Nonlinear 2-D effects in the control of magnetic Islands by ECCD

Enzo Lazzaro, Dario Borgogno, Luca Comisso, Daniela Grasso

Research output: Contribution to conferencePaper

3 Citations (Scopus)

Abstract

The stabilization of tearing magnetic islands by means of localized current driven by electron cyclotron waves, requires optimizing the efficiency of the injected helical current. The problem is conventionally addressed using 0-D model of the (generalized) Rutherford equation to find the dependence in terms of the island width, wave beam width and deposition scale length, as well as phase tracking requirements. The use of a 2-D reconnection model shows that both the early time response of a tearing unstable system to ECCD and important nonlinear processes lead to irreversible modifications on the 2-D configuration, where «phase» and «width» of an island cease to be observable and controllable state variables. In particular the occurrence of a phase instability and of multiple axis and current sheets, may be a serious impediment for feedback control schemes. © 2014 AIP Publishing LLC.
Original languageEnglish
DOIs
Publication statusPublished - 2014
Externally publishedYes
Event20th Topical Conference on Radiofrequency Power in Plasmas - , Italy
Duration: 1 Jan 2014 → …

Conference

Conference20th Topical Conference on Radiofrequency Power in Plasmas
CountryItaly
Period1/1/14 → …

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Lazzaro, E., Borgogno, D., Comisso, L., & Grasso, D. (2014). Nonlinear 2-D effects in the control of magnetic Islands by ECCD. Paper presented at 20th Topical Conference on Radiofrequency Power in Plasmas, Italy. https://doi.org/10.1063/1.4864601