The Energy Balance of Plasma in a Coaxial Plasma Opening Switch

摘要

The two-dimensional energy balance in a coaxial plasma opening switch (POS) isstudied based on the single-fluid magnetohydrodynamic (MHD) equations coupled with the gener-alized Ohm's law.The energy transfers between the plasma and the magnetic field are consideredduring the penetration of the magnetic field as the Ohmic heating is included in the energy-balanceequation.The focus is on the energy partition between the magnetic-field energy and the dissi-pated magnetic-field energy in a high-density POS with different rise-in-time electric currents atthe generator boundary.The simulation code is tested in two cases:the constant-in-time cur-rent case and the linear rise-in-time current case.For the sinusoidally rise-in-time current similarto that of the experiments,it is shown that at the end of the conduction phase the dissipatedmagnetic-field energy is 36.5% of the input electromagnetic energy,which is consistent with theexperimental results.