2D PIC modeling of the helical scrape-off layer current driven by hybrid divertor biased targets in tokamak plasmas

2D PIC modeling of the helical scrape-off layer current driven by hybrid divertor biased targets in tokamak plasmas

Blog Article

The heat flux control of the divertor plate via strike-point splitting retail-packaged generated by biased targets was proposed in the HL-2A tokamak (Cui et al 2021 Fusion Eng.Des.173 112963).To understand the helical scrape-off layer (SOL) currents driven by hybrid biasing, two SOL current models (model A and B) are employed.

Model A is a simplified 2D model that focuses on investigating the effect of biasing on the sheath and elucidating the fundamental physical mechanism of bias-driven SOL current paths.The potential, charge density, electric field and current densities are calculated.Model B takes into account the actual tokamak geometry and computes the resonant magnetic perturbations (RMPs) generated Electronic Speed Controllers by bias-driven linear decay currents.Additionally, strike-point splitting is observed in the HL-2A tokamak, indicating that the SOL currents generated by hybrid biasing are capable of generating strong RMPs and consequently influence the magnetic topology.

These results confirm the potential of heat/particle flux control by hybrid divertor biased targets.