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Статья

Electrode material transport and re-deposition in high-intensity arc discharge lamps

Vacuum. 2004. Vol. 73. No. 2. P. 155-159.
Bondarenko G.G., Fisher M. R., Kristya V. I., Prassitski V. V.

A two-dimensional model of a sintered electrode activator (in particular, barium) transport in the arc discharge lamp tube volume, based on numerical solution of the non-stationary diffusion equation, is developed. The dependence of the barium atoms flow density at the electrode rod tip on fill gas pressure and electrode dimensions is investigated. It is found that the main mechanism of their transport to the rod tip is evaporation from the sintered mass surface and diffusion through the gas. Evolution of tungsten rod emission characteristics caused by deposition of the evaporated material at its surface is experimentally studied.