Gas Puff Imaging Diagnostic on HL-2A Tokamak

A new Gas Puff Imaging (GPI) diagnostic has been developed and put into experimental research on HL-2A tokamak to study plasma turbulence and transport dynamics in the edge and Scrape-Off Layer (SOL). Here we will present some results from the recent 2018 Experimental Campaign. The statistic characteristics of blob w/wo Resonant Magnetic Perturbation (RMP), including burst rate, mean lifetime and velocities in different areas, are compared. During the application of RMP, the shear layer of poloidal velocity (V_θ) was found shifting inwards and the V_θ increasing in SOL and breaking down inside LCFS. Also, Electron Cyclotron Resonance Heating (ECRH) was found having a similar effect on V_θ in SOL and the edge area. Besides, we also observed two different kinds of turbulence with different frequencies moving inwards and outwards the LCFS.