Experimental analysis shows measured boron density profiles in plasma using charge exchange spectroscopy, indicating meaningful findings for plasma behavior.
A boron charge exchange spectroscopy system has been applied to measure the radial profiles of absolute boron density. The in situ calibration of charge exchange spectroscopy was performed using the boron pellet in a Large Helical Device. The calibration factor was derived by comparing the increment of boron density measured with a charge exchange spectroscopy system by the increment of electron density measured with a YAG Thomson scattering system. The radial profiles of absolute boron density are derived for the plasma using boron pellets, tracer-encapsulated solid pellets (TESPEL), and boron impurity power drops (IPD). By using boron pellets, TESPEL, and IPD, the boron concentration (nB/ne) was controlled in the wide range from 4% to 17%. The radial profiles of boron are peaked in the core for the boron pellet and TESPEL discharge, while they are slightly hollow for the boron IPD plasma.
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Yoshinuma et al. (2025) studied this question.
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