Modélisation non-linéaire des interactions ondes/plasma de bord Enabling Research CEA-05 L. COLAS (PI), L. LU, P. Tamain, IRFM E. Faudot, S. HEURAUX,

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Presentation transcript:

Modélisation non-linéaire des interactions ondes/plasma de bord Enabling Research CEA-05 L. COLAS (PI), L. LU, P. Tamain, IRFM E. Faudot, S. HEURAUX, IJL B. DESPRES, LJLL J. Jacquot, IPP Garching A. KRIVSKA, D. Van Eester, K. Crombe, F. Louche, ERM/KMS Brussels 9MW Colloque prospective Fédération de recherche | L. COLAS 15 octobre 2015 CEA | 10 AVRIL 2012

Ion Cyclotron Range of Frequencies (ICRF) waves: the main heating method on WEST 40-60MHz; 12MW installed; up to 1000s Goal: central heating / current drive Launching: 3 phased arrays of poloidal current straps in SOL Wave coupling: how much power to the core for IRF=1A? Losses in SOL? IRF

ICRF launchers: active plasma-facing components ICRF launchers are in the SOL… ~l/10 antenna: inefficient in vacuum Coupling  minimal distance to cut-off … hence undergo Plasma-Surface Interaction (PSI) … Heat loads Erosion Impurity production Active objects Emitted RF fields  RF oscillation of sheaths DC rectification  DC self-biasing of SOL Locally enhanced PSI Where? How much? Link with antenna design, RF setting? Visible ~l/10 Important in high-Z long-pulse machine ! Infrared B0 CEA | 10 AVRIL 2012

Multi-scale modelling approach Macro-scale antenna model RF Wave excitation Current straps or RF Field map Artifical wave damping RF wave propagation & DC plasma biasing… … Coupled by RF and DC sheath Boundary Conditions at shaped wall Plasma toroidal poloidal radial wall plasma sheath Micro-scale magnetized RF sheath models Start simple Upgrade  U-Lorraine V(t)

Modular multi-physics modelling [Colas’2012] [Jacquot’2012] Excitation SSWICH Self-consistent Sheaths & Waves for Ion Cyclotron Heating RF Wave propagation FEM Iterative Solver COMSOL Start simple Upgrade: input from RF engineering RF wave physics RF Sheath physics SOL physics Applied maths Sheath RF voltage DC plasma biasing J. Jacquot et al 20th RF Top. Conf. June 27th 2013

SSWICH guides RF-sheath mitigation limiter edge limiter edge Pcentral/Pouter = 2 IRF IRF Poloidal Radial x x Compare 2 ASDEX upgrade antennas Figure of merit: DC plasma potential SSWICH excited with RAPLICASOL RF solver [Jacquot2015] Interpretation: compensation of weighted strap contributions to VRF Poloidal Radial V. Bobkov | 43rd European Physical Society Conference on Plasma Physics | Leuven, Belgium | 8 July 2016 | Page 6

SSWICH: a unique tool in Europe with many prospects WEST : challenge/opportunity for edge ICRF physics Constraint models by measurements! RF-induced W sources: need common work with SOLEDGE. Future: guide design of more optimized antennas? Other experimental opportunities Tokamaks: ASDEX-Upgrade, JET, EAST… RF sheath test beds: ALINE (Nancy) IShTAR (IPP Garching, MST2) Implemented physics remains simple: input needed RF wave physics  PhD L. LU, defense 02/12 (Nancy) RF sheath physics  IJL (U. de Lorraine-CNRS) SOL physics Applied maths  B. Després (LJLL, next talk) CEA | 10 AVRIL 2012

Spare CEA | 10 AVRIL 2012

Adaptation of SSWICH for Aline simulations y x Aline: a cylindrical plasma device for basic RF sheath studies in ULorraine [Faudot 2015] RF electrode and probe Collisional magnetized plasma Argon or Helium plasma ne : 1015-1018m-3 f : 10kHz-250MHz B0 : 0-0.1T Adapted SSWICH geometry ULorraine public defence | 2 December 2016

RF simulations Using SSWICH-FW Waves in Argon plasmas: Lower hybrid wave: low density, 1015m-3 Helicon wave: high density, 1018m-3 Propagates along magnetic field, inside a resonance cone θ=0.01o, kz=0.001 m-1 “Slow wave like”, Lower hybrid wave By SSWICH-FW “Fast wave like”, Helicon wave By SSWICH-FW ULorraine public defence | 2 December 2016

RF sheath simulations for Aline: preliminary results Exp. floating potential map from probe measurement [courtesy S. Devaux] DC plasma potential from simulation By SSWICH-SW LH wave is the main wave supported in Aline Further improvement More constraints on parameters, detailed density profile, collision frequency… Include more physics: E×B drifts, 3D effects… ULorraine public defence | 2 December 2016