1
|
Hoang GT. Key Role of the Current Density Profile on Core Confinement and Transport in Tore Supra Plasmas: Electron Heat and Particle Transport. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst09-a9185] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- G. T. Hoang
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| |
Collapse
|
2
|
Giruzzi G, Bourdelle C, Hoang GT, Imbeaux F, Litaudon X, Maget P, Peysson Y. Physics of Discharges with Vanishing Loop Voltage. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst09-a9184] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- G. Giruzzi
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | - C. Bourdelle
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | - G. T. Hoang
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | - F. Imbeaux
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | - X. Litaudon
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | - P. Maget
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | - Y. Peysson
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| |
Collapse
|
3
|
Esposito B, Buratti P, Cirant S, Leigheb M, Bracco G, Carraro L, Cocilovo V, Gabellieri L, Gandini F, Giovannozzi E, Gormezano C, Jacchia A, Lazzaro E, Luca FD, Marinucci M, Minardi E, Nowak S, Pacella D, Panaccione L, Romanelli M, Sozzi C, Tudisco O. Chapter 6: Transport Studies in the FTU. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst04-a520] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- B. Esposito
- Associazione EURATOM-ENEA sulla Fusione, CR Frascati, Roma, Italy
| | - P. Buratti
- Associazione EURATOM-ENEA sulla Fusione, CR Frascati, Roma, Italy
| | - S. Cirant
- Associazione EURATOM-ENEA-CNR sulla Fusione, Istituto di Fisica del Plasma, Milano, Italy
| | - M. Leigheb
- Associazione EURATOM-ENEA sulla Fusione, CR Frascati, Roma, Italy
| | - G. Bracco
- Associazione EURATOM-ENEA sulla Fusione, CR Frascati, Roma, Italy
| | - L. Carraro
- Associazione EURATOM-ENEA-CNR sulla Fusione, Consorzio RFX, Corso Stati Uniti 4 1-35100, Padova, Italy
| | - V. Cocilovo
- Associazione EURATOM-ENEA sulla Fusione, CR Frascati, Roma, Italy
| | - L. Gabellieri
- Associazione EURATOM-ENEA sulla Fusione, CR Frascati, Roma, Italy
| | - F. Gandini
- Associazione EURATOM-ENEA-CNR sulla Fusione, Istituto di Fisica del Plasma, Milano, Italy
| | - E. Giovannozzi
- Associazione EURATOM-ENEA sulla Fusione, CR Frascati, Roma, Italy
| | - C. Gormezano
- Associazione EURATOM-ENEA sulla Fusione, CR Frascati, Roma, Italy
| | - A. Jacchia
- Associazione EURATOM-ENEA-CNR sulla Fusione, Istituto di Fisica del Plasma, Milano, Italy
| | - E. Lazzaro
- Associazione EURATOM-ENEA-CNR sulla Fusione, Istituto di Fisica del Plasma, Milano, Italy
| | - F. de Luca
- Associazione EURATOM-ENEA-CNR sulla Fusione, Istituto di Fisica del Plasma, Milano, Italy
| | - M. Marinucci
- Associazione EURATOM-ENEA sulla Fusione, CR Frascati, Roma, Italy
| | - E. Minardi
- Associazione EURATOM-ENEA-CNR sulla Fusione, Istituto di Fisica del Plasma, Milano, Italy
| | - S. Nowak
- Associazione EURATOM-ENEA-CNR sulla Fusione, Istituto di Fisica del Plasma, Milano, Italy
| | - D. Pacella
- Associazione EURATOM-ENEA sulla Fusione, CR Frascati, Roma, Italy
| | - L. Panaccione
- Associazione EURATOM-ENEA sulla Fusione, CR Frascati, Roma, Italy
| | - M. Romanelli
- Associazione EURATOM-ENEA sulla Fusione, CR Frascati, Roma, Italy
| | - C Sozzi
- Associazione EURATOM-ENEA-CNR sulla Fusione, Istituto di Fisica del Plasma, Milano, Italy
| | - O. Tudisco
- Associazione EURATOM-ENEA sulla Fusione, CR Frascati, Roma, Italy
| |
Collapse
|
4
|
Gormezano C, Buratti P, Apicella ML, Barbato E, Bracco G, Cardinali A, Castaldo C, Cesario R, Cirant S, Crisanti F, Benedetti MD, Esposito B, Frigione D, Gabellieri L, Giovannozzi E, Granucci G, Kroegler H, Leigheb M, Marinucci M, Pacella D, Panaccione L, Pericoli-Ridolfini P, Pieroni L, Podda S, Romanelli F, Romanelli M, Smeulders P, Sozzi C, Tuccillo AA, Tudisco O. Chapter 2: Highlights of the Physics Studies in the FTU. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst04-a516] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- C. Gormezano
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | - P. Buratti
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | - M. L. Apicella
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | - E. Barbato
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | - G. Bracco
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | - A. Cardinali
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | - C. Castaldo
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | - R. Cesario
