Real-time control of tearing modes using a line-of-sight electron cyclotron emission diagnostic

TitleReal-time control of tearing modes using a line-of-sight electron cyclotron emission diagnostic
Publication TypeJournal Article
Year of Publication2010
AuthorsB.A. Hennen, E. Westerhof, P Nuij, J.W Oosterbeek, MR de Baar, W.A Bongers, A. Burger, D.J Thoen, M. Steinbuch
JournalPlasma Physics and Controlled Fusion
Volume52
Number10
Pagination20
Date PublishedOct
Type of ArticleArticle
ISBN Number0741-3335
Accession NumberISI:000283391000008
KeywordsDISCHARGES, LIMITS, STABILIZATION, SYSTEM, TEXTOR, TOKAMAK
Abstract

The stability and performance of tokamak plasmas are limited by instabilities such as neoclassical tearing modes. This paper reports on an experimental proof of principle of a feedback control approach for real-time, autonomous suppression and stabilization of tearing modes in a tokamak. The system combines an electron cyclotron emission diagnostic for sensing of the tearing modes in the same sight line with a steerable electron cyclotron resonance heating and current drive (ECRH/ECCD) antenna. A methodology for fast detection of q = m/n = 2/1 tearing modes and retrieval of their location, rotation frequency and phase is presented. Set-points to establish alignment of the ECRH/ECCD deposition location with the centre of the tearing mode are generated in real time and forwarded in closed loop to the steerable launcher and as a modulation pulse train to the gyrotron. Experimental results demonstrate the capability of the control system to track externally perturbed tearing modes in real time.

URL<Go to ISI>://000283391000008
Division

Fusion Physics

PID

e04ea436f27a7803143987ee114348b1

Alternate TitlePlasma Phys. Control. Fusion

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