M Yoshinuma, K Ida, M Goto, T Kawate, Y Kawamoto, N Tamura, S Masuzaki, H Noto, S Takayama, M Osakabe
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In situ calibration of charge exchange spectroscopy and measurements of absolute density profiles in the plasma with high boron concentration.
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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Review of Scientific Instruments, is committed to the publication of advances in scientific instruments, apparatuses, and techniques. RSI seeks to meet the needs of engineers and scientists in physics, chemistry, and the life sciences.
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