Study of particle transport during application of resonant magnetic perturbations in the J-TEXT tokamak*

In the J-TEXT tokamak, electron density pump-out is frequently observed during the application of resonant magnetic perturbations (RMPs). It is found that the applied RMPs cause obvious density pump-out in plasma core, while the edge plasma density changes little. In order to study the density pump-out caused by RMPs, the direct perturbed particle transport measurements are carried out during the application of RMPs in J-TEXT ohmic plasmas. It is found that, compared to the case without application of RMPs, the applied RMPs substantially decrease the pinch velocity V and increase the diffusion coefficient D. Stronger amplitude of applied RMPs results in more obvious change in both the transport coefficients.