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Graves JP, Chapman IT, Coda S, Johnson T, Lennholm M, Paley JI, Sauter O. Recent Advances in Sawtooth Control. Fusion Science and Technology 2017. [DOI: 10.13182/fst11-a11695] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- J. P. Graves
- JET-EFDA, Culham Science Centre, OX14 3DB, Abingdon, United Kingdom
- École Polytechnique Fédérale de Lausanne (EPFL), Centre de Recherches en Physique des Plasmas Association EURATOM-Confédération Suisse, 1015 Lausanne, Switzerland
| | - I. T. Chapman
- JET-EFDA, Culham Science Centre, OX14 3DB, Abingdon, United Kingdom
- Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon, United Kingdom
| | - S. Coda
- JET-EFDA, Culham Science Centre, OX14 3DB, Abingdon, United Kingdom
- École Polytechnique Fédérale de Lausanne (EPFL), Centre de Recherches en Physique des Plasmas Association EURATOM-Confédération Suisse, 1015 Lausanne, Switzerland
| | - T. Johnson
- JET-EFDA, Culham Science Centre, OX14 3DB, Abingdon, United Kingdom
- Euratom-VR Association, EES, KTH, Stockholm, Sweden
| | - M. Lennholm
- JET-EFDA, Culham Science Centre, OX14 3DB, Abingdon, United Kingdom
- EFDA-JET CSU, Culham Science Centre, Abingdon, OX14 3DB, United Kingdom
| | - J. I. Paley
- JET-EFDA, Culham Science Centre, OX14 3DB, Abingdon, United Kingdom
- École Polytechnique Fédérale de Lausanne (EPFL), Centre de Recherches en Physique des Plasmas Association EURATOM-Confédération Suisse, 1015 Lausanne, Switzerland
| | - O. Sauter
- JET-EFDA, Culham Science Centre, OX14 3DB, Abingdon, United Kingdom
- École Polytechnique Fédérale de Lausanne (EPFL), Centre de Recherches en Physique des Plasmas Association EURATOM-Confédération Suisse, 1015 Lausanne, Switzerland
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Lennholm M, Eriksson LG, Turco F, Bouquey F, Darbos C, Dumont R, Giruzzi G, Jung M, Lambert R, Magne R, Molina D, Moreau P, Rimini F, Segui JL, Song S, Traisnel E. Closed Loop Sawtooth Period Control Using Variable ECCD Injection Angles on Tore Supra. Fusion Science and Technology 2017. [DOI: 10.13182/fst09-a4052] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- M. Lennholm
- Association EURATOM-CEA DSM/IRFM, CEA/Cadarache, 13108 St. Paul-lez-Durance, France
| | - L-G. Eriksson
- Association EURATOM-CEA DSM/IRFM, CEA/Cadarache, 13108 St. Paul-lez-Durance, France
| | - F. Turco
- Association EURATOM-CEA DSM/IRFM, CEA/Cadarache, 13108 St. Paul-lez-Durance, France
| | - F. Bouquey
- Association EURATOM-CEA DSM/IRFM, CEA/Cadarache, 13108 St. Paul-lez-Durance, France
| | - C. Darbos
- Association EURATOM-CEA DSM/IRFM, CEA/Cadarache, 13108 St. Paul-lez-Durance, France
| | - R. Dumont
- Association EURATOM-CEA DSM/IRFM, CEA/Cadarache, 13108 St. Paul-lez-Durance, France
| | - G. Giruzzi
- Association EURATOM-CEA DSM/IRFM, CEA/Cadarache, 13108 St. Paul-lez-Durance, France
| | - M. Jung
- Association EURATOM-CEA DSM/IRFM, CEA/Cadarache, 13108 St. Paul-lez-Durance, France
| | - R. Lambert
- Association EURATOM-CEA DSM/IRFM, CEA/Cadarache, 13108 St. Paul-lez-Durance, France
| | - R. Magne
- Association EURATOM-CEA DSM/IRFM, CEA/Cadarache, 13108 St. Paul-lez-Durance, France
| | - D. Molina
- Association EURATOM-CEA DSM/IRFM, CEA/Cadarache, 13108 St. Paul-lez-Durance, France
| | - P. Moreau
- Association EURATOM-CEA DSM/IRFM, CEA/Cadarache, 13108 St. Paul-lez-Durance, France
| | - F. Rimini
- Association EURATOM-CEA DSM/IRFM, CEA/Cadarache, 13108 St. Paul-lez-Durance, France
| | - J-L. Segui
- Association EURATOM-CEA DSM/IRFM, CEA/Cadarache, 13108 St. Paul-lez-Durance, France
| | - S. Song
- Association EURATOM-CEA DSM/IRFM, CEA/Cadarache, 13108 St. Paul-lez-Durance, France
| | - E. Traisnel
- Association EURATOM-CEA DSM/IRFM, CEA/Cadarache, 13108 St. Paul-lez-Durance, France
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Zurro B, Baciero A, Jiménez-Rey D, Rodríguez-Barquero L, Crespo MT. Investigating the performance of an ion luminescence probe as a multichannel fast-ion energy spectrometer using pulse height analysis. Rev Sci Instrum 2012; 83:10D306. [PMID: 23126833 DOI: 10.1063/1.4733572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We investigate the capability of a fast-ion luminescent probe to operate as a pulse height ion energy analyzer. An existing high sensitivity system has been reconfigured as a single channel ion detector with an amplifier to give a bandwidth comparable to the phosphor response time. A digital pulse processing method has been developed to determine pulse heights from the detector signal so as to obtain time-resolved information on the ion energy distribution of the plasma ions lost to the wall of the TJ-II stellarator. Finally, the potential of this approach for magnetic confined fusion plasmas is evaluated by studying representative TJ-II discharges.
