LIU Yao-ze, YUAN Cheng-xun, GAO Rui-lin etc. Investigation of Electron Excitation Temperature of Helium Plasma in Coaxial Hollow Cathode Discharge[J]. Chinese Journal of Luminescence, 2016,37(10): 1299-1304
LIU Yao-ze, YUAN Cheng-xun, GAO Rui-lin etc. Investigation of Electron Excitation Temperature of Helium Plasma in Coaxial Hollow Cathode Discharge[J]. Chinese Journal of Luminescence, 2016,37(10): 1299-1304 DOI: 10.3788/fgxb20163710.1299.
Investigation of Electron Excitation Temperature of Helium Plasma in Coaxial Hollow Cathode Discharge
Low temperature helium plasma was generated using the coaxial hollow cathode configuration. In order to study the impact of the discharge power as well as the pressure of helium on the electron excitation temperature of plasma
calculation was performed based on the emission spectra data of plasma under different discharge conditions acquired by fiber optic spectrometer. The variation of electron excitation temperature was analyzed in relation to different experimental parameters. The results demonstrate that the emission spectra of low temperature helium plasma are comprised of continuum emission and the atomic spectrum of helium. The intensity of spectral lines change dramatically under different discharge conditions
although no visible shift of lines is observed. The electron excitation temperature increases almost linearly with the discharge power
rising from 5 566.4 K to 5 855.3 K
which is mainly owing to the growing acquisition of energy from the electric field. With the growth of helium pressure
the electron excitation temperature increases gradually from 5 203.7 K at 15 Pa to 5 941.3 K at 55 Pa
before decreasing slowly to 5 855.3 K at 75 Pa. This is because that the pressure will not only affect the averaged energy of the electrons gained in the electric field
but also the collision frequency between electrons and He atoms. By selecting proper discharge parameters of the coaxial hollow cathode system
the electron excitation temperature of helium plasma can be controlled.
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