Therefore rjrri3max is shown as the total conversion efficiency for the PDC in the future. The t?r?/3max increases with the laser energy using the carbon target as shown in Fig. 7. But when the cross-linked polyethylene target is used, increases with the laser energy at first and reaches maximum and secondly it decreases with the laser energy. The laser energy is expected to be larger for the practical use in the future, so the properties of the carbon target used are desirable because rh'^hmax increases with the laser energy. Next the properties of the cross-linked polyethylene target which has the maximum value for t]i-t]3max are discussed. Fig. 9 shows the dependance of r/] on the laser energy. The of the cross-linked polyethylene is smaller than that of the carbon and each of the two increases with the laser energy. Therefore it is considered that the properties of rh~r]3max using crosslinked polyethylene which has the maximum is due to the properties of r]3. So the conversion efficiency r]3 is considered. In the PDC the suppressor grid separates the incident ions and electrons on the PDC electrostatically and only the kinetic energy of the ions is converted to electricity. The interval of the mesh of the suppressor grid should be very much smaller than the Debye length of the plasma to separate the ions and electrons electrostatically. Therefore the interval of the mesh I and the Debye length XD are compared. The interval of the mesh is Z=0.77 mm and the Debye length kD is calculated by
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