Absolute measurements of characteristics of tantalum ion current from laser-produced plasma
1998
The work presents results of absolute measurements of the energy distribution of ions, the ion current density, and the number of ions emitted from a tantalum laser-produced plasma. The results were obtained using two types of calibrated windowless electron multipliers. The number of ions with the individual charge state in the range z=37–42 was about 2.5×108 ions/cm2 and the maximum ion current density was about 0.5 mA/cm2 at the distance of 174 cm from the target. Moreover, the ion signals, the one measured by means of an ion collector and that reconstructed on the basis of measurements performed with an electrostatic ion energy analyzer, are also compared as well the influence of the secondary electron emission effect on the ion collector signal applied in the experiment is estimated.
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