Liner Plasma Research Articles

Experimental and numerical simulation studies on time resolved structure of impurity generation and transport in NAGDIS-I

Characterization and transport of sputtered atoms are determined in the plasma environment by comparing the images taken by a ICCD camera with high sensitivity and good time resolution, and the three-dimensional atom distributions obtained by a newly developed simulation code including the energy and direction of atom ejection, atomic processes, and collisions between various kinds of particles for the liner plasma configuration. The diffusion coefficients of impurity ions obtained by the code are confirmed to be well represented by the classical theory.

Diffusion of azimuthal magnetic fields into a cylindrical plasma

Simple analytic models have been developed to describe the current density and magnetic field profiles in a cylindrically symmetric plasma carrying a z-directional current. Solutions are obtained for time varying boundary magnetic fields characteristic of imploding liner and gas puff plasma implosions. The cylindrical models are compared with previously developed planar solutions. Applications to electromagnetically imploded plasma shells show a small variation in the magnetic field profiles at early times and large radius. These variations become more pronounced as the implosion moves to smaller radius. In general, the effects of cylindrical geometry become significant only when the outer radius reaches the same order as the magnetic field gradient scale length.

Fast, large-signal, free-standing foil bolometer for measuring ultrasoft x-ray burst fluence

A fast ( approximately 300 ns), large-signal ( greater, similar1 V), free-standing foil bolometer was developed for measuring ultrasoft x-ray burst fluences. The results of bolometer measurements of the radiation output of an imploding foil liner plasma indicate yields of several tens of kJ, assuming isotropic emission. This is in substantial agreement with filtered metal photocathode (x-ray diode) measurements. The bolometer design, response function, and comparison with x-ray photodiode data are discussed. This type of bolometer is particularly applicable to radiation measurements of high-energy, destructive pulsed plasmas such as high-energy imploding liner plasmas.