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Magnetic island suppression by electron cyclotron current drive as converse of a forced reconnection problem

Part of: Focus on Fusion PLA 17th European Fusion Theory Conference

Published online by Cambridge University Press:  14 June 2018

D. Grasso Open the ORCID record for D. Grasso [Opens in a new window] ,
D. Borgogno ,
L. Comisso Open the ORCID record for L. Comisso [Opens in a new window]  and
E. Lazzaro
D. Grasso*
Affiliation:
Istituto dei Sistemi Complessi - CNR and Dipartimento di Energia, Politecnico di Torino, Torino 10129, Italy
D. Borgogno
Affiliation:
Dipartimento di Energia, Politecnico di Torino, Torino 10129, Italy
L. Comisso
Affiliation:
Department of Astrophysical Sciences and Princeton Plasma Physics Laboratory, Princeton University, Princeton, NJ 08544, USA
E. Lazzaro
Affiliation:
Istituto Fisica del Plasma CNR, Via R. Cozzi 53, 20125 Milano, Italy
*
†Email address for correspondence: daniela.grasso@infm.polito.it
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Abstract

This paper addresses one aspect of the problem of the suppression of tearing mode magnetic islands by electron cyclotron current drive (ECCD) injection, formulating the problem as the converse of a forced reconnection problem. New physical conditions are discussed which should be considered in the technical approach towards a robust control strategy. Limits on the ECCD deposition are determined to avoid driving the system into regimes where secondary instabilities develop. Numerical simulations confirming the theory are also presented.

Keywords

plasma instabilitiesplasma nonlinear phenomenaplasma simulation
Type
Research Article
Information
Journal of Plasma Physics , Volume 84 , Issue 3 , June 2018 , 745840302
Copyright
© Cambridge University Press 2018 

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Footnotes

‡

Present address: Department of Astronomy and Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027, USA.