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | - S. Cirant
- Associazione EURATOM-ENEA-CNR sulla Fusione, Istituto di Fisica del Plasma Milano, Italy
| | - F. Crisanti
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | - M. de Benedetti
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | - B. Esposito
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | - D. Frigione
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | - L. Gabellieri
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | - E. Giovannozzi
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | - G. Granucci
- Associazione EURATOM-ENEA-CNR sulla Fusione, Istituto di Fisica del Plasma Milano, Italy
| | - H. Kroegler
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | - M. Leigheb
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | - M. Marinucci
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | - D. Pacella
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | - L. Panaccione
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | | | - L. Pieroni
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | - S. Podda
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | - F. Romanelli
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | - M. Romanelli
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | - P. Smeulders
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | - C. Sozzi
- Associazione EURATOM-ENEA-CNR sulla Fusione, Istituto di Fisica del Plasma Milano, Italy
| | - A. A. Tuccillo
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| | - O. Tudisco
- Associazione EURATOM-ENEA sulla fusione, CR Frascati, Roma, Italy
| |
Collapse
|
5
|
Houshmandyar S, Yang ZJ, Phillips PE, Rowan WL, Hubbard AE, Rice JE, Hughes JW, Wolfe SM. Temperature gradient scale length measurement: A high accuracy application of electron cyclotron emission without calibration. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:11E101. [PMID: 27910677 DOI: 10.1063/1.4955297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Calibration is a crucial procedure in electron temperature (Te) inference from a typical electron cyclotron emission (ECE) diagnostic on tokamaks. Although the calibration provides an important multiplying factor for an individual ECE channel, the parameter ΔTe/Te is independent of any calibration. Since an ECE channel measures the cyclotron emission for a particular flux surface, a non-perturbing change in toroidal magnetic field changes the view of that channel. Hence the calibration-free parameter is a measure of Te gradient. BT-jog technique is presented here which employs the parameter and the raw ECE signals for direct measurement of electron temperature gradient scale length.
Collapse
Affiliation(s)
- S Houshmandyar
- Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, USA
| | - Z J Yang
- Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - P E Phillips
- Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, USA
| | - W L Rowan
- Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, USA
| | - A E Hubbard
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02129, USA
| | - J E Rice
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02129, USA
| | - J W Hughes
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02129, USA
| | - S M Wolfe
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02129, USA
| |
Collapse
|
6
|
Zhong WL, Shen Y, Zou XL, Gao JM, Shi ZB, Dong JQ, Duan XR, Xu M, Cui ZY, Li YG, Ji XQ, Yu DL, Cheng J, Xiao GL, Jiang M, Yang ZC, Zhang BY, Shi PW, Liu ZT, Song XM, Ding XT, Liu Y. Observation of Double Impurity Critical Gradients for Electromagnetic Turbulence Excitation in Tokamak Plasmas. PHYSICAL REVIEW LETTERS 2016; 117:045001. [PMID: 27494476 DOI: 10.1103/physrevlett.117.045001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Indexed: 06/06/2023]
Abstract
The impact of impurity ions on a pedestal has been investigated in the HL-2A Tokamak, at the Southwestern Institute of Physics, Chengdu, China. Experimental results have clearly shown that during the H-mode phase, an electromagnetic turbulence was excited in the edge plasma region, where the impurity ions exhibited a peaked profile. It has been found that double impurity critical gradients are responsible for triggering the turbulence. Strong stiffness of the impurity profile has been observed during cyclic transitions between the I-phase and H-mode regime. The results suggest that the underlying physics of the self-regulated edge impurity profile offers the possibility for an active control of the pedestal dynamics via pedestal turbulence.
