Journal of Applied Physics
Fusion experiments like ITER rely on spectroscopic diagnostics to extract information from the Plasma in the reaction chamber.
Researchers worldwide are currently working on making ITER operational alongside testing subcomponents of the experiment. Here researchers from India use the doppler shift to diagnose a particle beam. They use optical fibers to probe the emission signal from different parts of their experiment and align them along the entrance slit of their spectrograph to detect the signals simultaneously on a CCD camera.