What is the connection between boron, an element in a common household cleaner, and tokamaks, ring-shaped fusion facilities that heat fuel to million-degree temperatures? Scientists at the U.S. Department of Energy's (DOE) Princeton Plasma Physics Laboratory (PPPL) have conducted research showing that a PPPL-developed powder dropper can successfully drop boron powder into high-temperature plasma within tokamaks that have parts made of a heat-resistant material known as tungsten. Scientists want to confirm they can use this process to apply boron to tungsten parts because bare tungsten walls can hurt plasma performance if the plasma damages the tungsten.