The calculation of optical properties of cesium plasma under conditions of a pulse-periodic discharge

The calculations of the radiation spectrum, the color rendering index R _a , the color temperature T _c , and the color coordinates X _c and Y _c of cesium plasma radiation under the conditions characteristic for a pulse-periodic discharge in cesium are presented. The plasma pressure range of 30–1500 Torr and the range of temperatures on the axis of 3200–6000 K are considered. The color rendering index is shown to be R _a > 90 in the entire analyzed plasma parameter ranges. The color temperature of plasma radiation varies within a broad range of 2300–5500 K. The color coordinates of the cesium plasma radiation are close to the X _c and Y _c coordinates of a black body.     

Dynamics of the spatial structure of pulsed discharges in dense gases in point cathode−plane anode gaps and their erosion effect on the plane electrode surface

The dynamics of the spatial structure of the plasma of pulsed discharges in air and nitrogen in a nonuniform electric field and their erosion effect on the plane anode surface were studied experimentally. It is established that, at a nanosecond front of the voltage pulse, a diffuse discharge forms in the point cathode–plane anode gap due to the ionization wave propagating from the cathode. As the gap length decreases, the diffuse discharge transforms into a spark. A bright spot on the anode appears during the diffuse discharge, while the spark channel forms in the later discharge stage. The microstructure of autographs of anode spots and spark channels in discharges with durations of several nanoseconds is revealed. The autographs consist of up to 100 and more microcraters 5–100 μm in diameter. It is shown that, due to the short duration of the voltage pulse, a diffuse discharge can be implemented, several pulses of which do not produce appreciable erosion on the plane anode or the soot coating deposited on it.