Characterization of Magnetic Turbulence in Tokamak Plasmas through Hard X-Ray Spectra

Magnetic turbulence is characterized using anomalous hard x-ray spectra in tokamaks. Two types of spectra are obtained, single slope or normal spectra, and spectra that present roughly two slopes, or anomalous spectra. For normal spectra the amplitude of the turbulence is given by the slope and a lower limit for the radial correlation length of the turbulence is deduced from the maximum detected energy. For anomalous spectra the magnetic turbulence amplitude can be again deduced from the first slope and the radial correlation length can be inferred from the energy at which the slope changes.