Abstract
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-α emission (Hα) 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 Hα emission near the bias plate has been clearly observed. The same time trend on Hα intensities measured by the imaging diagnostic and the optical emission spectroscopy is confirmed.
Highlights
A spectrally-selective imaging system has been developed and installed in the arc discharge type negative hydrogen ion (H−) source in the National Institute for Fusion Science (NIFS)1,2. This system has been well performed to visualize a reduction in the distribution of hydrogen Balmer-α emission (Hα) owing to H− ions; these findings have contributed to the high performance and safety operation for a neutral beam injector (NBI) in the Large Helical Device (LHD)
We present a configuration of a spectrally-selective imaging system based on a GigE vision camera for the ELISE RF hydrogen negative ion a)Contributed paper published as part of the Proceedings of the 16th International Conference on Ion Source, New York, USA, August, 2015
We find sudden signal reduction on Hα emission during beam extraction in both measurement
Summary
A spectrally-selective imaging system has been developed and installed in the arc discharge type negative hydrogen ion (H−) source in the National Institute for Fusion Science (NIFS). A spectrally-selective imaging system has been developed and installed in the arc discharge type negative hydrogen ion (H−) source in the National Institute for Fusion Science (NIFS)1,2 This system has been well performed to visualize a reduction in the distribution of hydrogen Balmer-α emission (Hα) owing to H− ions; these findings have contributed to the high performance and safety operation for a neutral beam injector (NBI) in the Large Helical Device (LHD). We present a configuration of a spectrally-selective imaging system based on a GigE vision camera for the ELISE RF hydrogen negative ion a)Contributed paper published as part of the Proceedings of the 16th International Conference on Ion Source, New York, USA, August, 2015. We will show the distribution image of Hα emission close to the bias plate surface in the typical RF discharge
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