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Noterdaeme JM, Eriksson LG, Mantsinen M, Mayoral ML, Eester DV, Mailloux J, Gormezano C, Jones TTC. Chapter 9: Physics Studies with the Additional Heating Systems in JET. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst08-a1749] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- J.-M. Noterdaeme
- Max-Planck-Institut für Plasmaphysik, Euratom-Association IPP, D-85740 Garching, Germany
- University of Gent, Electrical Energy, Systems, and Automation Department, Gent, Belgium
| | - L.-G. Eriksson
- Association Euratom-CEA, CEA/DSM/DRFC Centre de Cadarache, 13108 St. Paul lez Durance, France
| | - M. Mantsinen
- Helsinki University of Technology, EURATOM-Association TEKES, Helsinki, Finland
| | - M.-L. Mayoral
- Euratom/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
| | - D. Van Eester
- Laboratory for Plasmas Physics, Association “EURATOM – Belgian State,” ERM-KMS, Trilateral Euregio Cluster Brussels, Belgium
| | - J. Mailloux
- Euratom/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
| | | | - T. T. C. Jones
- Euratom/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
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Mantica P, Corrigan G, Garbet X, Imbeaux F, Lonnroth J, Parail V, Tala T, Taroni A, Valisa M, Weisen H. Chapter 10: Core Transport Studies in JET. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst08-a1750] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- P. Mantica
- Istituto di Fisica del Plasma, Euratom/ENEA-CNR Association, Via Cozzi 53, 20125 Milano, Italy
| | - G. Corrigan
- Culham Science Centre, EURATOM/UKAEA Fusion Association, Abingdon OX14 3DB, United Kingdom
| | - X. Garbet
- Association EURATOM-CEA, CEA Cadarache, 13108 St Paul-Lez-Durance, France
| | - F. Imbeaux
- Association EURATOM-CEA, CEA Cadarache, 13108 St Paul-Lez-Durance, France
| | - J. Lonnroth
- Association EURATOM-Tekes, Helsinki University of Technology, P.O. Box 2200, 02015 HUT, Finland
| | - V. Parail
- Culham Science Centre, EURATOM/UKAEA Fusion Association, Abingdon OX14 3DB, United Kingdom
| | - T. Tala
- Association EURATOM-TEKES, VTT, P.O. Box 1000, FIN-02044 VTT, Finland
| | - A. Taroni
- Former Member of the JET Joint Undertaking
| | - M. Valisa
- Consorzio RFX-Associazione Euratom-Enea sulla Fusione, I-35127 Padova, Italy
| | - H. Weisen
- EPFL, CRPP, Association EURATOM—Confederation Suisse, 1015 Lausanne, Switzerland
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Mantica P, Angioni C, Challis C, Colyer G, Frassinetti L, Hawkes N, Johnson T, Tsalas M, deVries PC, Weiland J, Baiocchi B, Beurskens MNA, Figueiredo ACA, Giroud C, Hobirk J, Joffrin E, Lerche E, Naulin V, Peeters AG, Salmi A, Sozzi C, Strintzi D, Staebler G, Tala T, Van Eester D, Versloot T. A key to improved ion core confinement in the JET tokamak: ion stiffness mitigation due to combined plasma rotation and low magnetic shear. PHYSICAL REVIEW LETTERS 2011; 107:135004. [PMID: 22026864 DOI: 10.1103/physrevlett.107.135004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2011] [Indexed: 05/31/2023]
Abstract
New transport experiments on JET indicate that ion stiffness mitigation in the core of a rotating plasma, as described by Mantica et al. [Phys. Rev. Lett. 102, 175002 (2009)] results from the combined effect of high rotational shear and low magnetic shear. The observations have important implications for the understanding of improved ion core confinement in advanced tokamak scenarios. Simulations using quasilinear fluid and gyrofluid models show features of stiffness mitigation, while nonlinear gyrokinetic simulations do not. The JET experiments indicate that advanced tokamak scenarios in future devices will require sufficient rotational shear and the capability of q profile manipulation.
