کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5428106 | 1508661 | 2015 | 8 صفحه PDF | دانلود رایگان |
- Separation between peaks of Hβ line proposed for electron density diagnostics.
- Derived formulas for peak separations versus electron density.
- Formulas tested in high electron density low pressure pulsed arc.
- Applications of formulas in optically thick plasmas proven.
- Method for hydrogen Balmer beta line self-absorption testing proposed.
We propose a diagnostic technique for the measurement of plasma electron number density, Ne, based on the wavelength separation between peaks, ÎλPS, of hydrogen Balmer beta line, Hβ. In favor of the proposed diagnostic technique we demonstrate high sensitivity of ÎλPS on Ne and low sensitivity on plasma elementary processes and plasma parameters that may distort the line profile. These properties of ÎλPS enable reliable Ne plasma diagnostics in the presence of considerable self-absorption. On the basis of available theoretical data tables for the Hβ line profiles, simple Ne=f(ÎλPS) formulas are proposed. Their validity is experimentally confirmed in a low initial pressure pulsed discharge for the Ne range of (0.2-7)â1023 mâ3. The agreement of the proposed formulas with another diagnostic technique is well within 10%. In addition, the difference in Ne values obtained from peak separation and from the Hβ line width is successfully used as a self-absorption test for line profile.
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 154, March 2015, Pages 1-8