Effects of discharge current and voltage on the high density of metastable helium atoms
Feng Xian-Ping (冯贤平)a, D Andruczykb, B W Jamesb, K Takiyamac, S Nambac, T Odad
a Department of Physics, Donghua University, Shanghai 200051, China; b School of Physics, University of Sydney, NSW 2006, Australia; c Graduate School of Engineering, Hiroshima University, Hiroshima 739-8527, Japan; d Faculty of Engineering, Hiroshima Kokusai Gakuin University, Hiroshima 739-0321, Japan
Abstract Both hollow-cathode and Penning-type discharges were adopted to excite helium atoms to a metastable state. Experimental data indicate that Penning discharge is more suitable for generating high fractions of metastables in a low-density helium beam for laser-induced fluorescence technique in measuring electric fields at the edge of a plasma. The metastable density increases with increasing helium gas pressure in the range of 1.33×10-2－66.7Pa. The highest metastable density of 3.8×1016m-3 is observed at a static gas pressure of 66.7Pa. An approximately linear relationship between the density of metastable helium atoms and the plasma discharge current is observed. Magnetic field plays a very important role in producing a high density of metastable atoms in Penning discharge.
Received: 19 May 2002
Revised: 03 January 2003
Accepted manuscript online:
(Emission, absorption, and scattering of electromagnetic radiation ?)
Fund: Project supported by the Australian Research Council, Donghua University and Shanghai Science and Technological Research Council (Grant No 0252nm110).
Cite this article:
Feng Xian-Ping (冯贤平), D Andruczyk, B W James, K Takiyama, S Namba, T Oda Effects of discharge current and voltage on the high density of metastable helium atoms 2003 Chinese Physics 12 495
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