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Plasma turbulence, suprathermal ion dynamics and code validation on the basic plasma physics device TORPEX

Part of: Experiments Fundamental Plasma Physics

Published online by Cambridge University Press:  13 March 2015

I. Furno ,
F. Avino ,
A. Bovet ,
A. Diallo ,
A. Fasoli ,
K. Gustafson ,
D. Iraji ,
B. Labit ,
J. Loizu  and
S. H. Müller
...Show all authors
I. Furno*
Affiliation:
Centre de Recherches en Physique des Plasmas - Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
F. Avino
Affiliation:
Centre de Recherches en Physique des Plasmas - Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
A. Bovet
Affiliation:
Centre de Recherches en Physique des Plasmas - Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
A. Diallo
Affiliation:
Princeton Plasma Physics Laboratory, Princeton, NJ 08543 - USA
K. Gustafson
Affiliation:
The Institute of Bioengineering, School of Life Sciences, Ecole Polytechnique Federale de Lausanne (EPFL), 1015 Lausanne, Switzerland
D. Iraji
Affiliation:
Istituto di Fisica del Plasma (I.F.P.). ENEA-CNR Association, Via R. Cozzi 53, 20125-Milano, Italy
B. Labit
Affiliation:
Centre de Recherches en Physique des Plasmas - Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
J. Loizu
Affiliation:
Princeton Plasma Physics Laboratory, Princeton, NJ 08543 - USA Istituto di Fisica del Plasma (I.F.P.). ENEA-CNR Association, Via R. Cozzi 53, 20125-Milano, Italy
S. H. Müller
Affiliation:
Centre de Recherches en Physique des Plasmas - Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
G. Plyushchev
Affiliation:
Centre de Recherches en Physique des Plasmas - Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
M. Podestà
Affiliation:
Princeton Plasma Physics Laboratory, Princeton, NJ 08543 - USA
F. M. Poli
Affiliation:
Princeton Plasma Physics Laboratory, Princeton, NJ 08543 - USA
P. Ricci
Affiliation:
Centre de Recherches en Physique des Plasmas - Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
C. Theiler
Affiliation:
Centre de Recherches en Physique des Plasmas - Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
*
†Email address for correspondence: [email protected]
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Abstract

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The TORPEX basic plasma physics device at the Center for Plasma Physics Research (CRPP) in Lausanne, Switzerland is described. In TORPEX, simple magnetized toroidal configurations, a paradigm for the tokamak scrape-off layer (SOL), as well as more complex magnetic geometries of direct relevance for fusion are produced. Plasmas of different gases are created and sustained by microwaves in the electron-cyclotron (EC) frequency range. Full diagnostic access allows for a complete characterization of plasma fluctuations and wave fields throughout the entire plasma volume, opening new avenues to validate numerical codes. We detail recent advances in the understanding of basic aspects of plasma turbulence, including its development from linearly unstable electrostatic modes, the formation of filamentary structures, or blobs, and its influence on the transport of energy, plasma bulk and suprathermal ions. We present a methodology for the validation of plasma turbulence codes, which focuses on quantitative assessment of the agreement between numerical simulations and TORPEX experimental data.

