Plasma simulator on distributed computers and its application to microplasma studies

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In this research project, we have studied and developed a plasma simulator for microplasma simulations. In addition, we have tried to understand microplasma physics and to find a microplasma control method in the following research areas. We have also studied on laser particle acceleration, inertial fusion plasma confinement, radiation generation by laser produced plasma, etc by the microplasma simulator. By using the microplasma simulator users can perform simulations through a WEB browser on distributed computers. Without knowing detail information of the distributed computers users can submit their jobs and can retrieve results through the microplasma simulator. In the microplasma simulator an electromagnetic particle-in-cell code, a fluid code and a Vlasov code were also developed. In the laser electron acceleration a TEM (1,0)+(0,1) mode laser is employed to produce high-density short-pulse (atto second) electron beam. The pre-accelerated electors are trapped in transverse and compressed in longitudinal by the TEM (1,0)+(0,1) mode laser. An intense short pulse laser is employed to produce a collimated proton beam; in this study the intense short pulse laser illuminates a thin aluminum foil, which has many holes at the rear side of the foil target. By the tailored hole target a collimated proton beam was successfully produced. We have also proposed a new control method of laser-produced proton beam energy spectrum by employing an additional cover layer. The laser-produced collimated ion beam can be used for ion cancer therapy, material processing, etc. In a discharge study under water we found a photoionization is essentially important. A mm-radius microplasma jet was also produced for a fine material processing. We have also succeeded to produce a THz radiation by using a laser-illuminated transparent semiconductor.