X-RAY SPECTROSCOPY ON TOKAMAKS.

During the last decade the X-ray spectroscopy of high temperature plasmas has witnessed a rapid development. Most of the impulses have come from astrophysics, in particluar, from the research on solar flares. On the other hand, the attainment of well-diagnosed, high-temperature laboratory plasmas in laser-pellet implosions and in tokamaks, has precipitated a fertile exchange between theory and experiment. Agreement and very detailed understanding has been reached for a great number of spectra with the result that X-ray spectroscopy represents today a powerful and reliable new plasma diagnostic with important applications for fusion plasmas as well as solar flares. The authors provide a short review of the experimental results from tokamaks.