References

Borgogno, D., Comisso, L., Grasso, D. & Lazzaro, E. 2014 Nonlinear response of magnetic islands to localized electron cyclotron current injection. Phys. Plasmas 21, 060704.CrossRefGoogle Scholar
Comisso, L., Grasso, D. & Waelbroeck, F. L. 2015 Extended theory of the Taylor problem in the plasmoid-unstable regime. Phys. Plasmas 22, 042109.Google Scholar
Comisso, L., Lingam, M., Huang, Y.-M. & Bhattacharjee, A. 2016 General theory of the plasmoid instability. Phys. Plasmas 23, 100702.Google Scholar
Felici, F., Goodman, T. P., Sauter, O., Cnala, G., Coda, S., Duval, B. P., Rossel, J. X.& TCV Team 2012 Integrated real-time control of MHD instabilities using multi-beam ECRH/ECCD systems on TCV. Nucl. Fusion 52, 074001.Google Scholar
Fevrier, O., Maget, P., Lutjens, H. et al. 2016 First principles fluid modelling of magnetic island stabilization by electron cyclotron current drive (ECCD). Plasma Phys. Control. Fusion 58, 045015.Google Scholar
Fevrier, O., Maget, P., Lutjens, H. & Beyer, P. 2017 Comparison of magnetic island stabilization strategies from magneto-hydrodynamic simulations. Plasma Phys. Control. Fusion 59, 044002.Google Scholar
Fisch, N. J. & Boozer, A. H. 1980 Creating an asymmetric plasma resistivity with waves. Phys. Rev. Lett. 45, 720.Google Scholar
Furth, H. P., Killeen, J. & Rosenbluth, M. N. 1963 Finite resistivity instabilities of a sheet pinch. Phys. Fluids 6, 459.Google Scholar
Hahm, T. S. & Kulsrud, R. M. 1985 Forced magnetic reconnetcion. Phys. Fluids 28, 2412.Google Scholar
Hegna, C. C. & Callen, J. D. 1997 On the stabilization of neoclassical magnetohydrodynamic tearing modes using localized current drive or heating. Phys. Plasmas 4, 2940.Google Scholar
Koleman, E., Welander, A. S., La Haye, R. J., Eidities, N. W., Humphreys, D. A., Lohr, J., Noraky, V., Penaflor, B. G., Prater, R. & Turco, F. 2014 State-of-the-art neoclassical tearing mode control in DIII-D using real-time steerable electron cyclotron current drive launchers. Nucl. Fusion 54, 073020.Google Scholar
Lazzaro, E., Borgogno, D., Brunetti, D., Comisso, L. et al. 2018 Physics conditions for robust control of tearing modes in a rotating tokamak plasma. Plasma Phys. Control. Fusion 60, 014044.CrossRefGoogle Scholar
Lazzaro, E. & Coelho, R. 2002 Generic structure of externally driven tearing modes instabilities. Eur. Phys. J. D 19, 97.Google Scholar
Lazzaro, E. & Comisso, L. 2011 Magnetic reconnection controlled by external current drive. Plasma Phys. Control. Fusion 53, 054012.Google Scholar
Maraschek, M. 2012 Control of neoclassical tearing modes. Nucl. Fusion 52, 074007.Google Scholar
Militello, F., Grasso, D. & Borgogno, D. 2014 The deceiving $\unicode[STIX]{x1D6E5}^{\prime }$ : On the equilibrium dependent dynamics of nonlinear magnetic islands. Phys. Plasmas 21, 102514.Google Scholar
Monticello, D. A., White, R. & Rosenbluth, M. N. 1978 Proceedings of the 7th IAEA International Conference, Tokyo, Paper No. IAEA-CN-37/K- 3, Plasma Phys. Controlled Nucl. Fusion Res., vol. 1, p. 605.Google Scholar
Park, M., Na, Y.-S., Seo, J., Kim, M. & Kim, K. 2018 Effect of electron cyclotron beam width to neoclassical tearing mode stabilization by minimum seeking control in ITER. Nucl. Fusion 58, 016042.CrossRefGoogle Scholar
Park, W., Monticello, D. A. & White, R. B. 1984 Reconnection rates of magnetic fields including the effects of viscosity. Phys. Fluids 27, 137.Google Scholar
Perkins, F. W., Harvey, R. W., Makowski, M. & Rosenbluth, M. N. 1997 Prospects for electron cyclotron current drive stabilization of neoclassical tearing modes in ITER. In 17th IEEE/NPSS Symposium Fusion Engineering (Cat. No.97CH36131) San Diego, CA, vol. 2, pp. 749–751.Google Scholar
Rapson, C. J., Fischer, R., Giannone, L., Maraschek, M., Reich, M., Treutterer, W.& The ASDEX Upgrade Team 2017 Improved localisation of neoclassical tearing modes by combining multiple diagnostic estimates. Nucl. Fusion 57, 076023.Google Scholar
Reiman, A. H. 1983 Suppression of magnetic islands by rf driven currents. Phys. Fluids 26, 1338.Google Scholar
Rutherford, P. H. 1973 Nonlinear growth of the tearing mode. Phys. Fluids 16, 1903.Google Scholar
Strauss, H. R. 1976 Nonlinear, three dimensional magnetohydrodynamics of noncircular tokamaks. Phys. Fluids 19, 134.Google Scholar
Wang, S., Ma, Z. W. & Zhang, W. 2016 Influence of driven current on resistive tearing mode in Tokamaks. Phys. Plasmas 23, 052503.Google Scholar
Welander, A. S., Kolemen, E., La Haye, R. J., Eidietis, N. W., Humphreys, D. A., Lohr, J., Noraky, S., Penaflor, B. G., Prater, R. & Turco, F. 2013 Advanced control of neoclassical tearing modes in DIII-D with real-time steering of the electron cyclotron current drive. Nucl. Fusion 55, 124033.Google Scholar
White, R. B. 1986 Resistive Reconnection. Rev. Mod. Phys. 58, 183.Google Scholar