Abstract
Perturbative particle transport experiment has been performed in the HL-2A tokamak by using supersonic molecular beam injection (SMBI) as an external particle source. The spatiotemporal evolution of edge density perturbation is traced and the particle source and the flux-gradient relation are obtained experimentally. The flux-gradient relation is found to be far from the diffusive model and three different transport processes are revealed, including pinch-dominant process, diffusion-pinch process and intermittent decays.
Highlights
For the realization of magnetic fusion reactor, achievement of dense core plasma is necessary [1]
To confirm the non-diffusive nature of particle transport associated with the turbulent pinch, perturbative particle transport experiment has been performed in the HL-2A tokamak with supersonic molecular beam injection (SMBI), and microwave reflectometers [12] are used as the main diagnostic system to study particle transport
It is clear that the edge density rapidly responses to SMBI fueling and is strongly modulated
Summary
For the realization of magnetic fusion reactor, achievement of dense core plasma is necessary [1]. It was found to be difficult to explain radial density profile by diffusive transport models [2, 3]. A turbulent pinch is proposed to explain the profile peaking without central fueling [4]. Perturbative method has been proved to be one of the most effective ways to study particle transport in plasma. I.e. diffusivity and convection velocity are determined [6, 7, 8], and some progress on transport barriers and transport mechanism has been achieved [9, 10, 11]. To confirm the non-diffusive nature of particle transport associated with the turbulent pinch, perturbative particle transport experiment has been performed in the HL-2A tokamak with supersonic molecular beam injection (SMBI), and microwave reflectometers [12] are used as the main diagnostic system to study particle transport
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