Collapse
Affiliation(s)
- W L Zhong
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China
| | - Y Shen
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China
| | - X L Zou
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | - J M Gao
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China
| | - Z B Shi
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China
| | - J Q Dong
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China
- Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027, People's Republic of China
| | - X R Duan
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China
| | - M Xu
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China
| | - Z Y Cui
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China
| | - Y G Li
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China
| | - X Q Ji
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China
| | - D L Yu
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China
| | - J Cheng
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China
| | - G L Xiao
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China
| | - M Jiang
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China
| | - Z C Yang
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China
| | - B Y Zhang
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China
| | - P W Shi
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China
| | - Z T Liu
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China
| | - X M Song
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China
| | - X T Ding
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China
| | - Yong Liu
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China
| |
Collapse
|
7
|
Zhong WL, Zou XL, Bourdelle C, Song SD, Artaud JF, Aniel T, Duan XR. Convective velocity reversal caused by turbulence transition in tokamak plasma. PHYSICAL REVIEW LETTERS 2013; 111:265001. [PMID: 24483800 DOI: 10.1103/physrevlett.111.265001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2013] [Indexed: 06/03/2023]
Abstract
Particle transport has been studied in the Tore Supra tokamak by using modulated ion cyclotron resonance heating to generate perturbations of density and temperature. For the first time, a reversal of the particle convective velocity and a strong increase in the turbulent particle flux have been clearly observed. When the mixed critical gradient ζc=R/L(T)+4(R/L(n))=22 is exceeded, the particle flux increases sharply and the convective velocity reverses from inward to outward. These observations are in agreement with quasilinear, gyrokinetic calculations. The critical gradient corresponds to a transition from an instability driven by the ion temperature gradient to the onset of another instability caused by trapped electrons.
Collapse
Affiliation(s)
- W L Zhong
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China
| | - X L Zou
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | - C Bourdelle
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | - S D Song
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China
| | - J F Artaud
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | - T Aniel
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | - X R Duan
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People's Republic of China
| |
Collapse
|
8
|
Hillesheim JC, DeBoo JC, Peebles WA, Carter TA, Wang G, Rhodes TL, Schmitz L, McKee GR, Yan Z, Staebler GM, Burrell KH, Doyle EJ, Holland C, Petty CC, Smith SP, White AE, Zeng L. Observation of a critical gradient threshold for electron temperature fluctuations in the DIII-D Tokamak. PHYSICAL REVIEW LETTERS 2013; 110:045003. [PMID: 25166172 DOI: 10.1103/physrevlett.110.045003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2012] [Indexed: 06/03/2023]
Abstract
A critical gradient threshold has been observed for the first time in a systematic, controlled experiment for a locally measured turbulent quantity in the core of a confined high-temperature plasma. In an experiment in the DIII-D tokamak where L(T(e))(-1) = |∇T(e)|/T(e) and toroidal rotation were varied, long wavelength (k(θ)ρ(s) ≲ 0.4) electron temperature fluctuations exhibit a threshold in L(T(e))(-1): below, they change little; above, they steadily increase. The increase in δT(e)/T(e) is concurrent with increased electron heat flux and transport stiffness. Observations were insensitive to rotation. Accumulated evidence strongly enforces the identification of the experimentally observed threshold with ∇T(e)-driven trapped electron mode turbulence.
