Abstract
The breakdown in helium is achieved by linear focusing of a TEA-CO2 laser beam with refractive axicon. The plasma produced is cylindrical in shape, 5 mm in diameter and 30 mm long. The plasma parameters Ne and Te as a function of time up to 20 mu s were deduced from spectroscopic measurements. From the Stark width of ionised and neutral helium lines the values of Nc were determined starting from Nc=7*1023 m-3 at 0.25 mu s after the breakdown. The time dependence of Tc was determined from the He II/He I intensity ratio and He I/continuum ratio.
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