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We apply laser absorption spectroscopy to direct-current hollow-cathode helium plasma generated in a 0.3mm-diameter cylindrical hole at gas pressures of 10 80 kPa. The measured transitions are 23S-23P and 21P-31D. We evaluate the helium metastable 23S density and gas temperature using the former transition and the 21P atom density and electric field strength from the latter one. The observed lateral distributions of the 23S and 21P atom densities depend on the gas pressure, which results from the sheath length estimated based on the spatial distribution of the evaluated electric field strength.

plasma and fusion research

Spatially Resolved Measurements of Metastable Atom Density and Electric Field Strength in a Microhollow Cathode Helium Plasma by Laser Absorption Spectroscopy