Collapse
Affiliation(s)
- J C Hillesheim
- Department of Physics and Astronomy, University of California at Los Angeles, Los Angeles, California 90024-1547, USA
| | - J C DeBoo
- General Atomics, San Diego, California 92186-5608, USA
| | - W A Peebles
- Department of Physics and Astronomy, University of California at Los Angeles, Los Angeles, California 90024-1547, USA
| | - T A Carter
- Department of Physics and Astronomy, University of California at Los Angeles, Los Angeles, California 90024-1547, USA
| | - G Wang
- Department of Physics and Astronomy, University of California at Los Angeles, Los Angeles, California 90024-1547, USA
| | - T L Rhodes
- Department of Physics and Astronomy, University of California at Los Angeles, Los Angeles, California 90024-1547, USA
| | - L Schmitz
- Department of Physics and Astronomy, University of California at Los Angeles, Los Angeles, California 90024-1547, USA
| | - G R McKee
- University of Wisconsin Madison, Madison, Wisconsin 53706-1687, USA
| | - Z Yan
- University of Wisconsin Madison, Madison, Wisconsin 53706-1687, USA
| | - G M Staebler
- General Atomics, San Diego, California 92186-5608, USA
| | - K H Burrell
- General Atomics, San Diego, California 92186-5608, USA
| | - E J Doyle
- Department of Physics and Astronomy, University of California at Los Angeles, Los Angeles, California 90024-1547, USA
| | - C Holland
- University of California at San Diego, La Jolla, California 92093-0417, USA
| | - C C Petty
- General Atomics, San Diego, California 92186-5608, USA
| | - S P Smith
- General Atomics, San Diego, California 92186-5608, USA
| | - A E White
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - L Zeng
- Department of Physics and Astronomy, University of California at Los Angeles, Los Angeles, California 90024-1547, USA
| |
Collapse
|
9
|
Villegas D, Guirlet R, Bourdelle C, Hoang GT, Garbet X, Sabot R. Experimental electron temperature gradient dependence of heavy impurity transport in fusion devices. PHYSICAL REVIEW LETTERS 2010; 105:035002. [PMID: 20867773 DOI: 10.1103/physrevlett.105.035002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2010] [Indexed: 05/29/2023]
Abstract
The turbulent impurity (nickel) transport dependence on the normalized electron temperature gradient has been analyzed in sawtooth-free electron cyclotron wave heated Tore Supra plasmas. In the core, our experimental analysis shows that the lower R/L((T)(e)), the lower the nickel diffusion coefficient. The latter decreases until the instability threshold is reached. The experimental threshold is in agreement with the one computed by a gyrokinetic model. Further out, R/L((T)(e)) plays no role in the impurity diffusion. This set of experimental results is consistent with a quasilinear gyrokinetic analysis.
Collapse
Affiliation(s)
- D Villegas
- CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
| | | | | | | | | | | |
Collapse
|
10
|
Wolf RC. A Tokamak Reactor Based on Advanced Concepts. FUSION SCIENCE AND TECHNOLOGY 2006. [DOI: 10.13182/fst06-a1143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- R. C. Wolf
- Institut f¨ur Plasmaphysik, Forschungszentrum J¨ulich, EURATOM Assocation/FZJ, Trilateral Euregio Cluster, D-52425 J¨ulich, Germany
| |
Collapse
|
11
|
Ryter F, Angioni C, Peeters AG, Leuterer F, Fahrbach HU, Suttrop W. Experimental study of trapped-electron-mode properties in tokamaks: threshold and stabilization by collisions. PHYSICAL REVIEW LETTERS 2005; 95:085001. [PMID: 16196865 DOI: 10.1103/physrevlett.95.085001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2005] [Indexed: 05/04/2023]
Abstract
Trapped electron modes are one of the candidates to explain turbulence driven electron heat transport observed in tokamaks. This instability has two characteristics: a threshold in normalized gradient and stabilization by collisions. Experiments using modulated electron cyclotron heating in the ASDEX Upgrade tokamak demonstrate explicitly the existence of the threshold. The stabilization with increasing collisionality is evidenced by a strong decrease of the propagation of heat pulses, explained by a transition to ion temperature gradient driven transport. These results are supported by linear gyrokinetic calculations.
Collapse
Affiliation(s)
- F Ryter
- Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-85748 Garching, Germany
| | | | | | | | | | | |
Collapse
|
12
|
Hoang GT, Bourdelle C, Garbet X, Artaud JF, Basiuk V, Bucalossi J, Clairet F, Fenzi-Bonizec C, Gil C, Ségui JL, Travère JM, Tsitrone E, Vermare L. Parametric dependence of turbulent particle transport in tore supra plasmas. PHYSICAL REVIEW LETTERS 2004; 93:135003. [PMID: 15524729 DOI: 10.1103/physrevlett.93.135003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2004] [Indexed: 05/24/2023]
Abstract
Steady state full noninductive current tore supra plasmas offer a unique opportunity to study the local parametric dependence of particle pinch velocity, in order to discriminate among different theories. Magnetic field shear is found to generate an inward pinch which is dominant in the gradient region (normalized radius 0.3</=r/a</=0.6). In contrast, the direction of the pinch in the plasma core (r/a</=0.3) is correlated with the electron temperature gradient length. The results are in agreement with both the turbulent theoretical and computational predictions.
