1997 Volume 81 Issue 2 Pages 154-157
The dependence of 253. 7nm emission efficiency on the discharge tube radius in argon-mercury mixture gases is investigated by simulation for a positive column, using a constant tube wall load. The dependencies of emission efficiency on mercury vapor pressure and argon filling pressure are also investigated. The obtained results are as follows: (1) The emission efficiency has a maximum with the tube radius under constant tube wall load, mercury vapor pressure and argon filling pressure.(2) The emission efficiency has a maximum against mercury vapor pressure, and both the maximum emission efficiency and its optimum mercury vapor pressure increase with decreasing tube radius.(3) Under constant mercury vapor pressure, the emission efficiency at small radii is improved by increasing the argon filling pressure. However, it still decreases with decreasing tube radius due to the increase in elastic loss.
