Centre de Recherches en Physique des Plasmas EPFL, Association Euratom-Fédération Suisse, Lausanne, Switzerland S. Coda, 23 rd IAEA Fusion Energy Conference, OV/5-2, Daejeon, 13 October 2010 Progress and scientific results in the TCV tokamak for the TCV team* S. Coda *including collaborating institutions: IPP, Czech Republic ENEA-CNR Padova, Italy EHU, Spain CEA, France ENEA-CNR Milan, Italy CCFE Culham, UK IPP Garching, Germany ITER-JCT U. Warwick, UK IPP Greifswald, Germany NIFS, Japan LLNL, US F-Z Jülich, Germany IST, Portugal PSFC MIT, US KFKI, Hungary RRC Kurchatov, RF General Atomics, S. Coda, 23 rd IAEA Fusion Energy Conference, OV/5-2, Daejeon, 13 October 2010
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Progress and scientific results in the TCV tokamak
Progress and scientific results in the TCV tokamak. S. Coda. for the TCV team*. * including collaborating institutions:. S. Coda, 23 rd IAEA Fusion Energy Conference, OV/5-2, Daejeon , 13 October 2010. Outline. TCV parameters and capabilities Scientific mission and guidelines - PowerPoint PPT Presentation
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Centre de Recherches en Physique des PlasmasEPFL, Association Euratom-Fédération Suisse, Lausanne,
Switzerland
S. Coda, 23rd IAEA Fusion Energy Conference, OV/5-2, Daejeon, 13 October 2010
• vf varies most at edge where asymmetry is greatest
Bdrif
t
Bq
• Direction of radial fluxshould reverse withBf sign, Ip sign, up-down flip
• All reversals have been confirmed by experiment
S. Coda, 23rd IAEA Fusion Energy Conference, OV/5-2, Daejeon, 13 October 2010Progress and scientific results in TCV
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• observed systematically in TCV L-modes (no torque)
• at low to moderate current (qedge >3),vf is counter-current in core
• central rotation is limited by sawtooth crashes imparting a co-current spin
• vf changes sign at high current and density
Spontaneous plasma rotation
A. Fasoli, IAEA 2008 overview
New experiments performed to quantify and document effect of sawteeth
(i.e., 1/1 internal kink) and other MHD modes study effect of ECRH on rotation
A. Bortolon et al, PRL 2006B.P. Duval et al, PPCF 2007B.P. Duval et al, PoP 2008
S. Coda, 23rd IAEA Fusion Energy Conference, OV/5-2, Daejeon, 13 October 2010Progress and scientific results in TCV
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• Reproducible co-current spin-up inside the inversion radius
• Rapid relaxation (in <15% of sawtooth period)• Enhanced CXRS time resolution by coherent
averaging over multiple sawteeth
Plasma spin-up at sawtooth crash
B.P. Duval et al, EXC/P4-01 (this afternoon)
Inv. radius
S. Coda, 23rd IAEA Fusion Energy Conference, OV/5-2, Daejeon, 13 October 2010Progress and scientific results in TCV
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Slightly hollow inside the mixing radius......to the point of changing sign at high enough current
Average effect of sawteeth on rotationSelf-similar gradients outside the mixing radius
S. Coda, 23rd IAEA Fusion Energy Conference, OV/5-2, Daejeon, 13 October 2010Progress and scientific results in TCV
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Influencing rotation with ECRHthrough sawteeth
• EC power inside mixing radius hollows out vf profile
• Similar to Ip increase: consistent with effectof current profile peaking on sawteeth
O. Sauter et al,EXS/P2-17
S. Coda, 23rd IAEA Fusion Energy Conference, OV/5-2, Daejeon, 13 October 2010Progress and scientific results in TCV
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• TCV parameters and capabilities• Scientific mission and guidelines• Technical progress• Scientific highlights
Torque-free generation and transport of rotation
Particle and energy transport, turbulence Advanced real-time control Alternative confinement topologies
• Summary and outlook
Outline
S. Coda, 23rd IAEA Fusion Energy Conference, OV/5-2, Daejeon, 13 October 2010Progress and scientific results in TCV
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Stronger flattening by sawteeth for impuritiesStronger peaking for impurities than for electronsSawteeth affect particle transportsimilarly to momentum transport
Electrons Carbon ions
Similar edge gradients
Y. Martin et al, EXC/P8-13 (Friday afternoon)
S. Coda, 23rd IAEA Fusion Energy Conference, OV/5-2, Daejeon, 13 October 2010Progress and scientific results in TCV
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The effect of shape on turbulence• Triangularity strongly influences transport:
confinement of EC-heated d=-0.4 plasmas is up to twice as good as for d=+0.4 (for similar profiles)
• Gyrokinetic simulations explain this through the effect of toroidal precessional drift of trapped electrons on TEM turbulence
A. Fasoli, IAEA 2008 overview
Y. Camenen et al, NF 2007A. Marinoni et al, PPCF 2009
S. Coda, 23rd IAEA Fusion Energy Conference, OV/5-2, Daejeon, 13 October 2010Progress and scientific results in TCV
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The effect of shape on turbulence• Measurements of temperature fluctuations by
a tunable 2-channel correlation ECE system reveal a broadband spectrum in the expected 20-150 kHz range
S. Coda, 23rd IAEA Fusion Energy Conference, OV/5-2, Daejeon, 13 October 2010Progress and scientific results in TCV
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Longer correlation length at d>0larger random-walk step, consistent with more
transport
B. Labit et al, EXC/P8-08 (Friday afternoon)
S. Coda, 23rd IAEA Fusion Energy Conference, OV/5-2, Daejeon, 13 October 2010Progress and scientific results in TCV
20
• TCV parameters and capabilities• Scientific mission and guidelines• Technical progress• Scientific highlights
Torque-free generation and transport of rotation
Particle and energy transport, turbulence Advanced real-time control Alternative confinement topologies
• Summary and outlook
Outline
S. Coda, 23rd IAEA Fusion Energy Conference, OV/5-2, Daejeon, 13 October 2010Progress and scientific results in TCV
21
Real-time control in TCV• All algorithms developed in powerful and
intuitive Simulink environment• Real-time nodes generate C code
automatically from Simulink
S. Coda, 23rd IAEA Fusion Energy Conference, OV/5-2, Daejeon, 13 October 2010Progress and scientific results in TCV