however give no information about the radial location of the perturbation within the plasma. Because temperature fluctuation is also associated to the MHD instabilities, ECE (Electron Cyclotron Emission) signals, that give information about local electron temperature, are used to identify the islands position. Here we describe the design of a real time diagnostics/control device using an original algorithm for an effective control action that involves identification of relevant state variables (radial location, island amplitude, frequency and phase) in "real time" and varies accordingly the control variables (wave beam power modulation and steering angles).
|Publication status||Published - 2004|
|Event||Proceedings of the 21st IEEE Instrumentation and Measurement Technology Conference, IMTC/04 - , Italy|
Duration: 1 Jan 2004 → …
|Conference||Proceedings of the 21st IEEE Instrumentation and Measurement Technology Conference, IMTC/04|
|Period||1/1/04 → …|
All Science Journal Classification (ASJC) codes
Berrino, J., Cirant, S., Dí Antona, G., & Lazzaro, E. (2004). Radial identification of tearing modes in a tokamak. Paper presented at Proceedings of the 21st IEEE Instrumentation and Measurement Technology Conference, IMTC/04, Italy. https://doi.org/10.1109/IMTC.2004.1351333