Alternatively electrothermal vaporization or using helium gas can avoid these interference problems. VASIMR is a type of electrothermal plasma thruster/electrothermal magnetoplasma thruster. In MHD generators, the specific kind of magnetized ionization instability is called the electrothermal instability. Finally, electrometallurgy generally involves electrolytic or electrothermal processing. The atomizers most commonly used nowadays are (spectroscopic) flames and electrothermal (graphite tube) atomizers. The atomizers most commonly used nowadays are flames and electrothermal (graphite tube) atomizers. Comet is a launch-safe electrothermal propulsion system designed for orbit raising, life extension, and de-orbit. The electrothermal instability occurs extremely quickly, in a few microseconds. Electrothermal drill designs date back to the 1940s.