Plasmastralen

Plasmastralen is a term used in several languages to denote a directed stream or jet of plasma, i.e., a stream of ionized gas. In English-language plasma physics, the concept is usually described as a plasma jet, plasma beam, or plasma stream; plasmastralen may appear in regional technical literature or in popular-science contexts. A plasmastralen consists of ionized gas in which electrons and ions are present, produced when a gas is ionized and then accelerated and shaped by electric and magnetic fields. Depending on the source, the beam can be mostly ionized, partially ionized, neutralized, or carry a net electric charge.

Generation methods include arc plasmas produced by plasma torches, radio-frequency or microwave discharges, and laser-produced plasmas where material is ablated to form a rapidly expanding plume. Magnetic or electrostatic fields, nozzle geometry, and gas composition determine beam collimation, velocity, density, and temperature. Typical plasmastralen temperatures range from a few thousand to tens of thousands of kelvin, with densities and energy fluxes that depend on the source conditions.

Applications span materials processing such as cutting, welding, coating, and surface treatment; deposition of thin films; and sterilization or surface modification in medicine. In space technology, plasma beams are discussed in the context of electric propulsion concepts like ion or Hall-effect thrusters, though such devices usually produce broader exhaust plumes rather than tightly focused beams. In science fiction, plasmastralen is sometimes depicted as a controllable energy beam or weapon. Safety concerns include intense heat, ultraviolet radiation, reactive species, and strong electromagnetic fields.