Influence of a Secondary Plasma Cloud on the Ablation of Pellets in Magnetic Confinement Devices

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Abstract

The analysis of experimental data on the structure of hydrocarbon pellet clouds on the LHD stellarator has allowed one to estimate the relative contributions of neutral and plasma shielding at the ablation of macroparticles (pellets) in a high-temperature magnetized toroidal plasma. A method for the self-consistent calculation of the pellet ablation rate, the characteristic size of the pellet cloud, and the electron density in its singly ionized part including neutral gas and plasma shielding is described. This calculation for polystyrene pellets injected into the LHD plasma gives the results that agree with the experimental data obtained during the early ablation phase, when the ablation rate is determined by thermal electrons and the contribution of the superthermal component of the hot plasma to ablation can be neglected.

About the authors

O. A. Bakhareva

Peter the Great St. Petersburg Polytechnic University

Email: o.bakhareva@spbstu.ru
195251, St. Petersburg, Russia

V. Yu. Sergeev

Peter the Great St. Petersburg Polytechnic University

Email: o.bakhareva@spbstu.ru
195251, St. Petersburg, Russia

I. A. Sharov

Peter the Great St. Petersburg Polytechnic University

Author for correspondence.
Email: o.bakhareva@spbstu.ru
195251, St. Petersburg, Russia

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