|Title||Real-time control of tearing modes using a line-of-sight electron cyclotron emission diagnostic|
|Publication Type||Journal Article|
|Year of Publication||2010|
|Authors||B.A. Hennen, E. Westerhof, P Nuij, J.W Oosterbeek, MR de Baar, W.A Bongers, A. Burger, D.J Thoen, M. Steinbuch|
|Journal||Plasma Physics and Controlled Fusion|
|Type of Article||Article|
|Keywords||DISCHARGES, LIMITS, STABILIZATION, SYSTEM, TEXTOR, TOKAMAK|
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|
|Alternate Title||Plasma Phys. Control. Fusion|
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