Plasma temperature measurements using black-body radiation from spectral lines emitted by a capillary discharge

Gregory John Tallents, Sarah Arabella Wilson, Erik Wagenaars, Joseph Francis Branson, Tim Page

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Optically thick spectral line emssion from plasmas is often difficult to use for the diagnosis of plasma parameters. We demonstrate a technique for temperature measurement using the peak intensity of optically thick lines as their intensities approach a black-body distribution. Recording optical emission in the wavelength range 300 - 1000 nm from a plasma formed by radio-frequency heating and electrical discharges in a 0.2 m long capillary plasma, we show that the high wavelength Rayleigh-Jeans form of the black-body emission can be fitted to the most intense spectral lines to give a measurement of plasma temperatures in the 1 - 1.5 eV range. The temperature measurement technique should have wider applicability in diagnosing plasmas with optically thick spectral lines.
Original languageEnglish
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
Early online date6 Sept 2018
Publication statusE-pub ahead of print - 6 Sept 2018

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