Collapse
Affiliation(s)
- G T Hoang
- Euratom-CEA Association, CEA/DSM/DRFC, CEA Cadarache F-13108, Saint-Paul-Lez-Durance, France
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Davis W, Mastrovito D. DbAccess: interactive statistics and graphics for plasma physics databases. FUSION ENGINEERING AND DESIGN 2004. [DOI: 10.1016/j.fusengdes.2004.04.031] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
14
|
Wolf RC. A Tokamak Reactor Based on Advanced Concepts. FUSION SCIENCE AND TECHNOLOGY 2004. [DOI: 10.13182/fst04-a514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- R. C. Wolf
- Institut für Plasmaphysik, Forschungszentrum Jülich, EURATOM Assocation/FZJ, Trilateral Euregio Cluster, D-52425 Jülich, Germany
| |
Collapse
|
15
|
Ida K, Shimozuma T, Funaba H, Narihara K, Kubo S, Murakami S, Wakasa A, Yokoyama M, Takeiri Y, Watanabe KY, Tanaka K, Yoshinuma M, Liang Y, Ohyabu N. Characteristics of electron heat transport of plasma with an electron internal-transport barrier in the large helical device. PHYSICAL REVIEW LETTERS 2003; 91:085003. [PMID: 14525247 DOI: 10.1103/physrevlett.91.085003] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2003] [Indexed: 05/24/2023]
Abstract
Associated with the transition from ion root to electron root, an electron internal transport barrier (ITB) appears in the large helical device, when the heating power of electron cyclotron resonance heating exceeds the threshold power. The incremental thermal diffusivity of electron heat transport chi(inc)(e) in the ITB plasma is much lower than that in the plasma with the heating power below the threshold, and the thermal diffusivity chi(e) decreases with increasing of heating power [dchi(e)/d(P/n(e))<0] in helical ITB plasmas.
Collapse
Affiliation(s)
- K Ida
- National Institute for Fusion Sciences, Toki, Gifu 509-5292, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Tangri V, Das A, Kaw P, Singh R. Continuum self-organized-criticality model of turbulent heat transport in tokamaks. PHYSICAL REVIEW LETTERS 2003; 91:025001. [PMID: 12906484 DOI: 10.1103/physrevlett.91.025001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2002] [Indexed: 05/24/2023]
Abstract
A simple generic one-dimensional continuum model of driven dissipative systems is proposed to explain self-organized bursty heat transport in tokamaks. Extensive numerical simulations of this model reproduce many features of present day tokamaks such as submarginal temperature profiles, intermittent transport events, 1/f scaling of the frequency spectra, propagating fronts, etc. This model utilizes a minimal set of phenomenological parameters, which may be determined from experiments and/or simulations. Analytical and physical understanding of the observed features has also been attempted.
Collapse
Affiliation(s)
- Varun Tangri
- Institute for Plasma Research, Bhat, Gandhinagar 382428, India
| | | | | | | |
Collapse
|
17
|
Jenko F, Dorland W. Prediction of significant tokamak turbulence at electron gyroradius scales. PHYSICAL REVIEW LETTERS 2002; 89:225001. [PMID: 12485074 DOI: 10.1103/physrevlett.89.225001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2002] [Indexed: 05/24/2023]
Abstract
The experimental conditions under which tokamak turbulence at hyperfine (electron gyroradius) scales is predicted to be significant and observable are described. The first quantitative predictions of fluctuation amplitudes, spectral features, and the associated electron energy transport are presented. A novel theoretical model which quantitatively describes the boundaries of the high-amplitude streamer transport regime is presented and shown to explain the gyrokinetic simulation results. This model uniquely includes consideration of two distinct secondary instabilities.
Collapse
Affiliation(s)
- F Jenko
- Max-Planck-Institut für Plasmaphysik, EURATOM Association, Boltzmannstrasse 2, 85748 Garching, Germany
| | | |
Collapse
|