Installation Of Spectrally Selective Imaging System In Rf Negative Ion Source

A spectrally selective imaging system has been installed in the RF negative ion source in the International Thermonuclear Experimental Reactor-relevant negative ion beam test facility ELISE (Extraction from a Large Ion Source Experiment) to investigate distribution of hydrogen Balmer-alpha emission (H-alpha) close to the production surface of hydrogen negative ion. We selected a GigE vision camera coupled with an optical band-path filter, which can be controlled remotely using high speed network connection. A distribution of H-alpha emission near the bias plate has been clearly observed. The same time trend on H-alpha intensities measured by the imaging diagnostic and the optical emission spectroscopy is confirmed. (C) 2015 AIP Publishing LLC.