Measurement on the excitation temperature of argon plasma jet under strong magnetic field

Abstract

An experimental study was conducted to examine the effect of strong magnetic field on the excitation temperature for an argon plasma jet. In particular, the validity of the temperature determination was studied in the present paper since the temperature measurement should play the most important role in the study of the plasma behavior under the strong magnetic field. The strong field was applied to the jet by using the superconducting magnet. The emission spectra were measured at vertical positions to determine the excitation temperature of the jet. It was indicated that the temperature around the central portion of the jet increases with the strength of magnetic field. It was also shown that the temperature drop toward the outer edge of the jet becomes large as the field strength increases. The temperature was mainly determined from the scan of the spectral lines within the range of 564–623 nm. To verify the present temperature measurement, it was compared with the temperature obtained from the scan of the emission in the different spectral range. The results from the different wavelength region are in good agreement to data in the case of 564–623 nm.