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

B.A. Hennen; E. Westerhof; P.W.J.M. Nuij; J.W. Oosterbeek; M.R. Baar, de; W.A. Bongers; A. Bürger; D.J. Thoen; M. Steinbuch

doi:10.1088/0741-3335/52/10/104006

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

B.A. Hennen, E. Westerhof, P.W.J.M. Nuij, J.W. Oosterbeek, M.R. Baar, de, W.A. Bongers, A. Bürger, D.J. Thoen, M. Steinbuch

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Abstract

The stability and performance of tokamak plasmas is 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 (ECE) 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.

Original language	English
Article number	104006
Pages (from-to)	104006-1/20
Number of pages	20
Journal	Plasma Physics and Controlled Fusion
Volume	52
Issue number	10
DOIs	https://doi.org/10.1088/0741-3335/52/10/104006
Publication status	Published - 2010

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Hennen, B. A., Westerhof, E., Nuij, P. W. J. M., Oosterbeek, J. W., Baar, de, M. R., Bongers, W. A., Bürger, A., Thoen, D. J., & Steinbuch, M. (2010). Real-time control of tearing modes using a line-of-sight electron cyclotron emission diagnostic. Plasma Physics and Controlled Fusion, 52(10), 104006-1/20. Article 104006. https://doi.org/10.1088/0741-3335/52/10/104006

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abstract = "The stability and performance of tokamak plasmas is 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 (ECE) 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.",

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T1 - Real-time control of tearing modes using a line-of-sight electron cyclotron emission diagnostic

AU - Hennen, B.A.

AU - Westerhof, E.

AU - Nuij, P.W.J.M.

AU - Oosterbeek, J.W.

AU - Baar, de, M.R.

AU - Bongers, W.A.

AU - Bürger, A.

AU - Thoen, D.J.

AU - Steinbuch, M.

PY - 2010

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N2 - The stability and performance of tokamak plasmas is 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 (ECE) 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.

AB - The stability and performance of tokamak plasmas is 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 (ECE) 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.

U2 - 10.1088/0741-3335/52/10/104006

DO - 10.1088/0741-3335/52/10/104006

M3 - Article

SN - 0741-3335

VL - 52

SP - 104006-1/20

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 10

M1 - 104006

ER -

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

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