Type
Research Article
Information
Journal of Plasma Physics , Volume 81 , Issue 3 , June 2015 , 345810301
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Copyright
Copyright © Cambridge University Press 2015 

References

REFERENCES

Avino, F., Fasoli, A. and Furno, I. 2014 The new TORPEX in-vessel toroidal conductor for the generation of a poloidal magnetic field. Rev. Sci. Instrum. 85 (3), 2014.CrossRefGoogle ScholarPubMed
Bovet, A., Furno, I., Fasoli, A., Gustafson, K. and Ricci, P. 2012 Investigation of fast ion transport in TORPEX. Nuclear Fusion 52 (9), 094017.CrossRefGoogle Scholar
Bovet, A., Furno, I., Fasoli, A., Gustafson, K. and Ricci, P. 2013 Three-dimensional measurements of non-diffusive fast ion transport in TORPEX. Plasma Phys. Control. Fusion 55 (12), 124021.CrossRefGoogle Scholar
Bovet, A., Gamarino, M., Furno, I., Ricci, P., Fasoli, A., Gustafson, K., Newman, D. E. and Sanchez, R. 2014 Transport equation describing fractional Lévy motion of suprathermal ions in TORPEX. Nuclear Fusion 54 (10), 104009.CrossRefGoogle Scholar
Diallo, A., Fasoli, A., Furno, I., Labit, B., Podestà, M. and Theiler, C. 2008 Dynamics of plasma blobs in a shear flow. Phys. Rev. Lett. 101, 115005.CrossRefGoogle Scholar
Diallo, A., Ricci, P., Fasoli, A., Furno, I., Labit, B., Müller, S. H., Podestà, M., Poli, F. M. and Skiff, F. 2007 Antenna excitation of drift wave in a toroidal plasma. Phys. Plasmas 14 (10), 102101.CrossRefGoogle Scholar
D'Ippolito, D. A., Myra, J. R. and Zweben, S. J. 2011 Convective transport by intermittent blob-filaments: comparison of theory and experiment. Phys. Plasmas 18 (6), 060501.CrossRefGoogle Scholar
Fasoli, A.et al. 2003 Electrostatic turbulence and transport in a simple magnetized plasma. Bull. Am. Phys. Soc. 13, 119.Google Scholar
Fasoli, A.et al. 2010 Electrostatic instabilities, turbulence and fast ion interactions in the TORPEX device. Plasma Phys. Control. Fusion 52 (12), 124020.CrossRefGoogle Scholar
Fasoli, A.et al. 2013 Basic investigations of electrostatic turbulence and its interaction with plasma and suprathermal ions in a simple magnetized toroidal plasma. Nuclear Fusion 53 (6), 063013.CrossRefGoogle Scholar
Federspiel, L., Labit, B., Ricci, P., Fasoli, A., Furno, I. and Theiler, C. 2009 Observation of a critical pressure gradient for the stabilization of interchange modes in simple magnetized toroidal plasmas. Phys. Plasmas 16 (9), 092501.CrossRefGoogle Scholar
Furno, I., Diallo, A., Fasoli, A., Labit, B., Müller, S. H., Plyushchev, G., Podestà, G. and M., Poli F. 2006 Effect of the magnetic configuration on fluctuations and turbulence in a magnetized toroidal plasma. In: Proc. of 11th EU-US Transport Task Force Meeting, http://www-fusion-magnetique.cea.fr/ttf2006/, Marseille, France.Google Scholar
Furno, I.et al. 2008a Mechanism for blob generation in the TORPEX toroidal plasmaa). Phys. Plasmas 15 (5), 055903.CrossRefGoogle Scholar
Furno, I., Spolaore, M., Theiler, C., Vianello, N., Cavazzana, R. and Fasoli, A. 2011a Direct two-dimensional measurements of the field-aligned current associated with plasma blobs. Phys. Rev. Lett. 106, 245001.CrossRefGoogle ScholarPubMed
