Observation of inward transport flux accompanied with the long-lived mode during the L-H transition in the HL-2A tokamak

摘要: The inward transport flux accompanied by the long-lived mode (LLM) has been observed edge Langmuir probe array during L-H transition in HL-2A tokamak. cross phase between poloidal electric field fluctuation and electron density LLM frequency changed greatly transition, which led to radial change its direction a given region near pedestal barrier. By using long distance correlation method, shift of proved be key reason, cross-phase term frequency. Furthermore, shear effect mode-selecting characteristic on turbulence because turbulent still remains radially outward H-mode. In addition, when conducted heat occurs, temperature both have positive gradient frequency; this may indicate that velocity play an important role entire process.