Chirping is welcome in birds but not in fusion devices--scientists show that weak turbulence makes chirping more likely

Birds do it and so do doughnut-shaped fusion facilities called "tokamaks." But tokamak chirping-- a rapidly changing frequency wave that can be far above what the human ear can detect--is hardly welcome to researchers who seek to bring the fusion that powers the sun and stars to Earth. Such chirping signals a loss of heat that can slow fusion reactions, a loss that has long puzzled scientists.