Simulation of Pellet Cloud Drift with Multilevened 3D Code (M3D)

Le résumé fourni par la source

Pellets are injected into thermonuclear devices for refueling, diagnostic use, or for quenching the plasma prior to hard disruptions.A pellet injected into a hot plasma ablates at a rate defined by the balance of energy flux reaching the pellet surface.The ablated particles form a cloud around the pellet, cloud expands unimpeded as long as the particles remain un-ionized, and it is continuously heated by collisions with incident energy carriers.At some time instant ionization sets in at the cloud periphery, the ionized particles interact with the magnetic field and their motion becomes magnetically constricted.As the pellet traverse the magnetized hot plasma high-beta plasmoids are formed along the pellet path.Therefore in addition to the conventional ablation processes-dominated by neutrals, electrostatic, and plasma shielding, these plasmoids may further penetrate due to drift effects, before are stopped by magnetic forces or are disperse along field lines due to parallel dynamics.Recent experiments of high field side pellet injection, have demonstrated the grad(

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