Furno, I., Theiler, C., Chabloz, V., Fasoli, A. and Loizu, J. 2014 Pre-sheath density drop induced by ion-neutral friction along plasma blobs and implications for blob velocities. Phys. Plasmas 21 (1), 012305.CrossRefGoogle Scholar
Furno, I., Theiler, C., Lançon, D., Fasoli, A., Iraji, D., Ricci, P., Spolaore, M. and Vianello, N. 2011b Blob current structures in TORPEX plasmas: experimental measurements and numerical simulations. Plasma Phys. Control. Fusion 53 (12), 124016.CrossRefGoogle Scholar
Furno, I.et al. 2008b Experimental observation of the blob-generation mechanism from interchange waves in a plasma. Phys. Rev. Lett. 100 (5), 055004.CrossRefGoogle ScholarPubMed
Garcia, O. E. 2012 Stochastic modeling of intermittent scrape-off layer plasma fluctuations. Phys. Rev. Lett. 108, 265001.CrossRefGoogle ScholarPubMed
Garcia, O. E., Naulin, V., Nielsen, A. H. and R., J. J. 2005 Turbulence and intermittent transport at the boundary of magnetized plasmas. Phys. Plasmas (1994-present) 12 (6), 062309.CrossRefGoogle Scholar
Goodman, T. P.et al. 2003 An overview of results from the TCV tokamak. Nuclear Fusion 43 (12), 1619.CrossRefGoogle Scholar
Greenwald, M. 2010 Verification and validation for magnetic fusion. Phys. Plasmas 17 (5), 058101.CrossRefGoogle Scholar
Gustafson, K. and Ricci, P. 2012 Lévy walk description of suprathermal ion transport. Phys. Plasmas 19 (3), 032304.CrossRefGoogle Scholar
Gustafson, K., Ricci, P., Bovet, A., Furno, I. and Fasoli, A. 2012a Suprathermal ion transport in simple magnetized torus configurations. Phys. Plasmas 19 (6), 062306.CrossRefGoogle Scholar
Gustafson, K., Ricci, P., Furno, I. and Fasoli, A. 2012b Nondiffusive suprathermal ion transport in simple magnetized toroidal plasmas. Phys. Rev. Lett. 108, 035006.CrossRefGoogle ScholarPubMed
Guszejnov, D., Lazanyi, N., Bencze, A. and Zoletnik, S. 2013 On the effect of intermittency of turbulence on the parabolic relation between skewness and kurtosis in magnetized plasmas. Phys. Plasmas 20 (11), 112305.CrossRefGoogle Scholar
Halpern, F. D., Ricci, P., Jolliet, S., Loizu, J. and Mosetto, A. 2014 Theory of the scrape-off layer width in inner-wall limited tokamak plasmas. Nuclear Fusion 54 (4), 043003.CrossRefGoogle Scholar
Halpern, F. D.et al. 2013 Theory-based scaling of the SOL width in circular limited tokamak plasmas. Nuclear Fusion 53 (12), 122001.CrossRefGoogle Scholar
Heidbrink, W. W.et al. 2012 Measurements of interactions between waves and energetic ions in basic plasma experiments. Plasma Phys. Control. Fusion 54 (12), 124007.CrossRefGoogle Scholar
Henderson, M. A.et al. 2003 Recent results from the electron cyclotron heated plasmas in tokamak à configuration variable (TCV). Phys. Plasmas 10 (5), 1796–1902.CrossRefGoogle Scholar
Iraji, D., Diallo, A., Fasoli, A., Furno, I. and Shibaev, S. 2008 Fast visible imaging of turbulent plasma in TORPEXa). Rev. Sci. Instrum. 79 (10), 10F508.CrossRefGoogle Scholar
Iraji, D., Furno, I. and Fasoli, A. 2011 Fast imaging of blob motion in TORPEX plasmas. IEEE Trans. Plasma Sci. 39 (11), 3010–3011.CrossRefGoogle Scholar
Iraji, D.et al. 2010 Imaging of turbulent structures and tomographic reconstruction of TORPEX plasma emissivity. Phys. Plasmas 17 (17), 122304.CrossRefGoogle Scholar
