ABSTRACT
To quantitatively evaluate the performance of the studied XUV laser, we undertook simplified modelling of the radiation transfer in the active medium. The model treats amplification of axial emission in an active medium which accounts for the refraction of the XUV laser beam. Results of simulations for the capillary and the cell are shown (solid lines), the normalization constant being the same for both simulations (that which gives the measured XUV laser signal from the capillary at 17 Torr). It is seen that the curve calculated for the cell agrees well with the experimental points for the 4 and 10 mm cells, and the two curves coincide for short lengths, as they should. The main discrepancy with the experimental results is that the simulated signal for the cell does not change after z = 8 mm since it is calculated that Xe8+ is not generated for values of z greater than this, whilst the measured signal for the 15 mm cell is about 2 times larger than that for the 10 mm cell. This effect can not be explained by the present modelling and might be attributed to differences in the gas densities outside the entrance and exit pinholes as the pinhole sizes are different in the two cases.
