Interaction of a Powerful Hydrogen Plasma Flow with a Supersonic Gas Jet and a Tungsten Target

The results of a study of the interaction of a powerful flow of hydrogen plasma with a supersonic gas jet in front of a tungsten target are presented. Nitrogen or neon injected in front of the target surface provides a reliable method of shielding tungsten from direct exposure to hydrogen plasma. It has been experimentally shown that the resulting plasma of the gas jet is a powerful source of short-wave line radiation. Energy density absorbed by a tungsten target approximate to 25 J/cm(2) is half the energy absorbed by tungsten during pulsed action of a hydrogen plasma flow without a gas jet approximate to 50 J/cm(2). The maximum temperature achieved by the tungsten surface is approximate to 3700 K with the use of a gas jet and approximate to 5800 K without a gas jet. The presence of a gas jet-screen in front of the tungsten leads to the localization of evaporated tungsten near the target at distances of up to 1 cm from the surface.