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Affiliation(s)
- P Mantica
- Istituto di Fisica del Plasma "P. Caldirola," Associazione Euratom-ENEA-CNR, Milano, Italy
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Xiao WW, Zou XL, Ding XT, Yao LH, Feng BB, Song XM, Song SD, Zhou Y, Liu ZT, Yuan BS, Sun HJ, Ji XQ, Gao YD, Li YG, Yan LW, Yang QW, Liu Y, Dong JQ, Duan XR, Liu Y, Pan CH. Observation of a spontaneous particle-transport barrier in the HL-2A tokamak. PHYSICAL REVIEW LETTERS 2010; 104:215001. [PMID: 20867107 DOI: 10.1103/physrevlett.104.215001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2008] [Indexed: 05/29/2023]
Abstract
Using the profile analysis, the density perturbation transport analysis, and the Doppler reflectometry measurement, for the first time a spontaneous and steady-state particle-transport barrier has been evidenced in the Ohmic plasmas in the HL-2A tokamak with no externally applied momentum or particle input except the gas puffing. A threshold in density has been found for the observation of the barrier. The particle diffusivity is well-like, and the convection is found to be inward outside the well and outward inside the well. The formation of the barrier coincides with the transition between the trapped electron mode and the ion temperature gradient driven mode.
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Affiliation(s)
- W W Xiao
- Southwestern Institute of Physics, P.O. Box 432, Chengdu, China
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Pace DC, Shi M, Maggs JE, Morales GJ, Carter TA. Spontaneous thermal waves in a magnetized plasma. PHYSICAL REVIEW LETTERS 2008; 101:035003. [PMID: 18764260 DOI: 10.1103/physrevlett.101.035003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2008] [Indexed: 05/26/2023]
Abstract
Coherent temperature oscillations corresponding to thermal (diffusion) waves are observed to be spontaneously excited in a narrow temperature filament embedded in a large, but colder, magnetized plasma. The parallel and transverse propagation properties of the waves satisfy the predictions of the classical transport theory based on Coulomb collisions. The frequency of the oscillations meets the conditions for a quarter-wave thermal resonator. This is the plasma version of thermal resonators used in the study of other states of matter.
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Affiliation(s)
- D C Pace
- Department of Physics and Astronomy, University of California, Los Angeles, Los Angeles, California 90095, USA.
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García J, Giruzzi G, Artaud JF, Basiuk V, Decker J, Imbeaux F, Peysson Y, Schneider M. Critical threshold behavior for steady-state internal transport barriers in burning plasmas. PHYSICAL REVIEW LETTERS 2008; 100:255004. [PMID: 18643670 DOI: 10.1103/physrevlett.100.255004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2008] [Indexed: 05/26/2023]
Abstract
Burning tokamak plasmas with internal transport barriers are investigated by means of integrated modeling simulations. The barrier sustainment in steady state, differently from the barrier formation process, is found to be characterized by a critical behavior, and the critical number of the phase transition is determined. Beyond a power threshold, alignment of self-generated and noninductively driven currents occurs and steady state becomes possible. This concept is applied to simulate a steady-state scenario within the specifications of the International Thermonuclear Experimental Reactor.
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Affiliation(s)
- J García
- Association EURATOM-CEA, CEA/DSM/IRFM, Cadarache, F-13108 St. Paul lez Durance, France
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Pedrosa MA, Silva C, Hidalgo C, Carreras BA, Orozco RO, Carralero D. Evidence of long-distance correlation of fluctuations during edge transitions to improved-confinement regimes in the TJ-II stellarator. PHYSICAL REVIEW LETTERS 2008; 100:215003. [PMID: 18518613 DOI: 10.1103/physrevlett.100.215003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2008] [Indexed: 05/26/2023]
Abstract
Long-distance coupling between edge parameters' fluctuations has been investigated in the TJ-II stellarator. Results show long-range correlations in potential fluctuations, which are amplified by the development of radial electric fields during transitions to improved-confinement regimes, whereas there is no correlation between ion saturation current signals. These experimental findings suggest the importance of long-range correlations as a new fingerprint of the plasma behavior during the development of edge shear flows and the key role of electric fields to amplify them.
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Affiliation(s)
- M A Pedrosa
- Laboratorio Nacional de Fusión, Asociación EURATOM-CIEMAT, 28040-Madrid, Spain
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