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Affiliation(s)
- B Zurro
- Laboratorio Nacional de Fusión, Asociación Euratom-CIEMAT, Madrid, Spain.
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Lennholm M, Eriksson LG, Turco F, Bouquey F, Darbos C, Dumont R, Giruzzi G, Jung M, Lambert R, Magne R, Molina D, Moreau P, Rimini F, Segui JL, Song S, Traisnel E. Demonstration of effective control of fast-ion-stabilized sawteeth by electron-cyclotron current drive. Phys Rev Lett 2009; 102:115004. [PMID: 19392209 DOI: 10.1103/physrevlett.102.115004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2008] [Indexed: 05/27/2023]
Abstract
In a tokamak plasma, sawtooth oscillations in the central temperature, caused by a magnetohydrodynamic instability, can be partially stabilized by fast ions. The resulting less frequent sawtooth crashes can trigger unwanted magnetohydrodynamic activity. This Letter reports on experiments showing that modest electron-cyclotron current drive power, with the deposition positioned by feedback control of the injection angle, can reliably shorten the sawtooth period in the presence of ions with energies >or=0.5 MeV. Certain surprising elements of the results are evaluated qualitatively in terms of existing theory.
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Affiliation(s)
- M Lennholm
- Association EURATOM-CEA, DSM/IRFM, CEA/Cadarache, 13108 St. Paul-lez-Durance, France
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Eriksson LG, Mueck A, Sauter O, Coda S, Mantsinen MJ, Mayoral ML, Westerhof E, Buttery RJ, McDonald D, Johnson T, Noterdaeme JM, De Vries P. Destabilization of fast-ion-induced long sawteeth by localized current drive in the JET tokamak. Phys Rev Lett 2004; 92:235004. [PMID: 15245165 DOI: 10.1103/physrevlett.92.235004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2003] [Indexed: 05/24/2023]
Abstract
In a tokamak fusion reactor the energetic alpha particles will transiently stabilize the magnetohydrodynamic activity causing sawtooth oscillations. The crash events terminating long sawtooth free periods can provide seed islands for neoclassical tearing modes [Phys. Rev. Lett. 88, 105001 (2002)]]. To shorten the sawtooth periods localized current drive near the q=1 surface is a possibility. This Letter provides the first experimental evidence for the effectiveness of this method in the different physics regime associated with fast-ion-induced long sawteeth on the JET tokamak.
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Affiliation(s)
- L-G Eriksson
- Association EURATOM-CEA, CEA/DSM/DRFC, CEA-Cadarache, F-13108 St. Paul lez Durance, France
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Graves JP, Hopcraft KI, Dendy RO, Hastie RJ, McClements KG, Mantsinen M. Sawtooth evolution during JET ion-cyclotron-resonance-heated pulses. Phys Rev Lett 2000; 84:1204-1207. [PMID: 11017479 DOI: 10.1103/physrevlett.84.1204] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/1999] [Indexed: 05/23/2023]
Abstract
The recent Joint European Torus deuterium-tritium campaign has yielded ion-cyclotron-resonance-heated (ICRH) pulses during which both the sawtooth characteristics and the ICRH minority ion population both evolve substantially. At multiple times during each pulse, the evolution of the kinetic-fluid MHD energy is calculated from measurement of the energetic ions and compared with the evolving sawtooth duration. There is strong correlation between sawtooth duration and minority ion stabilization of the ideal internal kink.
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Affiliation(s)
- JP Graves
- School of Mathematical Sciences, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
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Hatakeyama R, Sato N. Test-particle drifts in traveling waves with cyclotron frequencies. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 1995; 52:6664-6670. [PMID: 9964182 DOI: 10.1103/physreve.52.6664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Levinton FM, Zakharov L, Batha SH, Manickam J, Zarnstorff MC. Stabilization and onset of sawteeth in TFTR. Phys Rev Lett 1994; 72:2895-2898. [PMID: 10056012 DOI: 10.1103/physrevlett.72.2895] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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