Absorption of lower hybrid waves in the scrape off layer of a diverted tokamak

Absorption of lower hybrid waves in the scrape off layer of a diverted tokamak

The goal of the Lower Hybrid Current Drive (LHCD) system on the Alcator C-Mod tokamak is to investigate current profile control under plasma conditions relevant to future devices such as ITER and DEMO. Experimental observations of an LHCD " density limit " for C-Mod are presented in this paper. Bremsstrahlung emission from relativistic fast electrons in the core plasma drops suddenly above line...

Measurements of the parallel wavenumber of lower hybrid waves in the scrape-off layer of a high-density tokamak

Simulation of the scrape-off layer region of tokamak devices

Understanding the key processes occurring in the tokamak scrape-off layer (SOL) is becoming of the outmost importance while we enter the ITER era and we move towards the conception of future fusion reactors. By controlling the heat exhaust, by playing an important role in determining the overall plasma confinement, and by regulating the impurity level in tokamak core, the dynamics of the fusion...

Parallel transport in a tokamak scrape-off layer

G. Manfredi1, S. Hirstoaga2, S. Devaux3, E. Havlíčková4, D. Tskhakaya5 1 Institut de Physique et Chimie des Matériaux, Strasbourg, France 2 INRIA and Institut de Recherche en Mathématiques Avancées, Strasbourg, France 3 Max-Planck-Institut für Plasmaphysik, Garching, Germany 4 Culham Centre for Fusion Energy, Abingdon, United Kingdom 5 Institute for Theoretical Physics, University of Innsbruck,...

Turbulent regimes in the tokamak Scrape-Off layer

◮ We study Scrape-Off Layer (SOL) turbulence through simulations that evolve the plasma dynamics as the interplay of plasma source from the core, perpendicular transport, and losses at the limiter plates ◮ We identify the SOL turbulence regimes, defining the regions of existence of the Ballooning Modes [resistive (RBM) and inertial (IBM)] and the Drift Waves [resistive (RDW) and inertial (IDW)]...