A5103246179- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Fusion materials and technologies
- Plasma Diagnostics and Applications
- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Radiation Detection and Scintillator Technologies
- Viral Infections and Vectors
- Particle Detector Development and Performance
- Geophysics and Gravity Measurements
- Superconducting Materials and Applications
- Solar and Space Plasma Dynamics
- Atomic and Subatomic Physics Research
- Geomagnetism and Paleomagnetism Studies
- Nuclear Physics and Applications
- Particle accelerators and beam dynamics
École Polytechnique Fédérale de Lausanne
2018-2025
ITER
2024
National Agency for New Technologies, Energy and Sustainable Economic Development
2018
Novel power exhaust solutions are being developed to address the challenge of integrating a high performance fusion core plasma with well-protected divertor, if single null configuration does not scale reactor device. This work aims elucidate physics mechanisms responsible for reduction in peak target heat flux configurations multiple X-points. Experimental studies on tokamak à variable Snowflake Minus extended novel three nearby divertor X-points, termed Jellyfish, allowing us enhance...
Abstract Tokamak à configuration variable (TCV), recently celebrating 30 years of near-continual operation, continues in its missions to advance outstanding key physics and operational scenario issues for ITER the design future power plants such as DEMO. The main machine heating systems changes are first described. Then follow five sections: plasma scenarios. Base-Line (IBL) discharges, triangularity studies together with X3 N2 seeding. Edge localised mode suppression, a high radiation...
Abstract A phase-modulated dispersion interferometer combined with a polarimeter is currently being designed in ITER. This diagnostic, called DIP (Density Interferometer Polarimeter), aims at performing reliable line-averaged electron density ( n e ) measurements time resolution of 1 ms and an accuracy 10% during ramp up/down phases, 2% flat-top, serving as complementary system for ITER's main the TIP (Toroidal Interferometer/Polarimeter). based on CO 2 laser λ = 9.6 μm). It inherently...
Abstract A systematic study of the power threshold for L-H transition has been conducted in TCV. Only results from NB heated plasmas are reported. The dependencies PLH on plasma current, density and main ion species have investigated. For Deuterium
plasmas at low q95, dependence is well described by ITPA scaling law. Nevertheless larger q95 values (reduced current constant toroidal magnetic field), deviates significantly law increases with q95. As a consequence, strong correlation...
Characterization and calibration measurements of two Cherenkov probes have been performed in ENEA Frascati's laboratories. Different kinds radiation used, from visible light to x-rays, order evaluate possible spurious responses the probes. Moreover, a preliminary is presented, as well first evaluation minimum single probe's detectable flux through an electron beam 2.3 MeV. Additional results obtained thanks spectrometry analysis, which gave deeper insights phenomena occurring inside In...
Fast-particle driven Alfvén Eigenmodes have been observed in low-collisionality discharges with off-axis neutral beam injection (NBI), electron cyclotron resonance heating (ECRH) and a reduced toroidal magnetic field. During NBI ECRH, toroidicity induced (TAEs) appear frequency bands close to 200 kHz energetic-particle-induced geodesic acoustic modes (EGAMs) are at about 40 80 kHz. When turning off ECRH the experiment, those beam-driven disappear which can be explained by modification of...
Abstract The effects of different working gases on the transition from linear ohmic confinement (LOC) regime to saturated (SOC) and its relation intrinsic toroidal rotation reversal phenomenon were explored in TCV tokamak. energy saturation was studied across D, H He density ramps, a range ECRH injection power through variations plasma current. occurrence reversal, concomitantly with LOC–SOC transition, observed only for certain cases, making us formally exclude causal between two phenomena....
Abstract Carbon impurity transport is studied in the TCV tokamak using a charge exchange recombination diagnostic. TCVs flexible shaping capabilities were exploited to extend previous studies negative triangularity ( δ < 0). A practical way of studying light (like C, main species due graphite tiled walls) investigate correlations between ion gradients that, this study, highlighted significant differences positive (PT) and (NT) plasma configurations. scans <mml:math...
Polarimetric Thomson scattering (PTS) is a technique that allows for accurate measurements of electron temperature (Te) in very hot plasmas (Te > 10 keV, condition expected to be regularly achieved ITER). Under such conditions, the spectral region spanned by TS spectrum large and extends low wavelengths, where transmission collection optics decreases, available detectors are less efficient, high level plasma background light perturbs measurements. This work presents recent developments...