Katz, N., Egedal, J., Fox, W., Le, A. and Porkolab, M. 2008 Experiments on the propagation of plasma filaments. Phys. Rev. Lett. 101, 015003.CrossRefGoogle ScholarPubMed
Krasheninnikov, S. I. 2001 On scrape off layer plasma transport. Phys. Lett. A 283 (5–6), 368–70.CrossRefGoogle Scholar
Krommes, J. A. 2008 The remarkable similarity between the scaling of kurtosis with squared skewness for TORPEX density fluctuations and sea-surface temperature fluctuations. Phys. Plasmas 15 (3), 030703.CrossRefGoogle Scholar
Labit, B.et al. 2007a Statistical properties of electrostatic turbulence in toroidal magnetized plasmas. Plasma Phys. Control. Fusion 49 (12B), B281.CrossRefGoogle Scholar
Labit, B., Furno, I., Fasoli, A., Diallo, A., Müller, S. H., Plyushchev, G., Podestà, M. and Poli, F. M. 2007b Universal statistical properties of drift-interchange turbulence in TORPEX plasmas. Phys. Rev. Lett. 98, 255002.CrossRefGoogle ScholarPubMed
Labit, B., Theiler, C., Fasoli, A., Furno, I. and Ricci, P. 2011 Blob-induced toroidal momentum transport in simple magnetized plasmas. Phys. Plasmas 18 (3), 032308.CrossRefGoogle Scholar
Loizu, J.et al. 2013 On the electrostatic potential in the scrape-off layer of magnetic confinement devices. Plasma Phys. Control. Fusion 55 (12), 124019.CrossRefGoogle Scholar
Loizu, J., Ricci, P., Halpern, F. D., Jolliet, S. and Mosetto, A. 2014 Intrinsic toroidal rotation in the scrape-off layer of tokamaks. Phys. Plasmas 21 (6), 062309.CrossRefGoogle Scholar
Mekkaoui, A. 2013 Derivation of stochastic differential equations for scrape-off layer plasma fluctuations from experimentally measured statistics. Phys. Plasmas 20 (1), 010701.CrossRefGoogle Scholar
Mosetto, A., Halpern, F. D., Jolliet, S., Loizu, J. and Ricci, P. 2013 Turbulent regimes in the tokamak scrape-off layer. Phys. Plasmas 20 (9), 092308.CrossRefGoogle Scholar
Müller, S. 2007 Turbulence in basic toroidal plasmas. PhD thesis, SB, Lausanne.Google Scholar
Müller, S. H., Fasoli, A., Labit, B., McGrath, M., Podestà, M. and Poli, F. M. 2004 Effects of a vertical magnetic field on particle confinement in a magnetized plasma torus. Phys. Rev. Lett. 93, 165003.CrossRefGoogle Scholar
Müller, S. H., Theiler, C., Fasoli, A., Furno, I., Labit, B., Tynan, G. R., Xu, M., Yan, Z. and Yu, J. H. 2009 Studies of blob formation, propagation and transport mechanisms in basic experimental plasmas (TORPEX and CSDX). Plasma Phys. Control. Fusion 51 (5), 055020.CrossRefGoogle Scholar
Müller, S. H.et al. 2006 Probabilistic analysis of turbulent structures from two-dimensional plasma imaging. Phys. Plasmas 13 (10), 100701.CrossRefGoogle Scholar
Müller, S. H.et al. 2008 Plasma blobs in a basic toroidal experiment: origin, dynamics, and induced transport. Phys. Plasmas 14, 110704.CrossRefGoogle Scholar
Myra, J. R. and D'Ippolito, D. A. 2005 Edge instability regimes with applications to blob transport and the quasicoherent mode. Phys. Plasmas 12 (9), 092511.CrossRefGoogle Scholar
Otsuji, K.et al. 2007 Small-scale magnetic-flux emergence observed with hinode solar optical telescope. Publ. Astron. Soc. Japan 59 (sp3), S649–S654.CrossRefGoogle Scholar
