In this way, the conversion efficiency is calculated by the ratio of the kinetic energy Ep given by equation (4) to the laser energy. Next, the method of measuring which is the conversion efficiency in the PDC from the incident ions' kinetic energy to the electric energy is explained. The kinetic energy of the incident ions on the PDC is measured by the Langmuir probe set at 4.7 m from the target surface. The electric energy converted by the PDC is calculated by the following equation. Where Vc and Vv are the applied voltage of each collector, Icmcm and Ivmcm are the mean value of the current each collector and tc and tr are the duration of each collector current. The conversion efficiency rj3 in the PDC is calculated by the ratio of the electric energy given by equation (5) to the energy given by equation (4) at 4.7 m from the target. 3.1.2. Experimental Results and Discussion. Fig. 7 shows the dependence of tlrthmax on the laser energy using the PDC with two collectors. The t]3 varies with the collector voltage and is maximum at the proper voltage. The total conversion efficiency from the laser energy to the electric energy is described by Where z/2 *s the ratio of the incident ions on the PDC to the expansion ions from the target and it is very small r]2 = 2.69 X 10-4 in this apparatus. If the PDC is distributed
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