Transport Properties of Optimised Shear Discharges with Elmy H-Mode In Jet

摘要

Analysis of thetransport properties of optimised Shear discharges in JEt has been carried out using the TRANSP and EFIT codes. the transition to MLMY H-mode occurs in a short time after the start ofthe main plasma heating in OS discharges with the Gas Box divertor. Internal Transport Barriers occur in the ELMY H-mode phase. Strong dependence of E*B shearing rate [1] on q at ITB location has been observed .The magnitude of ion X_i diffusivity in the plasma centre can reah the level of teh ion neoclassical diffusivity X_neo. The electron idffusivity X_e is typicaly above the level of X_i. ELMs may deterioratethe ITBs. NOble gasses puff was used to control ELMs. Tearing and 'snake'-like modes limit the plasma confinement iwth ITBs in discharges with the highest performance.