Park, J., Lühr, H., Stolle, C., Rother, M., Min, K. W. and Michaelis, I. 2010 Field-aligned current associated with low-latitude plasma blobs as observed by the champ satellite. Ann. Geophys. 28 (3), 697–703.CrossRefGoogle Scholar
Perri, S. and Zimbardo, G. 2012 Superdiffusive shock acceleration. Astrophys. J. 750 (2), 87.CrossRefGoogle Scholar
Perrone, D.et al. 2013 Nonclassical transport and particle-field coupling: from laboratory plasmas to the solar wind. Space Sci. Rev. 178 (2–4), 233–270.CrossRefGoogle Scholar
Piras, F.et al. 2009 Snowflake divertor plasmas on TCV. Plasma Phys. Control. Fusion 51 (5), 055009.CrossRefGoogle Scholar
Plyushchev, G.et al. 2006 Fast ion source and detector for investigating the interaction of turbulence with suprathermal ions in a low temperature toroidal plasma. Rev. Sci. Instrum. 77 (10), 10F503.CrossRefGoogle Scholar
Podestà, M. 2007 Plasma production and transport in a simple magnetised toroidal plasma. PhD thesis, SB, Lausanne.Google Scholar
Podestà, M., Diallo, A., Fasoli, A., Furno, I., Labit, B., Müller, S. H. and Poli, F. M. 2007 Characterization of the electron distribution function in an electron-cyclotron driven toroidal plasma. Plasma Phys. Control. Fusion 49 (2), 175.CrossRefGoogle Scholar
Podestà, M., Fasoli, A., Labit, B., Furno, I., Ricci, P., Poli, F. M., Diallo, A., Müller, S. H. and Theiler, C. 2008 Cross-field transport by instabilities and blobs in a magnetized toroidal plasma. Phys. Rev. Lett. 101, 045001.CrossRefGoogle Scholar
Podestà, M., Fasoli, A., Labit, B., McGrath, M., Müller, S. H. and Poli, F. M. 2006 Experimental characterization and modelling of the particle source in an electron-cyclotron wave driven toroidal plasma. Plasma Phys. Control. Fusion 48 (8), 1053.CrossRefGoogle Scholar
Podestà, M.et al. 2005 Plasma production by low-field side injection of electron cyclotron waves in a simple magnetized torus. Plasma Phys. Control. Fusion 47 (11), 1989–2002.CrossRefGoogle Scholar
Poli, F. M., Brunner, S., Diallo, A., Fasoli, A., Furno, I., Labit, B., Müller, S. H., Plyushchev, G. and Podestà, M. 2006 Experimental characterization of drift-interchange instabilities in a simple toroidal plasma. Phys. Plasmas 13 (10), 102104.CrossRefGoogle Scholar
Poli, F. M., Podestà, M. and Fasoli, A. 2007 Development of electrostatic turbulence from drift-interchange instabilities in a toroidal plasma. Phys. Plasmas 14 (5), 052311.CrossRefGoogle Scholar
Poli, F. M., Ricci, P., Fasoli, A. and Podestà, M. 2008 Transition from drift to interchange instabilities in an open magnetic field line configuration. Phys. Plasmas 15 (3), 032104.CrossRefGoogle Scholar
Reames, D. V. 1999 Particle acceleration at the Sun and in the heliosphere. Space Sci. Rev. 90 (3–4), 413–491.CrossRefGoogle Scholar
Ricci, P., Halpern, F. D., Jolliet, S., Loizu, J., Mosetto, A., Fasoli, A., Furno, I. and Theiler, C. 2012 Simulation of plasma turbulence in scrape-off layer conditions: the gbs code, simulation results and code validation. Plasma Phys. Control. Fusion 54 (12), 124047.CrossRefGoogle Scholar
Ricci, P. and Rogers, B. N. 2009 Three-dimensional fluid simulations of a simple magnetized toroidal plasma. Phys. Plasmas 16 (9), 092307.CrossRefGoogle Scholar
