ELM-averaged power exhaust on JET

摘要: This paper describes experiments performed on JET over the past two years dedicated to characterizing ELM-averaged power exhaust (based time-averaged divertor deposition profiles), with an emphasis unfuelled, Type-I ELMy H-mode. Radial energy transport in scrape-off layer (SOL) is found behave differently ion and electron channels: former dominated by (neo-)classical conduction, i.e. diffusion of heat due ion-ion collisions, while latter appears be governed turbulent convection, most likely driven MHD interchange and/or drift-Alfven instabilities. Comparison forward reversed field indicates that classical drifts can explain observed in-out poloidal asymmetry loads deposited divertor. Whereas role ELMs needs further characterization, a coherent picture formed considering collisional highly dissipative SOL turbulence.