Showing papers by "Boris Breizman published in 2018"

Force-free motion of a cold plasma during the current quench

Abstract: Cold disruptive plasma tends to move during the current quench. Its motion is essentially force-free since the current quench timescale is resistive rather than Alfvenic. In contrast to the hot vertical displacement events, the frozen-in condition is violated in the cold plasma case, and the plasma motion is not governed by magnetic flux conservation but rather by its dissipation. We present a numerical model of the cold plasma dynamics. This model predicts electromagnetic loads on the vacuum vessel, the plasma flow and density evolution, and the plasma centroid evolution. Our calculations include poloidal wall currents. We demonstrate their significant contribution to the force acting on the vacuum vessel.

A force-free motion of cold plasma during the current quench

Abstract: Cold disruptive plasma tends to move during the current quench. Its motion is essentially force-free since the current quench timescale is resistive rather than Alfvenic. In contrast to the hot vertical displacement events, the frozen-in condition is violated in the cold plasma case, and the plasma motion is not governed by magnetic flux conservation but rather by its dissipation. We present a numerical model of the cold plasma dynamics. This model predicts electromagnetic loads on the vacuum vessel, the plasma flow and density evolution, and the plasma centroid evolution. Our calculations include poloidal wall currents. We demonstrate their significant contribution to the force acting on the vacuum vessel.

MHD spectroscopy of JET plasmas with pellets via Alfvén eigenmodes

Abstract: Alfven eigenmodes (AEs) are routinely seen in present-day tokamaks and stellarators with energetic particles and they represent an attractive form of MHD spectroscopy that provides valuable informa ...