Ricci, P. and Rogers, B. N. 2010 Turbulence phase space in simple magnetized toroidal plasmas. Phys. Rev. Lett. 104, 145001.CrossRefGoogle ScholarPubMed
Ricci, P. and Rogers, B. N. 2013 Plasma turbulence in the scrape-off layer of tokamak devices. Phys. Plasmas 20 (1), 010702.CrossRefGoogle Scholar
Ricci, P., Rogers, B. N. and Brunner, S. 2008 High- and low-confinement modes in simple magnetized toroidal plasmas. Phys. Rev. Lett. 100, 225002.CrossRefGoogle ScholarPubMed
Ricci, P., Theiler, C., Fasoli, A., Furno, I., Gustafson, K., Iraji, D. and Loizu, J. 2011 Methodology for turbulence code validation: quantification of simulation-experiment agreement and application to the TORPEX experiment. Phys. Plasmas 18 (3), 032109.CrossRefGoogle Scholar
Ricci, P., Theiler, C., Fasoli, A., Furno, I., Labit, B., Müller, S. H., Podestà, M. and Poli, F. M. 2009 Langmuir probe-based observables for plasma-turbulence code validation and application to the TORPEX basic plasma physics experiments. Phys. Plasmas 16 (5), 055703.CrossRefGoogle Scholar
Riva, F., Ricci, P., Halpern, F. D., Jolliet, S., Loizu, J. and Mosetto, A. 2014 Verification methodology for plasma simulations and application to a scrape-off layer turbulence code. Phys. Plasmas 21 (6), 062301.CrossRefGoogle Scholar
Ryutov, D. D. 2007 Geometrical properties of a snowflake divertor. Phys. Plasmas 14 (6), 064502.CrossRefGoogle Scholar
Sandberg, I., Benkadda, S., Garbet, X., Ropokis, G., Hizanidis, K. and del-Castillo-Negrete, D. 2012 Universal probability distribution function for bursty transport in plasma turbulence. Phys. Rev. Lett. 103, 165001.CrossRefGoogle Scholar
Schaffner, D. A., Carter, T. A., Rossi, G. D., Guice, D. S., Maggs, J. E., Vincena, S. and Friedman, B. 2012 Modification of turbulent transport with continuous variation of flow shear in the large plasma device. Phys. Rev. Lett. 109, 135002.CrossRefGoogle ScholarPubMed
Terry, P. W.et al. 2008 Validation in fusion research: towards guidelines and best practices. Phys. Plasmas 15 (6), 62503.CrossRefGoogle Scholar
Theiler, C., Diallo, A., Fasoli, A., Furno, I., Labit, B., Podestà, M., Poli, F. M. and Ricci, P. 2008 The role of the density gradient on intermittent cross-field transport events in a simple magnetized toroidal plasma. Phys. Plasmas 15 (4), 042303.CrossRefGoogle Scholar
Theiler, C., Furno, I., Fasoli, A., Ricci, P., Labit, B. and Iraji, D. 2011a Blob motion and control in simple magnetized plasmasa. Phys. Plasmas 18 (5), 055901.CrossRefGoogle Scholar
Theiler, C., Furno, I., Kuenlin, A., Marmillod, Ph. and Fasoli, A. 2011b Practical solutions for reliable triple probe measurements in magnetized plasmas. Rev. Sci. Instrum. 82 (1), 013504.CrossRefGoogle ScholarPubMed
Theiler, C., Furno, I., Loizu, J. and Fasoli, A. 2012a Convective cells and blob control in a simple magnetized plasma. Phys. Rev. Lett. 108, 065005.CrossRefGoogle Scholar
Theiler, C., Loizu, J., Furno, I., Fasoli, A. and Ricci, P. 2012b Properties of convective cells generated in magnetized toroidal plasmas. Phys. Plasmas 19 (8), 082304.CrossRefGoogle Scholar
Theiler, C.et al. 2009 Cross-field motion of plasma blobs in an open magnetic field line configuration. Phys. Rev. Lett. 103 (6), 065001.CrossRefGoogle Scholar